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| 型号： | LTC3125EDCB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 1.2A 8DFN |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2 V ~ 5.25 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.6MHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN（3x2） |
LTC3125
1.2A Synchronous Step-Up
DC/DC Converter with
Input Current Limit
FEATURES
DESCRIPTION
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Programmable Average Input Current Limit
5% Input Current Accuracy
200mA to 1000mA Program Range
V IN : 1.8V to 5.5V, V OUT : 2V to 5.25V
Supports High Current GSM/GPRS Load Burst
V IN > V OUT Operation
1.6MHz Fixed Frequency Operation
Internal Current Sense Resistor
1.2A Peak Current Limit
Up to 93% Ef?ciency
Output Disconnect in Shutdown
Soft-Start
Low Quiescent Current Burst Mode ? Operation
Available in 2mm × 3mm × 0.75mm DFN Package
The LTC ? 3125 is a high ef?ciency, synchronous step-up
DC/DC converter with an accurate programmable average
input current limit. The resistor programmable average
input current limit is 5% accurate at 500mA and is suitable
for a wide variety of applications. In mobile computing,
GSM and GPRS cards demand high current pulses well
beyond the capability of the PC Card and CompactFlash
slots. The LTC3125 in concert with a reservoir capacitor,
keeps the slot power safely within its capabilities providing
a high performance and simple solution.
Synchronous recti?cation produces high ef?ciency while
the 1.6MHz switching frequency minimizes the solution
footprint. The current mode PWM design is internally com-
pensated. Output disconnect allows the load to discharge in
APPLICATIONS
shutdown, while also providing inrush current limiting.
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GSM/GPRS PCMCIA/CompactFlash PC Card Modems
Wireless Emergency Locators
Portable Radios
Supercap Chargers
Other features include a <1μA shutdown current, short-
circuit and thermal overload protection. The LTC3125 is
offered in a low pro?le 0.75mm × 2mm × 3mm package.
L , LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
PCMCIA/CompactFlash (3.3V/500mA Max),
Ef?ciency vs Load Current
4V GSM Pulsed Load
2.2μH
100
90
80
1
V IN
3.3V
500mA
10μF
CER
OFF ON
V IN V OUT
LTC3125
SHDN
CS SW
1.24M
V OUT
4V
2A PULSED LOAD
2200μF
70
60
50
0.1
2
40
PROG
FB
TANT
30
0.01
44.2k
GND
536k
3125 TA01a
20
V OUT = 4V
10
0
0.001
0.01 0.1
V IN = 3.3V
V IN = 2.4V
1
0.001
LOAD CURRENT (A)
3125 TA01b
3125fa
1
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