LTC3528EDDB-2#TRMPBF,LTC3528EDDB-2#TRPBF, 规格书,Datasheet 资料
P3528(0.2W Q1)系列规格书-欧标
1.1
5
FM-P3528WXS-460Q-R70/R80
焊接指导
1. 手工焊接 推荐使用功率低于 20W 的烙铁，焊接时烙铁的温度必须保持在 350℃以下，且每个电极只能进行一次焊接，
每次焊接的持续时间不得超过 3 秒。人手焊接过程中的不慎操作易引起 LED 产品的损坏，应当小心谨慎。
2. 回流焊接 推荐使用以下无铅回流焊接温度图进行。
5. 外力
LED 的封装胶部分相当脆弱，请勿用坚硬、尖锐的物体刮、擦封装胶部分。直接用手拿取产品不但会污染封 装树脂表面，也可能由于静电等因素导致产品性能的改变。在用镊子夹取的时候也应当小心注意，过度的压力也 可能直接影响封装内部的管芯和金线，因此请勿对产品施加过度压力，特别当产品处于高温状态下，例如在回流 焊接过程中。
产品描述 本产品具有垂直散热结构设计，散热性能良好， 可靠性高，寿命长，同时具有高光效，高显色指 数，低功耗，大发光角度等优点，特别适用于 LED 日光灯管、球泡灯、筒灯等照明产品。
目录
电性参数............................................ 1 典型特性曲线.................................... 2 可靠性实验........................................ 3 外形尺寸............................................. 4 包装.................................................... 5 焊接指导............................................. 7 使用注意事项…………………………......... 8 分档…................................................. 10
大电流白色LED驱动器LTC3215
大电流白色LED驱动器LTC3215
于毅诚
【期刊名称】《电子世界》
【年(卷),期】2005(000)012
【摘要】LTC3215是一种低噪声、大电流电荷泵式DC/DC变换器,用于驱动大电流白色LED.该器件主要特点：根据工作条件自动改变升压模式（不升压、倍压或两倍压）;超低压差ILED电流控制;输出电流可达700mA;恒动定工作频率0.9MHz,噪声低;输入电压Vin范围为2.9～4.4V;有LED开路、短路保护;有过热保护;有关闭控制,在关闭时断开LED,其耗电典型值为2.5μA;LED的电流可设定,精度4%;启动时有软启动,限制尖脉冲电流;外围元件少;小尺寸10管脚DFN封装;工作温度范围-40～85℃.
【总页数】2页(P33-34)
【作者】于毅诚
【作者单位】无
【正文语种】中文
【中图分类】TN624
【相关文献】
1.日本开发大电流型小型化的白色LED [J], 陈云生
2.LDO白色LED驱动器TPS7510x提供超小型解决方案 [J], William Had-den
3.带自动调光功能的白色LED驱动器 [J],
4.大功率应用的集成化8位MCU——这种MCU具有大电流驱动器和高压驱动器,可用于汽车系统等多种领域 [J], 范东华
5.BD60910GU：背光用白色LED驱动器 [J],
因版权原因，仅展示原文概要，查看原文内容请购买。
华旺光电子Warm White色顶LED单片机3528型号说明书
Factory : WAH WANG OPTOELECTRONIC (SHENZHEN) CO LTD.
Specification
For 3528 Single Chip Warm White Color Top LED Part No: WW-WRA30TS-U1
260( for 5 sec)
பைடு நூலகம்
℃
Electrical Optical Characteristics at Ta=25℃
Parameter
Symbol Min. Typ. Max. Unit
Test Condition
Luminous Intensity Ref. Luminous Flux
Viewing Angle
Iv1 2100 --- 3000 mcd
Φv1
7.5
8.5
---
lm
2θ1/2 --- 120 --- Deg
IF = 20mA(Note 10) IF = 20mA IF = 20mA
Forward Voltage
VF1
2.8
---
3.4
V
IF = 20mA
Luminous Intensity
Iv2 3000 --- 4000
Symbol
Value
Unit
Power dissipation
Pd
60
mW
Continuous Forward Current
IF
20
mA
Peak Forward Current (1/10 Duty Cycle, 0.1ms Pulse Width)
led3528蓝光贴片灯珠最新规格书
3528蓝光规格书3528 BLUE SPECIFICATION 产品型号 Model NO.:HT-K3528BC版次 REV NO.:V01版文件编号Document NO.:YT-DG201303日期 DATE :2013.3.041.外形尺寸D imensions单位(Units):毫米(mm)2.光电特性Electrical / Optical characteristics1/10周期, 0.1 msec脉宽IFP Conditions : 1/10 Duty Cycle, 0.1 msec Pulse Width.½ Rja = Heat resistance from Dice to Ambient temperature (Ta) Rjs = Heat resistance from Dice to Solder temperature of Cathode Side (Ts) (3) 原始光电参数Initial Electrical/Optical Characteristics (TA=25ºC)(4)发光强度范围Luminous Intensity Ranking (TA=25ºC)允许误差± 10%Luminous Intensity Measurement allowance is ± 10%.(5)颜色范围Color Ranking (TA=25ºC)允许误差± 0.01Color Coordinates Measurement allowance is ± 0.01.3.包装PACKAGING(1)LEDS在装带之后纸箱包装. The LEDs are packed in cardboard boxes after taping.(2)装带规格Taping Specifications (单位:毫米Units:mm)(3)卷轴尺寸Reel Dimension装带数量2000个/卷2000Pcs/Reel(3) 最小包装标签注明以下:产品名称.批号.光电范围.数量.The label on the minimum packing unit shows ; Part Number, Lot Number, Ranking, Quantity.(4)请注意防水防潮Keep away from wate r, moisture in order to protect the LEDs.(5) 须采取适当防护措施,以防包装箱跌落或受到强力撞击造成对产品的损伤.The LEDS may be damaged if the boxes are dropped or receive a strong impact against them. so precautions must be taken to prevent any damage.4.可靠性RELIABILITY5.注意事项Cautions(1) 焊接条件Soldering Conditions本产品最多只可回焊两次,且在首次回焊后须冷却至室温之后方可进行第二次回焊.Number of reflow process shall be less than 2 times and cooling process to normal temperature is required between first and Second soldering process. 推荐焊接条件(Recommended soldering conditions)有铅回焊（Lead Solder ） 无铅回焊(Lead-Free Solder)推荐焊盘式样(Recommended Soldering Pattern ) 单位:毫米( Units:mm)(2)静电 Static Electricity触摸LED 时,推荐使用防静电手腕带或防静电手套.It is recommended that a wrist band or an anti-electrostatic glove be used when handling the LEDs. 所有装置、设备、机器均应接地.All devices, equipment and machinery must be properly grounded.静电损坏的LED 会显示出异常特征:正向电压变低或在低电流时死灯.标准: I F =0.5mA 时, V F > 2.0VDamaged LEDs will show some unusual characteristics such as the forward voltage becomes lower, or the LEDs do not light at the low current. Criteria : (V F > 2.0V at I F =0.5mA)(3)防潮包装Moisture Proof Package使用防潮包装It is recommended that moisture proof package be used .(4)储藏Storage打开包装袋之前,LED在温度为30°C或更低湿度70%RH以下,可保存一年.Before opening the package ,The LEDs should be kept at 30°C or less and 70%RH or less. The LEDs should be used within a year.（5）打开包装之后,应在24hrs 内焊接完毕.After opening the package, The LEDs should be soldered within 24 hours (1days) after opening the package. If unused LEDs remain, they should be stored in moisture proof packages, such as sealed containers with packages of moisture absorbent material (silica gel).下列情况发生时，须要在焊接前重新烘烤60 ± 5°C,24小时以上。
LTC2442 24位高速4通道DS ADC集成放大器的说明书
1DC979AfDescription24-Bit High Speed 4-Channel DS ADC with Integrated AmplifierThe L TC ®2442 is a 2-/4-channel, high speed, 24-bit ΔS ADC with ten selectable speed/resolution modes from 6.9Hz/200nV RMS to 3.5kHz/25μV RMS . Key DC specifica-tions include 4ppm maximum INL, 5μV offset, 10ppm full-scale error and 20nV/°C offset drift. In the 6.9Hz/200nV RMS mode, an input normal mode rejection of 50Hz and 60Hz noise is better than 87dB. The accuracy (offset, full-scale, linearity, drift) and power dissipation are independent of the speed selected. The LTC2442 incorporates rail-to-rail buffer amplifiers for true high impedance inputs.DC979A is a member of Linear Technology’s QuikEval™ family of demonstration boards. It is designed to allowL , L T , L TC, L TM, Linear Technology and the Linear logo are registered trademarks andQuikEval and SoftSpan are a trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.BoarD