AP8660

Applications
Chargers LCD Displays Digital Cameras Handheld Devices Portable Products
Typical Application Circuit
SHIWEI SEMICONDUCTOR Co.,LTD. 深圳市世微半导体有限公司
IOCP 48000 R3
Over Voltage Protection (OVP)
In some condition, the resistive divider may be unconnected, which will cause PWM signal to operate with maximum duty cycle and power switch voltage is boosted higher and higher. The power MOSFET will be turned off immediately, when the power switch voltage exceeds the OVP threshold level. The AP8660’s OVP threshold is 27V.
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AP8660
2A 150KHZ PWM Buck DC/DC Converter Function Block Diagram
Pin Descriptions
SOT23-6L
Name
LX GND
6
No. I / O
1 2 3 4 5 6 O P I I P I IC Ground
Parameter
Supply Voltage Operating Temperature Range
Symbol
VIN TA
Conditions
Ambient Temperature
Min.
2.6 -40
Typ.
Max.
5.5 +85
Unit
V °C
DC Electrical Characteristics (VCC=3.3V, TA=25°C,unless otherwise specified)
Top View
LX GND FB
1
OC VCC EN
FB EN VCC OC
2
5
3
4
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AP8660
2A 150KHZ PWM Buck DC/DC Converter Ordering Information
Symbol
Conditions
Min.
Typ.
Max.
Unit
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AP8660
2A 150KHZ PWM Buck DC/DC Converter Function Description
Current Limit Program
A resistor between OC and GND pin programs peak switch current. The resistor value should be between 10k and 100k. The current limit will be set from 2.5A to 0.5A. Keep traces at this pin as short as possible. Do not put capacitance at this pin. To set the over current trip point according to the following equation:
Symbol
VCC VOVP VLX
Conditions
Min.
0 0 0 0
Typ.
Max.
6 28 28 6 455 +220 +150 +85 +150 +260
Unit
V V V V mW °C / W °C °C °C °C
Note1: θJA is measured in the natural convection at TA=25°C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard.
Parameter
System Supply Input Input Supply Range Under Voltage Lockout UVLO Hysteresis Quiescent Current Average Supply Current Shutdown Supply Current Oscillator Operation Frequency Frequency Change with Voltage Maximum Duty Cycle Reference Voltage Feedback Voltage Line Regulation Enable Control Enable Voltage Shutdown Voltage MOSFET On Resistance of Driver Protection OVP Threshold Voltage OVP Sink Current OCP Current Adjustable OCP Current OTP Temperature VOVP ISINK IOCP IOCP TOTP With External Resistor： 10k~100k 2 0.5 +150 27 5 2.6 2.6 V µA A A °C RDS (ON) ILX=2A 0.25 Ω VEN VEN 0.96 0.6 V V VREF VCC=2.7V～5.5V 0.588 0.6 0.05 0.612 V %/V FOSC TDUTY VFB=1.0V 0.8 1.0 5 90 1.2 MHZ % % △f / △V VCC=2.7V to 5.5V ICC ICC ICC VFB=0.66V, No switching VFB=0.55V, Switching VEN=GND VCC VUVLO 2.6 2.2 0.1 0.16 2.84 0.1 5.5 V V V mA mA µA
AP8660
1MHz, 2A Step-Up Current Mode PWM Converter General Description
The AP8660 is a current mode boost DC-DC converter. Its PWM circuitry with built-in 0.25Ω power MOSFET make this regulator highly power efficient. The internal compensation network also minimizes as much as 6 external component counts. The non-inverting input of error amplifier connects to a 0.6V precision reference voltage and internal soft-start function can reduce the inrush current. The AP8660 is available in the SOT23-6L package and provides space-saving PCB for the application fields.
Part Number
AP8660R-G1
Code
AL
Operating Temperature
6 -40°C ~ 85°C
Package
SOT23-6L
MOQ
3000EA
Description
Tape & Reel
Absolute Maximum Ratings
Parameter
Supply Voltage OVP Voltage LX Voltage EN,FB Voltage Power Dissipation Thermal Resistance (Note1) Junction Temperature Operating Temperature Storage Temperature Lead Temperature PD θJA TJ TOP TST (soldering, 10 sec) -40 -65 SOT23-6L @TA=25°C SOT23-6L
Βιβλιοθήκη BaiduIR Re-flow Soldering Curve
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AP8660
2A 150KHZ PWM Buck DC/DC Converter Recommended Operating Conditions
Features
Adjustable Output up to 24V Internal Fixed PWM frequency: 1.0MHz Precision Feedback Reference Voltage: 0.6V (±2%) Internal 0.25Ω, 2A, 26V Power MOSFET Shutdown Current: 0.1μA Over Voltage Protection Over Temperature Protection Adjustable Over Current Protection: 0.5A ~ 2.5A Package: SOT23-6L
Operation
The AP8660 is a current mode boost converter. T - he constant switching frequency is 1MHz and operates with pulse width modulation (PWM). Build-in 26V / 2A MOSFET provides a high output voltage. The control loop architecture is peak current mode control; therefore slope compensation circuit is added to the current signal to allow stable operation for duty cycles larger than 50%.
Soft Start Function
Soft start circuitry is integrated into AP8660 to avoid inrush current during power on. After the IC is enabled, the output of error amplifier is clamped by the internal soft-start function, which causes PWM pulse width increasing slowly and thus reducing input surge current.
Description
Power Switch Output Error Amplifier Inverting Input Enable Control (Active High) IC Power Supply Adjustable Current Limit (Floating Available)