LTC3125 Linear Technology, LTC3125 Datasheet - Page 13

• Manufacturer Part Number: LTC3125
• Description: 1.2A Synchronous Step-Up DC/DC Converter
• Manufacturer: Linear Technology

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TYPICAL APPLICATIONS
PC CARD V
1000mA MAX
3.3V ±10%
PC Card (3.3V/1000mA Maximum) 4.5V Output, GPRS, Class 10 Pulsed Load
V
CC
IN
1000mA MAX
INPUT CURRENT
INPUT CURRENT
LOAD CURRENT
LOAD CURRENT
Waveforms of Input Current, V
Waveforms of Input Current, V
3.3V ±10%
100mV/DIV
500mA/DIV
500mA/DIV
500mV/DIV
10μF
CER
V
2A/DIV
1A/DIV
IN
V
V
OFF ON
OUT
22.6k
OUT
V
V
C
L = 2.7μH
R
V
V
C
L = 2.2μH
R
IN
OUT
OUT
PROG
IN
OUT
OUT
PROG
= 3.3V
= 3.3V
10μF
CER
= 4.5V
= 6.6mF
= 2.5V
= 10F
= 22.6k
= 22.6k
V
SHDN
PROG
Single Supercap Charger
CS
IN
OFF ON
22.6k
LTC3125
2.7μH*
GND
**VISHAY 592D228X6R3X220H
V
*WURTH 7440420027
SW
OUT
200ms/DIV
FB
1ms/DIV
V
SHDN
PROG
CS
IN
LTC3125
2.2μH*
GND
OUT
OUT
2.74M
1M
**COOPER B1325-2R5106-R
V
for Pulsed Load Current
for Pulsed Load Current
SW
*COILTRONICS SD3118-2R2-R
OUT
FB
3125 TA04a
3125 TA05a
1.07M
1M
3125 TA04b
3125 TA05b
2200μF**
55mΩ
TANT
V
4.5V, 2A PULSED LOAD
(1154μs PW, 4.6ms PERIOD)
3
OUT
SC**
10F
60mΩ
V
2.5V
OUT
LTC3125
13
3125f