MIC502 datasheet(2/15 Pages) MICREL

2 / 15 page

Micrel, Inc.

MIC502

November 2006

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

VDD

OUT

OT F

VT2

VT1

VSLP

GND

8-Pin SOIC (M)

8-Pin DIP (N)

Pin Description

Pin Number

Pin Name

Pin Function

VT1

Thermistor 1 (Input): Analog input of approximately 30% to 70% of VDD

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.

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

triangle-wave generator timing capacitor. The recommended CF is 0.1µF for

30Hz PWM operation.

VSLP

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

When VT1 < VSLP and VT2 < VSLP the MIC502 enters sleep mode until VT1 orVT2

rises above VWAKE. (VWAKE = VSLP + VHYST). Grounding VSLP disables the sleep-

mode function.

GND

Ground.

VT2

Thermistor 2 (Input): Analog input of approximately 30% to 70% of VDD

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

motherboard fan control signal or second temperature sensor.

/OTF

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

overtemperature fault condition (VT1 > VOT) when active.

OUT

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

Typically connect to base of external NPN motor control transistor.

VDD

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

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