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| LTC3772B Datasheet, PDF (17/20 Pages) Linear Technology – Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller | |||
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TYPICAL APPLICATIO S
550kHz Micropower 5VIN to 1.8VOUT at 8A DC/DC Converter
470pF
15k
140k VIN
ITH/RUN VIN
LTC3772B
GND PGATE
IPRG
VFB
SW
22pF 174k
Si9433DBY
Ã2
L1 1µH
CSHD10-45L
VIN
5V
CIN
22µF
COUT
100µF
Ã2
L1: TOKO FDV0630-1R0
CIN: MURATA GRM32ER61C226K
COUT: MURATA GRM32ER60J107K
VOUT
1.8V
8A
3772B TA04a
Efficiency vs Load Current
100
90
80
70
60
50
40
100
1000
LOAD CURRENT (mA)
10000
3772B TA04b
Start-Up
Load Step
LTC3772B
VOUT
1V/DIV
ITH/RUN
1V/DIV
IL
5A/DIV
VIN = 5V
VOUT = 1.8V
RLOAD = 0.25â¦
500µs/DIV
3772B TA04c
VOUT
200mV/DIV
AC COUPLED
IL
10A/DIV
ILOAD
10A/DIV
VIN = 5V
20µs/DIV
VOUT = 1.8V
ILOAD = 800mA TO 8A
3772B TA04d
3772bfa
17
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