MIC4574

Micrel, Inc.

M9999-062105

2

June 2005

Ordering Information

Part Number

Temperature

Standard

Pb-Free

Voltage

Range

Package

MIC4574-3.3BN

MIC4574-3.3YN

3.3V

–40°C to +85°C

8-pin DIP

MIC4574-5.0BN

MIC4574-5.0YN

5.0V

–40°C to +85°C

8-pin DIP

MIC4574BN

MIC4574YN

Adjustable

–40°C to +85°C

8-pin DIP

Pin Description

Pin Number

Pin Name

Pin Function

1FB

Feedback (Input): Output voltage feedback to regulator. Connect to output

of supply for fixed versions. Connect to 1.23V tap of resistive divider for

adjustable versions.

2

SGND

Signal Ground.

3

SHDN

Shutdown (Input): Logic low enables regulator. Logic high (> 2.4V) shuts

down regulator.

4

PGND

Power Ground.

5

VIN

Supply Voltage (Input): Unregulated +4V to +24V supply voltage.

7SW

Switch (Output): Emitter of NPN output switch. Connect to external storage

inductor and Shottky diode.

6, 8

NC

Not internally connected. Solder to printed circuit for maximum heat transfer.

Pin Configuration

1

2

3

4

8

7

6

5

FB

SGND

SHDN

PGND

NC

SW

NC

8-Pin DIP (N)