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| LTC3772B Datasheet, PDF (16/20 Pages) Linear Technology – Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller | |||
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LTC3772B
TYPICAL APPLICATIO S
550kHz Micropower 3A Step-Down DC/DC Converter
220pF
34.8k
82.5k
ITH/RUN VIN
LTC3772B
GND PGATE
IPRG
VFB
SW
22pF 174k
NTMS5PO2R2
VIN
2.75V TO 9.8V
CIN
22µF
L1 2.2µH
B320A
COUT
100µF
Ã2
VOUT
2.5V
3A
L1: VISHAY IHLP-2525CZ-01
CIN: GRM32ER61A220KA65B
COUT: TAIYO YUDEN LDK375BJ107MM
3772B TA03a
Start-Up
Efficiency vs Load Current
100
90
VIN = 3.3V
80
VIN = 5V
70
60
50
40
1
10
100
1000
LOAD CURRENT (mA)
10000
3772B TA03b
Load Step
VOUT
2V/DIV
ITH/RUN
1V/DIV
IL
2A/DIV
CITH = 220pF
RITH = 34.8k
RLOAD = 1.5â¦
400µs/DIV
3772B TA03c
VOUT
100mV/DIV
(AC)
IL
2A/DIV
ILOAD
2A/DIV
VIN = 5V
20µs/DIV
VOUT = 2.5V
ILOAD = 15OmA TO 2A
3772B TA03d
3772bfa
16
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