Datasheet > MIC2171_07

MIC2171_07

更新时间： 2024-02-18 16:13:13

品牌	Logo	应用领域
麦瑞 - MICREL		稳压器开关
页数	文件大小	规格书
12页	186K
描述
100kHz 2.5A Switching Regulator

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MIC2171_07 数据手册

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.

• 2.5A, 65V internal switch rating

• 3V to 40V input voltage range

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.

• 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

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

Micrel’s web site at: www.micrel.com.

Applications

• 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

+5V

V_OUT

5V, 0.5A

V_IN

4V to 6V

(4.75V min.)

C1*

15µH

1N5818

R4*

C3*

47µF

V_OUT

+12V, 0.25A

470µF

3.74k

D1*

10.7k

1N5822

MIC2171

COMP

1:1.25

L_PRI= 12µH

MIC2171

470µF

GND

COMP

GND

1.24k

1µF

1.24k

1µF

* Locate near MIC2171 when supply leads > 2”

* 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

M9999-051107

May 2007

12 3 4 5 6 7...12

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