参数资料
型号: MIC2171WT
厂商: Micrel Inc
文件页数: 1/12页
文件大小: 0K
描述: IC REG MULTI CONFIG 2.5A TO220-5
标准包装: 50
类型: 降压(降压),升压(升压),反相,Cuk
输出数: 1
输入电压: 3 V ~ 40 V
PWM 型: 电流模式
频率 - 开关: 100kHz
电流 - 输出: 2.5A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 通孔
封装/外壳: TO-220-5
包装: 散装
供应商设备封装: TO-220-5
产品目录页面: 1092 (CN2011-ZH PDF)
其它名称: 576-2150
MIC2171WT-ND
MIC2171
100kHz 2.5A Switching Regulator
General Description
Features
The MIC2171 is a complete 100kHz SMPS current-mode
controller with an internal 65V 2.5A power switch.
Although primarily intended for voltage step-up applica-
tions, the floating switch architecture of the MIC2171
makes it practical for step-down, inverting, and Cuk config-
urations as well as isolated topologies.
Operating from 3V to 40V, the MIC2171 draws only 7mA
of quiescent current, making it attractive for battery
operated supplies.
The MIC2171 is available in a 5-pin TO-220 or TO-263 for
–40°C to +85°C operation.
Data sheets and support documentation can be found on
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2.5A, 65V internal switch rating
3V to 40V input voltage range
Current-mode operation, 2.5A peak
Internal cycle-by-cycle current limit
Thermal shutdown
Twice the frequency of the LM2577
Low external parts count
Operates in most switching topologies
7mA quiescent current (operating)
Fits LT1171/LM2577 TO-220 and TO-263 sockets
Micrel’s web site at: www.micrel.com.
Applications
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Laptop/palmtop computers
Battery operated equipment
Hand-held instruments
Off-line converter up to 50W(requires external power
switch)
? Pre-driver for higher power capability
___________________________________________________________________________________________________________
Typical Application
L1
15μH
V OU T
+12V, 0.25A
1N5822
R2
C2
GND
1.24k
470μF 1%
GND
+5V
(4.75V min.)
C1*
47μF
IN D1
SW
R1
MIC2171 10.7k
1%
COMP FB
R3
1k
C3
1μF
* Locate near MIC2171 when supply leads > 2”
V IN
4V to 6V
C1
47μF
IN
MIC2171
COMP
R3
1k
C2
1μF
R4*
SW
FB
T1
C3*
D1*
1:1.25
L P R I = 12μH
D2
1N5818
V OU T
5V, 0.5A
R1
C4 3.74k
470μF 1%
R2
1.24k
1%
* Optional voltage clipper (may be req’d if T1 leakage inductance too high)
Figure 1. MIC2171 5V to 12V Boost Converter
Figure 2. MIC2171 5VFlyback Converter
Micrel Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel +1 ( 408 ) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
May 2007
1
M9999-051107
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