LTC3610资料

LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3610EWP
LTC3610EWP#TR
LTC3610WP
64-Lead (9mm × 9mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The LTC3610 can be configured for discontinuous or forced continuous operation at light load. Forced continuous operation reduces noise and RF interference while discontinuous mode provides high efficiency by reducing switching losses at light loads.
APPLICATIONS
■ Point of Load Regulation ■ Distributed Power Systems
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6100678, 6580258, 5847554, 6304066.
LTC3610
24V, 12A Monolithic Synchronous Step-Down
DC/DC Converter DESCRIPTION
The LTC®3610 is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 12A output current from a 4V to 24V (28V maximum) input supply. It uses a valley current control architecture to deliver very low duty cycle operation at high frequency with excellent transient response. The operating frequency is selected by an external resistor and is compensated for variations in VIN and VOUT.
PIN CONFIGURATION
TOP VIEW
PGND 1 PGND 2 PGND 3
SW 4 SW 5 SW 6 SW 7 SW 8 SW 9 SW 10 SW 11 PVIN 12 PVIN 13 PVIN 14 PVIN 15 PVIN 16
65 PGND
66 SW
67 PVIN
68 SGND
TYPICAL APPLICATION
High Efficiency Step-Down Converter
0.1μF 100pF
470pF 31.83k
VON
ION
RUN/SS VIN
LTC3610
SW
ITH
BOOST
SGND INTVCC FCB
VRNG PGOOD PGND EXTVCC VFB
For more information on lead free part marking, go to: /leadfree/ For more information on tape and reel specifications, go to: /tapeandreel/
元器件交易网
FEATURES
■ 12A Output Current ■ Wide VIN Range = 4V to 24V ■ Internal N-Channel MOSFETs ■ True Current Mode Control ■ Optimized for High Step-Down Ratios ■ tON(MIN) ≤100ns ■ Extremely Fast Transient Response ■ Stable with Ceramic COUT ■ ±1% 0.6V Voltage Reference ■ Power Good Output Voltage Monitor ■ Adjustable On-Time/Switching Frequency ■ Adjustable Current Limit ■ Programmable Soft-Start ■ Output Overvoltage Protection ■ Optional Short-Circuit Shutdown Timer ■ Low Shutdown IQ: 15μA ■ Available in a 9mm × 9mm 64-Pin QFN Package
VIN = 5V VIN = 12V
10000 1000
100
POWER LOSS 12V 10
POWER LOSS 5V
VOUT = 2.5V 1
0.1
1
10
LOAD CURRENT (A)
3610 TA01b
3610fd
1
元器件交易网
LTC3610
ABSOLUTE MAXIMUM RATINGS
Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and an optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished using an external timing capacitor. The regulator current limit is user programmable. A power good output voltage monitor indicates when the output is in regulation. The LTC3610 is available in a compact 9mm × 9mm QFN package.
tON(MIN) tOFF(MIN) IVALLEY(MAX)பைடு நூலகம்
IVALLEY(MIN)
ΔVFB(OV) VRUN/SS(ON) VRUN/SS(LE) VRUN/SS(LT) IRUN/SS(C) IRUN/SS(D) VIN(UVLO) VIN(UVLOR) RDS(ON)
Feedback Reference Voltage Feedback Voltage Line Regulation Feedback Voltage Load Regulation Feedback Input Current Error Amplifier Transconductance Forced Continuous Threshold Forced Continuous Pin Current On-Time
TEMPERATURE RANGE –40°C to 85°C TEMPERATURE RANGE –40°C to 85°C
3610fd
2
元器件交易网
LTC3610
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loop
64 PGND 63 PGND 62 PGND 61 PGND 60 PGND 59 PGND 58 PGND 57 PGND 56 PGND 55 SW 54 INTVCC 53 INTVCC 52 SVIN 51 SVIN 50 SGND 49 SGND
48 SGND 47 SGND 46 SGND 45 SGND 44 EXTVCC 43 VFB 42 SGND 41 ION 40 SGND 39 FCB 38 ITH 37 VRNG 36 PGOOD 35 VON 34 SGND 33 SGND
PVIN 17 PVIN 18 PVIN 19 PVIN 20 PVIN 21 PVIN 22 PVIN 23 PVIN 24 PVIN 25 SW 26
NC 27 SGND 28 BOOST 29 RUN/SS 30 SGND 31 SGND 32
WP PACKAGE 64-LEAD (9mm × 9mm) QFN MULTIPAD
(Note 1)
Input Supply Voltage (VIN, ION) .................. 28V to –0.3V Boosted Topside Driver Supply Voltage
(BOOST) ................................................ 34V to –0.3V SW Voltage ............................................... 28V to –5V INTVCC, EXTVCC, (BOOST – SW), RUN/SS, PGOOD Voltages...................................... 7V to –0.3V FCB, VON, VRNG Voltages............ INTVCC + 0.3V to –0.3V ITH, VFB Voltages ....................................... 2.7V to –0.3V Operating Temperature Range (Note 4) ............................................... –40°C to 85°C Junction Temperature (Note 2) ............................. 125°C Storage Temperature Range................... –55°C to 125°C
3610 TA01a
604k
0.47μH 0.22μF
VIN 4V TO 24V 10μF
×3
100μF ×2
VOUT 2.5V
12A
4.7μF
30.1k
9.5k
EFFICIENCY (%)
POWER LOSS (mW)
Efficiency vs Load Current
100 95 90 85 80 75 70 65 60 55 50 0.01
VIN
Operating Input Voltage Range
IQ
Input DC Supply Current
Normal
Shutdown Supply Current
4
24
V
900 2000
μA
15
30
μA
VFB ΔVFB(LINEREG) ΔVFB(LOADREG) IFB gm(EA) VFCB IFCB tON
TJMAX = 125°C, θJA = 28°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3610EWP#PBF
LTC3610EWP#TRPBF LTC3610WP
64-Lead (9mm × 9mm) Plastic QFN