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| LTC3772_15 Datasheet, PDF (16/20 Pages) Linear Technology – Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller | |||
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LTC3772
TYPICAL APPLICATIO S
550kHz Micropower 4A Step-Down DC/DC Converter
470pF
24.9k
82.5k
ITH/RUN VIN
LTC3772
GND PGATE
IPRG
VFB
SW
22pF 174k
L1: VISHAY IHLP-2525CZ-01
NTMS5PO2R2
L1 2.2µH
B320A
VIN
2.75V TO 9.8V
22µF
47µF
VOUT
2.5V
4A
3772 TA03a
VOUT
2V/DIV
Start-Up
ITH/RUN
1V/DIV
IL
1A/DIV
VIN = 5V
VOUT = 2.5V
RLOAD = 3â¦
500µs/DIV
Efficiency vs Load Current
100
95
VIN = 3.3V
90
VIN = 5V
85
80
75
70
65
60
100
1000
LOAD CURRENT (mA)
10000
3772 TA03b
Load Step
3772 TA03c
VOUT
200mV/DIV
AC COUPLED
IL
2A/DIV
ILOAD
2A/DIV
VIN = 5V
VOUT = 2.5V
20µs/DIV
3772 TA03d
3772f
16
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