Micrel, Inc.

MIC4685

January 2010

2

M9999-012610

Ordering Information

Part Number

Standard

RoHS Compliant*

Voltage

Junction

Temp. Range

Package

MIC4685BR

MIC4685WR

Adj.

–40° to +125°C

7-Pin SPAK

MIC4685WR EV

Adj.

Evaluation Board

*

RoHS compliant with ‘high-melting solder’ exemption.

Pin Configuration

7NC

6SW

5EN

4GND

3FB

2IN

1BS

7-Pin SPAK (R)

Pin Description

Pin Number

Pin Name

Pin Function

1

BS

Bootstrap Voltage Node (External Component): Connect to external boost

capacitor.

2

IN

Supply (Input): Unregulated +4V to 30V supply voltage (34V transient)

3

FB

Feedback (Input): Outback voltage feedback to regulator. Connect to 1.235V

tap of resistive divider.

4, Tab

GND

Ground

5

EN

Enable (Input): Logic high = enable; logic low = shutdown

6

SW

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

inductor and Schottky diode.

7

NC

No Connect. Tie this pin-to-ground.