Micrel, Inc.

MIC2171

May 2007

2

M9999-051107

Ordering Information

Part Number

Standard

RoHS Compliant*

Temperature Range

Package

MIC2171BT

MIC2171WT

–40° to +85°C

5-Pin TO-220

MIC2171BU

MIC2171WU

–40° to +85°C

5-Pin TO-263

*RoHS compliant with "high-melting solder" exemption.

Pin Configuration

Tab GND

5IN

4SW

3GND

2FB

1COMP

Tab GND

5 IN

4SW

3GND

2FB

1COMP

5-Pin TO-220 (T)

5-Pin TO-263 (U)

Pin Description

Pin Number

Pin Name

Pin Function

1

COMP

Frequency Compensation: Output of transconductance-type error amplifier.

Primary function is for loop stabilization. Can also be used for output voltage

soft-start and current limit tailoring.

2

FB

Feedback: Inverting input of error amplifier. Connect to external resistive divider

to set power supply output voltage.

3

GND

Ground: Connect directly to the input filter capacitor for proper operation (see

applications info).

4

SW

Power Switch Collector: Collector of NPN switch. Connect to external inductor

or input voltage depending on circuit topology.

5

IN

Supply Voltage: 3.0V to 40V