photoeasy evaluation of the LTC2442 and may be connected directly to the target application’s analog signals while using the DC590 USB serial controller board and supplied software to measure performance. The exposed ground planes allow proper grounding to prototype circuitry. After evaluating with L TC’s software, the digital signals can be connected to the application’s processor/controller for development of the serial interface.Design files for this circuit board are available at /demoFigure 1. DC979A Demonstration BoardharDware setupJumpersJp1, Jp2: Select the source for REF+ and REF–, respect-ively. REF+can be 5.00V from the onboard L T®1236 reference (default) or supplied externally. REF– can be ground (0V, default) or supplied externally.Jp3: Select source for analog COM input, either tied to ground or supplied externally to the COM turret post.Jp6, Jp7: Select the positive and negative supply volt-ages for the onboard amplifier. Supplies can be V CC and GND or +10 and –5V from the onboard LTC1983 charge pump. To use an external power supply, REMOVE JP6 and JP7 and connect the external supply to the V+, GND, and V– turrets.Jp4: T rigger mode, either normal (default) or externally triggered (TRIG).Figure 2. Quikeval software2DC979Af3DC979AfDEMO MANUAL DC979AharDware setupexperimentsJp5: Enable/disable the LTC1983 charge pump power supply for onboard amplifier. See JP6, JP7 description.Jp8: T rigger Input Signal. Pin 1 is a 5V logic input, Pin 2 is ground. When triggered mode is selected on JP4, a rising edge starts a new conversion. Note that since a conversion cannot be terminated once started, this signal can only be used to slow down the conversion rate.CONNeCTION TO DC590 serIAL CONTrOLLer J1 is the power and digital interface connector. Connect to the DC590 serial controller with the supplied 14-conductor ribbon cable.ANALOG CONNeCTIONsAnalog signal connections are made via the row of turret posts along the edge of the board. Also, if you are connect-ing the board to an existing circuit, the exposed ground planes along the edges of the board may be used to form a solid connection between grounds.GND: Ground turrets are connected directly to the internal analog ground plane.VCC: This is the supply for the ADC. Do not draw any power from this point. External power may be applied to this point after disabling the switching supply on the DC590. If the DC590 serial controller is being used, the voltage must be regulated 5V only, as the isolation circuitry will also be powered from this supply. See the DC590 Quick Start guide for details.reF +, reF –: These turrets are connected to the LTC2442REF + and REF – pins. If the onboard reference is beingused, the reference voltage may be monitored from this point. An external reference may be connected to these terminals if JP1 and JP2 are configured for external reference.Note: The REF + and REF – terminals are decoupled to ground with 0.01μF and 4.7μF capacitors in parallel. Thus, any source connected to these terminals must be able to drive a capacitive load and have very low impedance at DC. Examples are series references that require an output capacitor and C-load stable op amps, such as the LT1219 and LT1368/CH0-CH3: These are the differential inputs to the LTC2442. They may be configured either as single-ended inputs with respect to the COM pin, or adjacent pairs may be configured as differential inputs (CH0-CH1, CH2-CH3.)INpuT NOIseSolder a short wire from CH0 to CH1. Ensure that the buffer amplifiers are in their active region of operation by either biasing the inputs to mid-supply with a 10kΩ to 10kΩ divider when the buffer amplifier is powered from V CC and ground, or tie the inputs to ground and select +10 and –5V for V + and V –.Set the demo software to OSR32768 (6.8 samples per second) and check the 2X box. Noise should be approxi-mately 0.04ppm of V REF (200nV.) Next, select different oversample ratios. Measured noise for each oversample ratio should be close to the values given in the LTC2442 data sheet.COmmON mODe reJeCTIONTie the two inputs (still connected together from the previ ous experiment) to ground through a short wire andnote the indicated voltage. Tie the inputs to REF +; thedifference should be less than 5μV due to the 120dB CMRR of the LTC2442.Select +10 and –5V for V + and V – for this experiment. If the common mode voltage is limited to GND + 0.25V to V CC – 0.25V, this test may be performed with the amplifier supplies set to ground and V CC .4DC979AfDEMO MANUAL DC979A parts ListITem QTY reFereNCe pArT DesCrIpTIONmANuFACTurer/pArT NumBer DC979A required Circuit Components17C1, C4, C11-C15CAP., X7R, 0.1µF, 16V, 20%, 0402TDK, C1005X7R1C104M 28C2, C5, C7, C8, C9, C16, C17, C21CAP., X5R, 4.7µF, 10V, 20%, 0603TDK, C1608X5R0J475M 33C3, C6, C10CAP., X7R, 0.01µF, 25V, 10%, 0402AVX, 04023C103KAT1A 43C18, C19, C20CAP., X5R, 2.2µF, 10V, 20%, 0805TDK, C2012X5R1A225M 53D1, D2, D3DIODE, SCHOTTKY, SOT23DIODE INC., BAT54S 616E1-E16TESTPOINT, TURRET, 0.064"MILL-MAX, 2308-277JP1-JP7JMP, 3-PIN, 1 ROW, 0.079"SAMTEC, TMM-103-02-L-S 87FOR JP1-JP7, PIN 1 AND PIN 2SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G 90JP8JMP, 2-PIN, 1 ROW, 0.100"COMM CON., 3801S-02G2101J1HEADER, 2×7 PIN, 0.079"MOLEX, 87831-1420110J2CONN, 5-PIN, GOLD, STRAIGHT CONNEX, 132134120R1RES., 0402OPT133R2, R3, R4RES., CHIP, 4.99k, 1/16W, 1%, 0402AAC, CR05-4991FM 141R5RES., CHIP, 100, 1/16W, 5%, 0402VISHAY, CRCW0402101J 152R6, R13RES., CHIP, 10k, 1/16W, 5%, 0402AAC, CR05-103JM 161R7RES., CHIP, 51, 1/16W, 5%, 0402AAC, CR05-510JM 174R8, R9, R10, R12RES., CHIP, 0, 1/16W, 5%, 0805AAC, CJ10-000M 180R11RES., CHIP, 0, 1/16W, 5%, 0805OPT191U1I.C., LTC2442CG, SSOP36G LINEAR TECHNOLOGY, LTC2442CG 201U2I.C., LT1236ACS8-5, SO8LINEAR