April 1998•

4-129

MIC4576

MIC4576

Micrel

Ordering Information

Part Number

Voltage

Temperature Range

Package

MIC4576-3.3BT

3.3V

–40

°C to +85°C

5-lead TO-220

MIC4576-5.0BT

5.0V

–40

°C to +85°C

5-lead TO-220

MIC4576BT

Adjustable

–40

°C to +85°C

5-lead TO-220

MIC4576-3.3BU

3.3V

–40

°C to +85°C

5-lead TO-263

MIC4576-5.0BU

5.0V

–40

°C to +85°C

5-lead TO-263

MIC4576BU

Adjustable

–40

°C to +85°C

5-lead TO-263

Pin Configuration

5

SHDN

4FB

3

GND

2SW

5-Lead TO-220 (T)

5

SHDN

4FB

3

GND

2SW

5-Lead TO-263 (U)

Pin Description

Pin Number

Pin Name

Pin Function

1V

IN

Supply Voltage (Input): Unregulated +4V to +36V supply voltage.

2

SW

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

inductor and Shottky diode.

GND

Ground

4

FB

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.

5

SHDN

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

down regulator.