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| LTC3125_15 Datasheet, PDF (14/18 Pages) Linear Technology – 1.2A Synchronous Step-Up DC/DC Converter with Input Current Limit | |||
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LTC3125
TYPICAL APPLICATIONS
VIN
2.5V TO 5V
500mA MAX
Stacked Supercap Charger
2.2μH*
10μF
CER
OFF ON
44.2k
CS
SW
VIN
VOUT
LTC3125
SHDN
PROG
FB
GND
2.74M
1M
+
100k
+
100k
VOUT
4.5V
30F**
2.3V
30F**
2.3V
3125 TA06a
*TDK VLF4014ST-2R2M1R9
**PANASONIC EECHWOD306
Waveforms of Input Current, VOUT During Charging
VOUT
2V/DIV
SHDN
5V/DIV
LOAD CURRENT
200mA/DIV
VIN = 4.5V
VOUT = 4.5V
COUT_SERIES = 15F
L = 2.2μH
RPROG = 44.2k
20s/DIV
3125 TA06b
3125fa
14
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