TECHNOLOGY, LT1236ACS8-5211U3I.C., 24LC025, TSSOP8MICROCHIP, 24LC025-I/ST 221U4IC, NON-INVERTING MUL TIPLEXER, SC70FAIRCHILD, NC7SZ157P6X 231U5IC, SINGLE D, FLIP-FLOP, US8ON SEMI., NL17SZ74US241U6I.C., LTC1983ES6-5, SOT23-6LINEAR TECHNOLOGY, LTC1983ES6-5INpuT NOrmAL mODe reJeCTIONThe LTC2442’s SINC4 digital filter is trimmed to strongly reject both 50Hz and 60Hz line noise when operated with the internal conversion clock and oversample ratio 32768 (6.8 samples per second.) To measure input normal mode rejection, connect COM to a 2.5V source such as an LT1790-2.5 reference or a power supply. Connect any other input (CH0-CH3) to the same supply through a 10k resistor. Apply a 10Hz, 2V peak-to-peak sine wave to the input through a 1µF capacitor.Select OSR32768 (6.8 samples per second) and 2X mode in the demo software and start taking data. The input noise will be quite large, and the graph of output vs time should show large variations.Next, slowly increase the frequency to 55Hz. The noise should be almost undetectable in the graph.Change the OSR to 16384 (13.75 samples per second) the noise will increase substantially, as the first notch at this OSR is at 110Hz. Increase the signal generator frequency to 110Hz, the noise will drop again.experimentsDEMO MANUAL DC979AInformation furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.F i g u r e 3 . D C 9 7 9 A 4 -C h a n n e l , H i g h s p e e d , 2 4 -B i t A D C w i t h B u f f e rschematic Diagram5DC979Af6DC979AfDEMO MANUAL DC979ALinear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417(408) 432-1900 ● FAX : (408) 434-0507 ● www.linear .comLINEAR TECHNOLOGY CORPORA TION 2013LT 0613 • PRINTED IN USADEMONSTRATION BOARD IMPORTANT NOTICELinear Technology Corporation (L TC) provides the enclosed product(s) under the following As Is conditions:This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for eNGINeerING DeVeLOpmeNT Or eVALuATION purpOses ONL Y and is not provided by L TC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT , SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.The user assumes all responsibility and liability for proper and safe handling of the goods. Further , the user releases L TC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.).No License is granted under any patent right or other intellectual property whatsoever. L TC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.L TC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive .please read the DemO BOArD manual prior to handling the product . Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged .This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a L TC applica-tion engineer .Mailing Address:Linear Technology 1630 McCarthy pitas, CA 95035Copyright © 2004, Linear Technology Corporation。
LTC3856 LTC3857多通道同步降压 升压转换器数据手册说明书
Rev. AInformation furnished by Analog Devices is believed to be accurate and reliable. However , no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Speci cations subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. T rademarks and registered trademarks are the property of their respective owners.One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 ©2012 Analog Devices, Inc. All rights reserved.ADI 中文版数据手册是英文版数据手册的译文，敬请谅解翻译中可能存在的语言组织或翻译错误，ADI 不对翻译中存在的差异或由此产生的错误负责。
如需确认任何词语的准确性，请参考ADI 提供的最新英文版数据手册。
TYPICAL APPLICATION CIRCUIT图1.图2.效率与输出电流的关系(V IN = 12 V ，f SW = 600 kHz )B S T 1P V I N 1SW1DL1PGND SW2DL2E N 1PGOOD1S S 1C O M P 1F B 1B S T 2P V I N 2E N 2S S 2C O M P 2F B 2PGOOD2GND SYNC SCFG INTVCC RTVDRV V OUT1V OUT2V INADP2325L1L2C OUT1C OUT2C IN1M1M2R OSCC BST1C SS2C C2R C2R TOP1R BOT2R TOP2C INTC DRVTRK1TRK2MODE V INC IN2C BST2R BOT1R C1C C1C SS110036-0015055606570758085909510001.02.03.04.00.51.52.53.54.55.0E F F I C I E N C Y (%)OUTPUT CURRENT (A)V OUT = 5.0V V OUT = 3.3V10036-002双通道、5 A 、20 V 同步降压调节器，集成高端MOSFETADP2325产品特性输入电压：4.5 V 至20 V 输出精度：±1%集成48 mΩ高端MOSFET (典型值)灵活的输出配置双路输出：5 A/5 A 单路交错式输出：10 A可编程开关频率：250 kHz 至1.2 MHz外部同步输入，可编程相移，或内部时钟输出可选PWM 或PFM 工作模式小型电感的限流可调外部补偿和软启动启动后进入预充电输出ADIsimPower™设计工具支持应用通信基础设施网络和服务器工业与仪器仪表医疗保健中间供电轨转换典型应用电路概述ADP2325是一款功能全面的双通道降压DC-DC 调节器，采用电流模式架构。
LTC6992：硅振荡器
收灵敏度 此外．器件较低的工作电流 （ ｍ 型值 ） ３ Ａ． ５ 可 入共摸电压范围可低至地电位以 Ｆ 上述特性使该教运葬
有效延长州户终端没备的电池使川寿命 出现较商信号电平 放大器适台多种高速应硐，支持 高频 采样和从饱和状悉快 时．内置的旁路开关将 Ｌ ＮＡ置干旁路模式（ｐ ５ Ａ，她型值 ） ． 速恢复 Ｍ Ｘ９ ２ Ａ ６ ２采用微型 （ｍｍ×２ ｍ） Ｉ Ｓ ７ ２ ａ ｒ ■圈 护 Ｎ ｎ 圈圈
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ＬＤ调 、 号隔离 Ｅ 光 信 和其他占 控制应用 皤圆圈圃 空比
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频匹配州络．可优化 ５ Ｄ系统的输出功率，效率和线性度 ０
ＧＩ ． ｎ ｄ ｇ ｃ ・ｏ Ｍａ ｉ ｘｍ推 出 专 为 ＵＨ Ｆ和 ＶＨ Ｆ移动 电视 应 用没 Ｉ ＡＮＡＤＩ ＣＳ ｗｗｗ ａ ａ ｉ ｉ ｓＧ ｍ
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Ｌ Ｃ ９ ２ 硅振荡 器 Ｔ ６９ ：
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Ａ ＷＢ ２ １功 率放 大器 ７２ ：
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低噪声系数 ，能够攫供 比分立器件和 Ｃ ＭＯＳ方案更高的接
BA3528资料
For the input stage, the pin 22 bias point is the input and the negative feedback virtual earth point, and the first stage transistor bias is taken from pin 22. The built-in VREF amplifier uses the same bias point as its input, and its output voltage is about the same as DC output voltage from the power amplifier. This becomes the virtual earth for the headphones (see Fig. 5).
4) No output coupling capacitors required for the power amplifiers. 5) Power amplifiers do not require oscillation prevention measures. 6) Power amplifier gain allows use of noise reduction (BA3529AFP).
FCircuit operation (1) Preamplifier In the preamplifier input stage the pin 22 bias is the input and the negative feedback virtual earth, and the bias for the input stage transistor is taken from pin 22 via the tape head to allow direct coupling. Connect a 1000pF capacitor in parallel with the tape head to prevent high-frequency interference (see Fig. 2).
