Micrel, Inc.

MIC502

November 2006

2

M9999-112206

Ordering Information

Part Number

Temperature Range

Package

Lead Finish

MIC502BN

–40° to +85°C

8-Pin Plastic DIP

Standard

MIC502YN

–40° to +85°C

8-Pin Plastic DIP

Pb-Free

MIC502BM

–40° to +85°C

8-Pin SOIC

Standard

MIC502YM

–40° to +85°C

8-Pin SOIC

Pb-Free

Pin Configuration

1

2

3

4

8

7

6

5

VDD

OUT

OT F

VT2

VT1

CF

VSLP

GND

8-Pin SOIC (M)

8-Pin DIP (N)

Pin Description

Pin Number

Pin Name

Pin Function

1

VT1

produces active duty cycle of 0% to 100% at driver output (OUT). Connect to

external thermistor network (or other temperature sensor). Pull low for shutdown.

2

CF

PWM Timing Capacitor (External Component): Positive terminal for the PWM

30Hz PWM operation.

3

VSLP

Sleep Threshold (Input): The voltage on this pin is compared to VT1 and VT2.

mode function.

4

GND

Ground.

5

VT2

produces active duty cycle of 0% to 100% at driver output (OUT). Connect to

motherboard fan control signal or second temperature sensor.

6

/OTF

Overtemperature Fault (Output): Open-collector output (active low).Indicates

7

OUT

Driver Output: Asymmetrical-drive active-high complimentary PWM output.

Typically connect to base of external NPN motor control transistor.

8

VDD

Power Supply (Input): IC supply input; may be independent of fan power supply.