MIC2171

Micrel

4-4

1997

Ordering Information

Part Number

Temperature Range

Package

MIC2171BT

–40

°C to +85°C

5-lead TO-220

MIC2171BU

–40

°C to +85°C

5-lead TO-263

5-lead TO-263 (BU)

5-lead TO-220 (BT)

Tab GND

5IN

4SW

3 GND

2FB

1 COMP

Pin Configuration

Tab GND

5IN

4SW

3 GND

2FB

1 COMP

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