LabelTech LTC1928-5 低噪声5V电源模块说明书
119285faFor more information www.linear .com/L TC 1928-5Figure 1. Low Noise 5V Power SupplyOutput Noise (BW = 10Hz to 2.5MHz)TYPICAL APPLICATIONFEATURESDESCRIPTIONLow Noise Linear Regulatorin ThinSOTThe L TC ®1928-5 is a doubler charge pump with an internal low noise, low dropout (LDO) linear regulator. The part is designed to provide a low noise boosted supply voltage for powering noise sensitive devices such as high frequency VCOs in wireless applications.An internal charge pump converts a 2.7V to 4.4V input to a boosted output, while the internal LDO regulator converts the boosted voltage to a low noise regulated output. The regulator is capable of supplying up to 30mA of output current. Shutdown reduces the supply current to <8µA, removes the load from V IN by disabling the regulator and discharges V OUT to ground through a 200Ω switch. The LTC1928-5 LDO regulator is stable with only 2µF on the output. Small ceramic capacitors can be used, reduc-ing PC board area.The LTC1928-5 is short-circuit and overtemperature pro-tected. The part is available in a 6-pin low profile (1mm)ThinSOT package.APPLICATIONSn Low Output Noise: 90µV RMS (100kHz BW) n Fixed Output Voltage: 5Vn Input Voltage Range: 2.7V to 4.4V n No Inductors Requiredn Uses Small Ceramic Capacitors n Output Current Up to 30mA n 550kHz Switching Frequency n Low Operating Current: 190µA n Low Shutdown Current: 4µAn Internal Thermal Shutdown and Current Limiting n Low Profile (1mm) ThinSOT™ Packagen VCO Power Supplies for Cellular Phones n 2-Way Pagersn Wireless PCMCIA Cardsn Portable Medical Instruments n Low Power Data Acquisition n Remote T ransmitters n White LED Drivers n GaAs SwitchesL , L T, L TC, L TM, Linear Technology and the Linear logo are registered trademarks and ThinSOT and Burst Mode are trademarks of Linear Technology Corporation. All othertrademarks are the property of their respective owners.VOUT V OUT 200µV/DIV19285 TA01C CPO = C OUT = 4.7µF I OUT = 10mA V IN = 3V V OUT = 5A T A = 25°C100µs/DIV219285faFor more information www.linear .com/L TC 1928-5PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGSV IN to Ground ...............................................–0.3V to 5V V OUT Voltage ...........................................–0.3V to 5.25V CPO to Ground ..........................................................10V CN/SHDN to Ground .....................–0.3V to (V IN + 0.3V)V OUT Short-Circuit Duration .............................Indefinite I OUT ........................................................................40mA Operating Temperature Range (Note 2)....–40°C to 85°C Maximum Junction Temperature ........................ 125°C Storage Temperature Range ..................–65°C to 150°C Lead Temperature (Soldering, 10 sec) ...................300°C(Note 1)123V IN GND V OUT 654CN/SHDN CP CPOTOP VIEWS6 PACKAGE6-LEAD PLASTIC SOT-23T JMAX = 125°C, θJA = 230°C/WORDER INFORMATIONELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at T A = 25°C. V IN = 3V, C FL Y = 0.47µF, C OUT , C CPO , C IN = 4.7µF unless otherwise specified.LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC1928ES6-5#PBFLTC1928ES6-5#TRPBFL TKT6-Lead Plastic SOT-23–40°C to 85°CConsult L TC Marketing for parts specified with wider operating temperature ranges. Consult L TC Marketing for information on nonstandard lead based finish parts.For more information on lead free part marking, go to: /leadfree/For more information on tape and reel specifications, go to: /tapeandreel/PARAMETER CONDITIONSMINTYP MAX UNITSV IN Operating Voltage l2.74.4V I VIN Shutdown Current SHDN = 0V (Note 5)l 48µA I VIN Operating Current I OUT = 0mA, Burst Mode™ Operation l 190330µA Regulated Output Voltage I OUT = 1mAl4.955.1V V OUT Temperature Coefficient ±50ppm Charge Pump Oscillator Frequency I OUT > 500µA, V IN = 2.7V to 4.4V l 480550620kHz CPO Output Resistance V IN = 2.7V, I OUT = 10mA V IN = 4.4V, I OUT = 10mA l l 17 143024Ω ΩV OUT Dropout Voltage (Note 3)I OUT = 10mA, V OUT = 5V l100mV V OUT Enable Time R LOAD = 2k0.6ms V OUT Output Noise Voltage I OUT = 10mA, 10Hz ≤ f ≤ 100kHz I OUT = 10mA, 10Hz ≤ f ≤ 2.5MHz 90 800µV RMS µV P-PV OUT Line Regulation V IN = 2.7V to 4.4V, I OUT = 0l 420mV V OUT Load Regulation I OUT = 1mA to 10mAI OUT = 1mA to 30mA (Note 4)l 2 410mV mV V OUT Shutdown ResistanceCN/SHDN = 0V (Note 5)V IN = 2.7V, Resistance Measured to Ground V IN = 4.4V, Resistance Measured to Groundl l 160 100400 300Ω Ω319285faFor more information www.linear .com/L TC 1928-5ELECTRICAL CHARACTERISTICSNote 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.Note 2: The LTC1928ES6-5 is guaranteed to meet performancespecifications from 0°C to 70°C. Specifications over the –40°C to 85°Coperating temperature range are assured by design, characterization and correlation with statistical process controls.Note 3: Dropout voltage is the minimum input/output voltage required to maintain regulation at the specified output current. In dropout the output voltage will be equal to: V CPO – V DROPOUT (see Figure 2).CN/SHDN Input Threshold V IN = 2.7V to 4.4V (Note 5)l 0.150.5 1.6V CN/SHDN Input CurrentCN/SHDN = 0V (Note 5)l–1–3–6µAThe l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = 25°C. V IN = 3V, C FL Y = 0.47µF, C OUT , C CPO , C IN = 4.7µF unless otherwise specified.TYPICAL PERFORMANCE CHARACTERISTICSShutdown to Enable Timing(Figure 5)Enable to Shutdown Timing (Figure 5)V OUT Voltage vs TemperatureCPO Output Resistance vs V INMin and Max V CPO vs V INV OUT T ransient ResponseV IN (V)R C P O (Ω)35302520151052.53.03.519285 G014.04.5S H D N (V )V O U T (V )19285 G04V IN (V)V C P O (V )987654319285 G02(A) THE MAXIMUM GENERATED NO LOAD CPO VOLTAGE(B) THE MINIMUM ALLOWABLE CPO VOLTAGE, AT FULL LOAD, TO ENSURE THAT THE LDO IS NOT DISABLEDS H D N (V )V O U T (V )19285 G05TIME (µs)050∆VO U T (m V )I O U T (m A )10020015030019285 G03TEMPERATURE (°C)–505.0405.0305.0205.0105.0004.9904.980257519285 G06–25V O U T V O L T A G E (V )419285faFor more information www.linear .com/L TC 1928-5TYPICAL PERFORMANCE CHARACTERISTICSOperating Current vs V IN (No Load)Efficiency vs Supply VoltageOutput Voltage vs Output CurrentV IN (V)O P E R A T I N G C U R R E N T (µA )26024022020018016014012010019285 G072.53.03.54.04.5T A = 25°CSUPPLY VOLTAGE (V)2.640E F F I C I E N C Y (%)50708090 3.0 3.4 3.6 4.419285 G0860 2.8 3.2 3.8 4.0 4.2100OUTPUT CURRENT (mA)0O U T P U T V O L T A G E (V )354019285 G095101525304.9014.9004.9894.9884.9874.9864.9854.9844.9834.982PIN FUNCTIONSV IN (Pin 1): Input Voltage, 2.7V to 4.4V. V IN should be bypassed with a ≥2µF low ESR capacitor as close to the pin as possible for best performance. A minimum capacitance value of 0.1µF is required.GND (Pin 2): System Ground.V OUT (Pin 3): Low Noise Regulated Output Voltage. V OUT should be bypassed with a ≥2µF low ESR capacitor as close to the pin as possible for best performance. The V OUT voltage is internally set to 5V.CPO (Pin 4): Boosted Unregulated Voltage. Approximately 1.95V IN at low loads. Bypass with a ≥2µF low ESR capacitor.CP (Pin 5): Flying Capacitor Positive Input.CN/SHDN (Pin 6): Flying Capacitor Negative Input and SHDN . When this pin is pulled to ground through a 100Ω resistor, the part will go into shutdown within approxi-mately 30µs.519285faFor more information www.linear .com/L TC 1928-5BLOCK DIAGRAMOUT V C FLY APPLICATIONS INFORMATIONOperationThe LTC1928-5 uses a switched-capacitor charge pump to generate a CPO voltage of approximately 2V IN . CPO pow-ers an internal low dropout linear regulator that supplies a regulated output at V OUT . Internal comparators are used to sense CPO and V IN voltages for power-up conditioning. The output current is sensed to determine the charge pump operating mode. A trimmed internal bandgap is used as the voltage reference and a trimmed internal oscillator is used to control the charge pump switches.The charge pump is a doubler configuration that uses one external flying capacitor. When enabled, a 2-phase nonoverlapping clock controls the charge pump switches. At start-up, the LDO is disabled and the load is removed from CPO. When CPO reaches 1.75V IN the LDO is enabled. If CPO falls below 1.45V IN the LDO will be disabled. Gen-erally, the charge pump runs open loop with continuous clocking for low noise. If CPO is greater than 1.95V IN and I OUT is less than 200µA, the charge pump will operate in Burst Mode operation for increased efficiency but slightly higher output noise. In Burst Mode operation, the clock is disabled when CPO reaches 1.95V IN and enabled when CPO droops by about 150mV. The switching frequency is precisely controlled to ensure that the frequency is above 455kHz and at the optimum rate to ensure maximum efficiency. The switch edge rates are also controlled to minimize noise. The effective output resistance at CPO is dependent on the voltage at V IN , CPO, the flying capacitor value C F L Y and the junction temperature. A low ESR capaci-tor of ≥2µF should be used at CPO for minimum noise.The LDO is used to filter the ripple on CPO and to set an output voltage independent of CPO. V OUT is set by an in-619285faFor more information