LTC3125 Linear Technology, LTC3125 Datasheet - Page 12

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LTC3125

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

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TYPICAL APPLICATIONS
LTC3125
12
PC Card or CompactFlash (3.3V/500mA Maximum) 4.5V Output, GSM Pulsed Load
PC CARD V
1000mA MAX
PC CARD V
500mA MAX
3.3V ±10%
3.3V ±10%
PC Card (3.3V/1000mA Maximum) 4.5V Output, GSM Pulsed Load
V
V
CC
IN
CC
IN
INPUT CURRENT
INPUT CURRENT
LOAD CURRENT
Waveforms of Input Current, V
Waveforms of Input Current, V
LOAD CURRENT
100mV/DIV
500mA/DIV
100mV/DIV
200mA/DIV
2A/DIV
2A/DIV
10μF
CER
V
10μF
CER
V
OUT
OUT
OFF ON
OFF ON
22.6k
44.2k
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
= 4.5V
= 4.4mF
= 4.5V
= 4.4mF
= 22.6k
= 44.2k
V
SHDN
PROG
V
SHDN
PROG
CS
IN
CS
IN
LTC3125
LTC3125
2.7μH*
2.2μH*
GND
GND
1ms/DIV
1ms/DIV
V
**VISHAY 592D228X6R3X220H
V
**VISHAY 592D228X6R3X220H
SW
OUT
*WURTH 7440420027
SW
*COILTRONICS SD3118-2R2-R
OUT
FB
FB
OUT
OUT
for Pulsed Load Current
for Pulsed Load Current
2.74M
1M
2.74M
1M
3125 TA02a
3125 TA03a
3125 TA03b
3125 TA02b
2200μF**
55mΩ
TANT
2200μF**
55mΩ
TANT
V
4.5V, 2A PULSED LOAD
(577μs PW, 4.6ms PERIOD)
V
4.5V, 2A PULSED LOAD
(577μs PW, 4.6ms PERIOD)
2
2
OUT
OUT
3125f

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