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参数资料
| 型号： | LTC3125EDCB#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1900 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 2 X 2 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, DFN-8 |
| 文件页数： | 4/18页 |
| 文件大小： | 303K |
| 代理商： | LTC3125EDCB#PBF |
LTC3125
12
3125fa
PC Card (3.3V/1000mA Maximum) 4.5V Output, GSM Pulsed Load
CS
2.7μH*
LTC3125
GND
VIN
2.74M
2200μF**
2
55mΩ
TANT
10μF
CER
VOUT
4.5V, 2A PULSED LOAD
(577μs PW, 4.6ms PERIOD)
VIN
PC CARD VCC
3.3V ±10%
1000mA MAX
1M
3125 TA03a
SHDN
PROG
VOUT
FB
22.6k
SW
OFF ON
*WURTH 7440420027
**VISHAY 592D228X6R3X220H
Waveforms of Input Current,
VOUT for Pulsed Load Current
VOUT
100mV/DIV
INPUT CURRENT
500mA/DIV
LOAD CURRENT
2A/DIV
1ms/DIV
VIN = 3.3V
VOUT = 4.5V
COUT = 4.4mF
L = 2.7μH
RPROG = 22.6k
3125 TA03b
AVERAGE INPUT ILIMIT PROGRAMMING RESISTOR
SELECTION
The input current limit is user programmable by selection
of an external resistor, RPROG. It is important to locate
the resistor as close to the pin as possible to minimize
capacitance and noise pick-up. Resistor tolerance directly
affects the current limit accuracy so it must be factored in
to the application requirements. Table 3 shows standard
resistors for typical current limit values. Also refer to the
graph, “Average Input Current vs RPROG”, in the Typical
Performance Characteristics section of this datasheet.
APPLICATIONS INFORMATION
Table 3.
STANDARD 1% RESISTOR VALUE
(K)
TYPICAL APPLICATION
INPUT LIMIT (A)
22.1
1.001
24.9
0.890
28.0
0.791
29.4
0.750
31.6
0.699
37.4
0.588
54.9
0.393
71.5
0.295
82.5
0.252
For most applications the loss in accuracy from standard
1% resistors is tolerated but for critical applications the
use of 0.1% resistors is recommended.
TYPICAL APPLICATIONS
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| LTC3127EDD#PBF | 功能描述:IC BUCK BOOST SYNC ADJ 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 应用:热电冷却器 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.173"，4.40mm 宽）裸露焊盘 供应商设备封装:28-TSSOP 裸露焊盘 包装:管件 产品目录页面:1410 (CN2011-ZH PDF) |
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