www.linear .com/L TC 1928-5APPLICATIONS INFORMATIONternal reference and resistor divider. The LDO requires a capacitor on V OUT for stability and improved load transient response. A low ESR capacitor of ≥2µF should be used.Maximum I OUT CalculationsThe maximum available current can be calculated based on the open circuit CPO voltage, the dropout voltage of the LDO and the effective output resistance of the charge pump. The open circuit CPO voltage is approximately 2V IN (see Figure 2).exceeds 150°C the part will shut down. Excessive power dissipation due to heavy loads will also cause the part to shut down when the junction temperature exceeds 150°C. The part will become enabled when the junction temperature drops below 140°C. If the fault conditions remain in place, the part will cycle between the shutdown and enabled states.Capacitor SelectionFor best performance it is recommended that low ESR ceramic capacitors be used to reduce noise and ripple. C OUT must be ≥2µF and C CPO must be equal to or greater than C OUT . C IN is dependent on the input power supply source impedance. The charge pump demands large instantaneous currents which may induce ripple onto a common voltage rail. C IN should be ≥2µF and a spike reducing resistor of 2.2Ω may be required between V IN and the supply.A low ESR ceramic capacitor is recommended for the flying capacitor C F L Y with a value of 0.47µF. At low load or high V IN a smaller capacitor could be used to reduce ripple on CPO which would reflect as lower ripple on V OUT .If a minimum enable time is required, the CPO output filter capacitor should be at least 2× the V OUT filter capacitor. When the LDO is first enabled, the CPO capacitor will dump a large amount of charge into the V OUT capacitor. If the drop in the CPO voltage falls below 1.45V IN the LDO will be disabled and the CPO voltage will be required to charge up to 1.75V IN to enable the LDO. The resulting cycling extends the enable time.Output RippleThe output ripple on CPO includes a spike component from the charge pump switches and a droop component which is dependent on the load current and the value of C3. The charge pump has been carefully designed to mini-mize the spike component, however, low ESR capacitors are essential to reduce the remaining spike energy effect on the CPO voltage. C CPO should be increased for high load currents to minimize the droop component. Ripple components on CPO are greatly reduced at V OUT by the LDO, however, C OUT should also be a low ESR capacitor to improve filtering of the CPO noise.Example:V IN = 3VV OUT = 5V R CPO = 30ΩMaximum unloaded CPO voltage = 2V IN = 6V V DROPOUT(MAX) = 100mVI OUT(MAX) = (2V IN – V DROPOUT(MAX) – V OUT )/R CPO = (6V – 0.1V – 5V)/30Ω = 30mA V CPO must be greater than 1.45V IN = 4.35V. To confirm this, calculate V CPO :V CPO = 6V – (30mA • 30Ω) = 5.1VFor minimum noise applications the LDO must be kept out of dropout to prevent CPO noise from coupling into V OUT .External CPO LoadingThe CPO output can drive an external load (for example, an LDO). The current required by this additional load will reduce the available current from V OUT . If the external load requires 1mA, the available current at V OUT will be reduced by 1mA.Short-Circuit and Thermal ProtectionV OUT can be shorted to ground indefinitely. Internal circuitry will limit the output current. If the junction temperatureFigure 2. Equivalent CircuitOUT719285faFor more information www.linear .com/L TC 1928-5APPLICATIONS INFORMATIONShutdownWhen CN/SHDN = 0V, the part will be in shutdown, the supply current will be <8µA and V OUT will be shorted to ground through a 160Ω switch. In addition, CPO will be high impedance and disconnected from V IN and CN/SHDN .Shutdown is achieved by internally sampling the CN/SHDN pin for a low voltage. Time between shutdown samples is about 30µs. During the sample time the charge pump switches are disabled and CN/SHDN must be pulled to ground within 400ns. A resistor value between 100Ω and 1k is recommended. Parasitic lead capacitance should be minimized on the CN/SHDN pin.Power-On ResetUpon initial power-up, a power-on reset circuit ensures that the internal functions are correctly initialized. Once V IN reaches about 1V, the power-on reset circuit will enable the part as long as the CN/SHDN pin is not pulled low.Thermal ConsiderationsThe power handling capability of the device will be limited by the maximum rated junction temperature (125°C). The device dissipation P D = I OUT (2V IN – V OUT ) + V IN (2mA). TheFigure 3. LTC1928-5 Noise Measurement Test SetupFigure 4. LTC1928-5, External Load on CPO, No Shutdown Statedevice dissipates the majority of its heat through its pins, especially GND (Pin 2). Thermal resistance to ambient can be optimized by connecting GND to a large copper region on the PCB, which serves as a heat sink. Applications that operate the LTC1928-5 near maximum power levels should maximize the copper area at all pins except CP and CN/SHDN and ensure that there is some airflow over the part to carry away excess heat.General Layout ConsiderationsDue to the high switching frequency and high transient currents produced by the device, careful board layout is a must. A clean board layout using a ground plane and short connections to all capacitors will improve noise performance and ensure proper regulation.Measuring Output NoiseMeasuring the LTC1928 low noise levels requires care. Figure 3 shows a test setup for taking the measurement. Good connection and signal handling technique should yield about 800µV P-P over a 2.5MHz bandwidth. The noise measurement involves AC-coupling the LTC1928 output into the test setup’s input and terminating this connec-tion with 50Ω. Coaxial connections must be maintained to preserve measurement integrity.R CONNECTORBATTERY OR LOW NOISE DC POWER SUPPLYHP-11048C OR EQUIVALENTAS SHORT AS POSSIBLE19285 F033.3V VPACKAGE DESCRIPTIONPlease refer to /designtools/packaging/ for the most recent package drawings.(NOTE 3)S6 TSOT-23 0302 NOTE:1. DIMENSIONS ARE IN MILLIMETERS2. DRAWING NOT TO SCALE3. DIMENSIONS ARE INCLUSIVE OF PLATING4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR5. MOLD FLASH SHALL NOT EXCEED 0.254mm6. JEDEC PACKAGE REFERENCE IS MO-1930.620.95RECOMMENDED SOLDER PAD LAYOUTPER IPC CALCULATORS6 Package6-Lead Plastic TSOT-23(Reference LTC DWG # 05-08-1636)819285faFor more information /L TC 1928-5919285faFor more information www.linear .com/L TC 1928-5Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.REVISION HISTORYREV DATE DESCRIPTIONPAGE NUMBERA09/15Revised package drawing.81019285faFor more information www.linear .com/L TC 1928-5LINEAR TECHNOLOGY CORPORA TION 2000LT 0915 REV A • PRINTED IN USALinear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417(408) 432-1900 ● FAX : (408) 434-0507 ● www.linear .com/L TC1928-5RELATED PARTSTYPICAL APPLICATIONOUT V PART NUMBER DESCRIPTIONCOMMENTSLTC1550/LTC1551Low Noise, 900kHz Charge Pump 1mV P-P Typical Ripple, Up to 10mA LT1611Inverting 1.4MHz Switching Regulator 5V to –5V at 150mA, Low Output Noise LT1613 1.4MHz Boost Switching Regulator in ThinSOT 3.3V to 5V at 200mA, Low Noise PWM Operation LTC1682Doubler Charge Pump with Low Noise Linear Regulator 60µV RMS Noise, I OUT Up to 80mA, MSOP LTC1754-5Micropower 5V Charge Pump in ThinSOT I Q = 13µA, I OUT to 50mA, Shutdown LT1761 Series 100mA ThinSOT, Low Noise LDO Regulators 20µA I Q , 20µV RMS Noise, 300mV Dropout LTC3200Constant Frequency Doubler Charge PumpLow Noise, 5V Output or AdjustableFigure 5. Low Noise 5V Supply with Shutdown。
LINEAR LTC3855 说明书
6mm × 6mm DC/DC Controller for High Current DCR Sensing ApplicationsEric Gu, Theo Phillips, Mike Shriver and Kerry Holliday“lossless” method is less accurate than using a sense resistor, in large part because as the inductor heats up, its resistance increases with a temperature coeffi-cient of resistivity (TCR) of 3930ppm/°C. Therefore as the temperature rises, the current limit decreases. When DCR sensing is used, the current limit for the LTC3855 is determined by the peak sense voltage as measured across the inductor’s DCR. The LTC3855 includes a temperature sensing scheme designed to compensate for the TCR of copper by effectively raising the peak sense voltage at high temperature.MONITORING THE TEMPERATUREWhen current is sensed at the inductor, either a sense resistor is placed in series with the inductor, or an R-C network across the inductor is used to infer the current information across the induc-tor’s DC resistance (DCR sensing). ThisThe LTC3855 is a versatile 2-phase synchronous buck controller IC with on-chip drivers, remote output voltage sensing and inductor temperature sensing. These features are ideal for high current applications where cycle-by-cycle current is measured across the inductor (DCR sensing). Either channel is suitable for inputs up to 38V and outputs up to 12.5V , further increasing the controller’s versatility. The LTC3855 is based on the popular LTC3850, described in the October 2007 issue of Linear Technology .C C OUT2: SANYO 2R5TPE330M9R NTC : MURATA NCP18WB473J03RBINOUT Figure 1. A 1.2V , 50A, 2-phase converter. The two channels operate 180º out-of-phase to minimize output ripple and component sizes.design ideasDIFFERENTIAL SENSINGAt high load current, an offset candevelop between the power ground, where V OUT is sensed, and the IC’s local ground. To overcome this load regulation error, the LTC3855 includes a unity gain differ-ential amplifier for remote output voltage sensing. Inputs DIFFP and DIFFN are tied to the point of load, and the difference between them is expressed with respect to local ground from the DIFFOUT pin. Measurement error is limited to the input offset voltage of the differential amplifier, which is no more than 2mV.SINGLE OUTPUT CONVERTER WITH REMOTE OUTPUT VOLTAGE SENSING AND INDUCTOR DCR COMPENSATIONFigure 1 shows a high current DCR appli-cation with temperature sensing. The nominal peak current limit is determined by the sense voltage (30mV, set by ground-ing the ILIM pins) across the DC resistance of the inductor (typically 0.83mΩ), or 36A per phase. This sense voltage can be raised by biasing the ITEMP pins below 500mV. Since each ITEMP pin sources10µA, peak sense voltage can be increased by inserting a resistance of less than 25k from ITEMP to ground. By using an inexpensive NTC thermistor placed near the inductors (with series and parallelresistance for linearization), the cur-rent limit can be maintained above the nominal operating current, even at elevated temperatures (Figure 2). The circuit also maintains precise regula-tion by differentially sensing the output voltage. The measurement is not contami-nated by the difference between power ground and local ground. As a result, output voltage typically changes less than 0.2% from no load to full load.MULTIPHASE OPERATIONThe LTC3855 can be configured for dual outputs, or for one output with both power stages tied together, as shown in Figure 1. In the single output configura-tion, both channels’ compensation (ITH), feedback (V FB ), enable (RUN) and track /soft-start (TRK /SS) pins are tied together, and both PGOOD 1 and PGOOD2 will indicate the power good status of the output voltage. By doubling the effective switching frequency, the single output configuration minimizes the required input and output capacitance and volt-age ripple, and allows for fast transient response (Figure 3). The LTC3855 provides inherently fast cycle-by-cycle current sharing due to its peak current mode architecture plus tight DC current sharing.1allowing the user to set the switchingfrequency with a single resistor to ground. The frequency can be set anywhere from 250kHz to 770kHz. If an external fre-quency source is available, a phase-locked loop enables the LTC3855 to sync with frequencies in the same range. A mini-mum on-time of 100ns allows low duty cycle operation even at high frequencies. If the external sync signal is momentarily interrupted, the LTC3855 reverts to the frequency set by the external resistor. Its internal phase-locked loop filter is prebiased to this frequency. An internal switch automatically changes over to the sync signal when a clock train is detected. Since the PLL filter barely has to charge or discharge during this transition, syn-chronization is achieved in a minimum number of cycles, without large swings in switching frequency or output voltage.The LTC3855 is also useful for designsusing three or more phases. Its CLKOUT pin can drive the MODE /PLLIN pins of addi-tional regulators. The PHASMD pin tai-lors the phase delays to interleave all the switch waveforms.D C C U R RE N T L I M I T (A )INDUCTOR TEMP (°C)14020406080100120Figure 2. The converter of Figure 1 can deliver the current whether hot or cold, with its calculatedworst-case current limit remaining above the target 50A, even well above room temperature.I L110A/DIV I L210A/DIV I LOAD 20A/DIVV OUT(AC COUPLED)100mV/DIV50µs/DIVV IN = 12VI LOAD = 30A–50AFigure 3. V OUT is stable in the face of a of 30A to 50A load step for the converter of Figure 1, and the inductor current sharing is fast and precise.E F F I C I E N C Y (%)957090858075(continued on page 35)product briefsULTRALOW VOLTAGE STEP-UPCONVERTER AND POWER MANAGER FOR ENERGY HARVESTINGThe LTC3108 is a highly integrated DC /DC converter ideal for harvest-ing and managing surplus energy from extremely low input voltage sources such as TEG (thermoelectric generators), thermopiles and small solar cells. The step-up topology operates from input voltages as low as 20mV. Using a small step-up transformer, the LTC3108 provides a complete power management solution for wireless sensing and data acquisition. The 2.2V LDO powers an external micro-processor, while the main output isprogrammed to one of four fixed voltages to power a wireless transmitter or sen-sors. The power good indicator signals that the main output voltage is within regulation. A second output can beenabled by the host. A storage capacitor provides power when the input volt-age source is unavailable. Extremely low quiescent current and high efficiency design ensure the fastest possible charge times of the output reservoir capacitor.POWERFUL SYNCHRONOUSN-CHANNEL MOSFET DRIVER IN A 2MM × 3MM DFNThe LTC4449 is high speed synchro-nous MOSFET driver designed to maximize efficiency and extend the operating voltage range in a wide vari-ety of DC /DC converter topologies, from buck to boost to buck-boost.The LTC4449’s rail-to-rail driver out-puts operate over a range of 4V to6.5V and can sink up to 4.5A and source up to 3.2A of current, allowing it to easily drive high gate capacitance and /or multiple MOSFETs in parallel for high current applications. The high side driver can withstand voltages up to 38V. Adaptive shoot-through protec-tion circuitry is integrated to prevent MOSFET cross-conduction current. With 14ns propagation delays and 4ns to 8ns transition times driv-ing 3nF loads, the LTC4449 minimizes power loss due to switching losses and dead time body diode conduction.The LTC4449 features a three-statePWM input for power stage control and shutdown that is compatible with all con-trollers that employ a three-state output feature. The LTC4449 also has a separate supply input for the input logic to match the signal swing of the controller IC. Undervoltage lockout detectors monitor both the driver and logic supplies and dis-able operation if the voltage is too low. nsense comparator looks across the cur-rent sense element (here the inductor’s DC resistance, implied from the associ-ated R-C network). If a short circuit occurs, current limit foldback reduces the peak current to protect the power components. Foldback is disabled dur-ing start-up, for predictable tracking.CONCLUSIONThe LTC3855 is ideal for converters using inductor DCR sensing to provide high cur-rent outputs. Its temperature compensa-tion and remote output voltage sensing ensure predictable behavior from light load to high current. From inputs up to 38V it can regulate two separate outputs from 0.6V to 12.5V, and can be configured for higher currents by tying its channels together, or by paralleling additionalLTC3855 power stages. At low duty cycles, the short minimum on-time ensures con-stant frequency operation, and peak cur-rent limit remains constant even as duty cycle changes. The LTC3855 incorporates these features and more into 6mm × 6mm QFN or 38-lead TSSOP packages. nThe MOSFET drivers and control circuits are powered by INTV CC , which by default is powered through an internal low dropout regulator from the main input supply, V IN . If lower power dissipation in the IC is desired, a 5V supply can be connected to EXTV CC . When a supply is detected on EXTV CC , the LTC3855 switches INTV CC over to EXTV CC , with a drop of just 50mV. The strong gate drivers with optimized dead time provide high effi-ciency. The full load efficiency is 86.7% and the peak efficiency is 89.4% (Figure 4).The LTC3855 features a RUN and TRACK /SS pin for each channel. RUN enables the output and INTV CC , while TRACK /SS acts as a soft-start or allows the outputs to track an external reference. If a multiphase out-put is desired, all RUN and TRACK /SS pins are typically tied to one another.Peak current limiting is used in this application, with the peak sense volt-age set by the three-state ILIM pin. Ahigh speed rail-to-rail differential current(LTC 3855 continued from page 29)CONCLUSIONThe LT3029 is a dual 500mA/500mA mono-lithic LDO with a wide input voltage range and low noise. The two channels are fully independent, allowing for flexible power management. It is ideal for battery-pow-ered systems because of its low quiescent current, small package and integra-tion of battery protection features. nFigure 2. Start-up time vs bypass capacitor valueS T A R T -U P T I M E (m s )BYPASS CAPACITANCE (pF)10k101000.011001k 1 0.1 10(LT 3029 continued from page 35)。
LTC2950ITS8-2中文资料
Control ■ Simple Interface Allows Graceful μP Shut Down ■ High Input Voltage PB Pin with Internal Pull Up
LTC2950-1/LTC2950-2
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25C. VIN = 2.7V to 26.4V, unless otherwise noted. (Note 2)
8-Lead Plastic TSOT-23
TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on lead based finish parts.
Push Button Pin (PB)
VPB(MIN, MAX) IPB
PB Voltage Range PB Input Current
VPB(VTH) VPB(VOC)
SYMBOL
LTTJ资料
2 0.02 0.02 0.2
(Notes 6, 7, 10) (Note 11)
q
1 0.2 5 1 0 5 100 50 250 1.05
q q
V+
V MΩ MΩ
400 5 600
µV/V mV µV/V
1967f
元器件交易网
LTC1967
ELECTRICAL CHARACTERISTICS
CONDITIONS 50Hz to 5kHz Input (Notes 6, 7)
q
Additional Error vs Crest Factor (CF) 60Hz Fundamental, 200mVRMS 60Hz Fundamental, 200mVRMS Accuracy = 1% (Note 14) Average, Differential (Note 12) Average, Common Mode (Note 12) (Note 13) (Note 9)
, LTC and LT are registered trademarks of Linear Technology Corporation. Protected under U.S. Patent Numbers 6,359,576, 6,362,677 and 6,516,291
s
s
s
s
s
s
U APPLICATIO S
0.2 LTC1967, ∆Σ 0 –0.2 –0.4 –0.6 –0.8 –1.0 60Hz SINEWAVE 0 100 200 300 VIN (mV ACRMS) 400 500
1967 TA01b
Single Supply RMS-to-DC Converter
可调频率的电流型宽输入范围的IC-LTC3805-5
外 部 时 段 给定 。 内部 软 起 动 及 故 障 时 段 减小 可 以
由外 部Ｓ ＦＪ端 电容来增 加 。 ＳＩ ｒ ｒ 将Ｓ Ｆ Ｊ Ｓ ｌ 端悬 浮 开路 时即使 用 内部 软 起动 及故 ｒ ｒ 障时段 ，内部 软起 动 为 １ ｍｓ ． ，在 过 流 时 ，由Ｏ 端 ８ Ｃ 超 过 １ ０ Ｖ决定 ．Ｌ Ｃ ８ ５ ５ 断及 内部 等 待时 段 ０ｍ Ｔ ３０ — 关
电压也 随之增 加 。
在 没 有 过 流 保 护 时 ，对应 最 大 变 换 器 输 出 电
流 ， 上 的 电压 上 升 并 被 钳 制 在 １ Ｖ，这 对 应 着 ． ９
姐
＞ ㈨
Ｎ
端 １０ Ｖ的限制 ，随着 输 出电 流 进 一 步增 加 ， ０ｍ
ＡＮＤ ｃ Ｖｃ ＞Ｕ￣ Ｔ Ｎ
Ｓ 及外 部ＭＯ Ｆ Ｔ Ｒ ＳＥ 。 从 Ｆ 端 通 过 误 差 放 大 器 、 电流 比较 器 和 Ｓ Ｂ Ｒ
Ｆ 端 电压 为 ８０ Ｂ ０ ｍＶ的 内部 基 准 电压 ，如 果 负 载 电
流增 加 ，输 出 电 压 降低 一 些 ，会 使 加 ￣ Ｆ 的 电 压 ＩＢ Ｊ 降低 ，低 于８ ０ ０ ｍＶ，这 时误 差放 大器 即刻 响应 进入
医图团圆
Ｉ ７乙 一Ｊ ‘ Ｉ
图１ Ｌ Ｃ３ ０ — 的 内部 电路 结 构 图 Ｔ ８５ ５
２ Ｌ Ｃ ８ ５ ５ 用 设 计 Ｔ ３０ — 应
２１ 主控 制环 路 ．
Ｌ Ｃ ８ ５ ５ 电流 比较器 在 达 到保 护 电平 时 ，即将 Ｔ ３ ０— 的
Ｓ 复 位 ，关 闭外 部 功率 ＭＯ Ｆ Ｔ Ｒ Ｓ Ｅ 。用此 方法 ，通过 ＭＯ Ｆ Ｔ Ｓ Ｅ 的电流 值 ，反 激变 压 器初 级 及 次级 绕 组都
贴片光敏IC PT3528BC_O
承认编号 修订日期
页
次
注意事项：
■产品储存： 1. 未打开原始包装的情况下，建议储存的环境为:温度:5℃-30℃，湿度:85%以下。 2. 打开原始包装后，建议储存环境为：温度：5℃-30℃，湿度：60%以下。 3. 本产品是湿度敏感器件，为避免原件吸湿，建议打开包装后，将其储存在有干燥剂的密闭容器 内，或者储存在氮气防潮柜内。 4. 打开包装后，原件应该在12小时内使用。 5. 如果干燥剂失效或者器件暴露空气中超过12小时，应作除湿处理：条件：60℃/24H。 ■产品烘烤除湿： 1. 焊接本产品前使用说明：如果在打开包装之后，但在焊接之前，产品暴露于潮湿的环境中，则 在焊接过程中，产品可能会发生损坏。 2. 储存方式的说明：暴露时间超出下面规定时间的产品必须依照下面所列的烘焙条件进行烘焙。 下面的降级表确定了本产品可以暴露在所列的湿度和温度条件下的最长时间（以天为单位）。
产品特性：
■模似人眼感光，峰值感光波长590nm，可抗红外线干扰 ■批量一致性好、静态电流小 ■响应速度快、性能稳定 ■外形美观
量身订制：
■可按要求提供不同外型尺寸，方便安装于产品的任何位置 ■可按需求提供最适合产品的亮电流\暗电流（亮电阻\暗电阻），让产品一致性更加好，更具市 场竞争力
承认编号 修订日期
Vcc=5V Ev=10Lux Vcc=5V Ev=30Lux Vcc=5V Ev=100Lux Vcc=5V Ev=0Lux Vcc=5V/850nm IR LED Ee=1mW/c㎡ Vcc=5V Ev=30Lux RL=1000Ω
最小值 -400 -1.5 4.5 15 ---
典型值 550 -5 3 9 30 --4.5 4.5
最大值 -700 -4.5 13.5 45 0.1 0.1
LT1585CM-3.3中文资料
θJA = 50°C/W
VIN
LT1584CT-3.3 LT1584CT-3.45 LT1585CT-3.3 LT1585CT-3.45
VOUT LT1587CT-3.3 LT1587CT-3.45
GND LT1584CT-3.38 LT1584CT-3.6
LT1584: C2 = 22µF, LT1585/LT1587: C2 = 10µF
1585 TA01
NOTE: MICROPROCESSOR APPLICATIONS WITH LOAD TRANSIENTS OF 3.8A REQUIRE
OUTPUT DECOUPLING CAPACITANCE > 1300µF ON FIXED VOLTAGE PARTS TO ACHIEVE < 50mV OF DEVIATION FROM NOMINAL OUTPUT. CONSULT FACTORY FOR DETAILS
q 1.225 (– 2%) 1.250 1.275 (+ 2%)
V
Output Voltage
LT1584-3.3 LT1585-3.3
LT1587-3.3
4.75V ≤ VIN ≤ 6.3V, 0mA ≤ IOUT ≤ 7A 4.75V ≤ VIN ≤ 7V, 0mA ≤ IOUT ≤ 4.6A, TJ ≥ 25°C 4.75V ≤ VIN ≤ 7V, 0mA ≤ IOUT ≤ 4A, TJ < 25°C 4.75V ≤ VIN ≤ 7V, 0mA ≤ IOUT ≤ 3A
M PACKAGE
T PACKAGE
3-LEAD PLASTIC DD PAK
贴片发光二极管 3528翠绿色 SMD TOP LED 灯珠中英文参数资料
符号 Symbol
IF IFP VR PD Topr Tstg
焊接温度Soldering Temperature
Tsld
1/10 周期, 0.1 msec 脉宽 IFP Conditions : 1/10 Duty Cycle, 0.1 msec Pulse Width.
最大额定值 Absolute Maximum Rating
第7页共8页
1. 包装 PACKAGING
(1) LEDS 在装带之后纸箱包装. The LEDs are packed in cardboard boxes after taping. (2) 装带规格 TapingSpecifications (单位:毫米 Units:mm)
编制 Prepared by
洸子其确认
CONFIRMATION
审核
核准
Checked by
Approved by
市场部 Market Dept.
确认 Confirmed by
客户确认
CUSTOMER CONFIRMATION
审核
核准
Checked by
Approved by
确认 Confirmed by
30 150
9 100
-40ºC To +85ºC -40ºC To +85ºC
ReflowSoldering:260ºC Hand Soldering : 350ºC
单位 Unit mA mA
V mW °C °C for 10sec. for 3sec.
(2) 样品光电参数 Initial Electrical/Optical Characteristics (TA=25±5ºC)
LTC2954CDDB-2中文资料
IPB
PB Input Current
VPB(VTH) VPB(VOC) tEN, Lock Out IEN(LKG)
PB Input Threshold PB Open Circuit Voltage EN/EN Lock Out Time (Note 5) EN/EN Leakage Current
●
6
12
µA
● 2.2
2.3
2.5
V
50
400
700
mV
● –1
26.4
V
2954f
元器件交易网
LTC2954
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
Storage Temperature Range DFN Package..................................... – 65°C to 125°C TSOT-23............................................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
TOP VIEW
GND 1
8 INT
ONT 2
7 EN/EN
9
PB 3
6 PDT
VIN 4
5 KILL
DDB PACKAGE 8-LEAD (3mm × 2mm) PLASTIC DFN
The LTC2954 operates over a wide 2.7V to 26.4V input voltage range to accommodate a wide variety of input power supplies. Very low quiescent current (6µA typical) makes the LTC2954 ideally suited for battery powered applications. Two versions of the part are available to accommodate either positive or negative enable polarities.
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APPLICATIONS
n n n
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Medical Instruments Noise Canceling Headphones Wireless Mice Bluetooth Headsets
TYPICAL APPLICATION
Efficiency and Power Loss
100 2.2µH SW VIN 4.7µF VOUT 499k 68pF LTC3528-2 PGOOD OFF ON SHDN GND FB 287k
n
DESCRIPTION
The LTC®3528-2 is a synchronous, fixed frequency step-up DC/DC converter with output disconnect. High efficiency synchronous rectification, in addition to a 700mV startup voltage and operation down to 500mV once started, provides longer run-time for single or multiple cell batterypowered products. A switching frequency of 2MHz minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. The current mode PWM is internally compensated, simplifying the design process. The LTC3528-2 enters Burst Mode operation at light loads. Anti-ringing circuitry reduces EMI by damping the inductor in discontinuous mode. Additional features include a low shutdown current, open-drain power good output, short-circuit protection and thermal overload protection. The LTC3528-2 is offered in an 8-lead 2mm × 3mm × 0.75mm DFN package.
POWER LOSS
OAD CURRENT (mA)
35282 TA01b
35282fb
芯天下--/
1
LTC3528-2 ABSOLUTE MAXIMUM RATINGS
VIN Voltage.................................................... –0.3V to 6V SW Voltage DC............................................................. –0.3V to 6V Pulsed < 100ns......................................... –0.3V to 7V SHDN, FB Voltage......................................... –0.3V to 6V VOUT.............................................................. –0.3V to 6V PGOOD.......................................................... –0.3V to 6V Operating Junction Temperature Range (Notes 2, 5)............................................. –40°C to 125°C Junction Temperature............................................ 125°C Storage Temperature Range................... –65°C to 125°C
The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 1.2V, VOUT = 3.3V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
PARAMETER VIN Range Minimum Start-Up Voltage Output Voltage Adjust Range Feedback Voltage Feedback Input Current Quiescent Current—Shutdown Quiescent Current—Active Quiescent Current—Burst P-Channel MOSFET Switch Leakage Current N-Channel MOSFET Switch On Resistance P-Channel MOSFET Switch On Resistance N-Channel MOSFET Current Limit Current Limit Delay Time to Output Maximum Duty Cycle (Note 3) VFB = 1.15V CONDITIONS
(Note 1)
PIN CONFIGURATION
TOP VIEW SHDN 1 FB 2 PGOOD 3 VOUT 4 9 8 VIN 7 SGND 6 PGND 5 SW
DDB PACKAGE 8-LEAD (3mm × 2mm) PLASTIC DFN TJMAX = 125°C, θJA = 76°C/W (NOTE 6) EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
35282 TA01a
90 80 EFFICIENCY (%) 70 60 50 40 30 20 10
VOUT = 3.3V VIN = 2.4V EFFICIENCY
1000 100 POWER LOSS (mW) 10 1 0.1 0.01 1000
VIN 1.8V TO 3.2V
VOUT 3.3V 400mA 10µF
LTC3528-2 ELECTRICAL CHARACTERISTICS
PARAMETER Minimum Duty Cycle Frequency SHDN Input High Voltage SHDN Input Low Voltage SHDN Input Current PGOOD Threshold Percentage PGOOD Low Voltage PGOOD Leakage Current VSHDN = 1.2V Referenced to Feedback Voltage Falling IPGOOD = 1mA VOUT = 1.6V, IPGOOD = 1mA VPGOOD = 5.5V –7 0.3 –10 0.05 0.05 0.01 CONDITIONS VFB = 1.3V
0.5 1.7 1.6 1.170 1.200 1 0.01 300 12 0.1 0.1 0.175 0.250
l
1.230 50 1 500 20 10 10
N-Channel MOSFET Switch Leakage Current VSW = 5V
l
1.0 87
1.5 60 92
l
2
芯天下--/
MIN
l l l
TYP 0.70
MAX 5.5 0.88 5.25 5.25
UNITS V V V V V nA µA µA µA µA µA Ω Ω A ns %
35282fb
Operating, Excluding Start-Up ILOAD = 1mA TA = 0°C to 85°C (Note 7) VFB = 1.3V VSHDN = 0V, Not Including Switch Leakage, VOUT = 0V Measured on VOUT, Nonswitching (Note 4) Measured on VOUT , FB > 1.230V VSW = 5V, VOUT = 0V
ORDER INFORMATION
LEAD FREE FINISH LTC3528EDDB-2#PBF TAPE AND REEL LTC3528EDDB-2#TRPBF PART MARKING LDNZ PACKAGE DESCRIPTION 8-Lead (3mm × 2mm) Plastic DFN TEMPERATURE RANGE –40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: /leadfree/ For more information on tape and reel specifications, go to: /tapeandreel/