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MIC502

Fan Management IC

Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 9440800 • fax + 1 (408) 4741000 • San --http://www.micrel.com

October

6 , 2014

Revision 3.0

General Description

The MIC502 is a thermal and fan management IC that

supports the features for NLX/ATX power supplies and

other control applications.

Fan speed is determined by an external temperature

sensor, typically a thermistorresistor divider, and -

(optionally) a second signal, such as the NLX “FanC”

signal. The MIC502 produces a lowfrequency pulse--width

modulated output for driving an external motor drive

transistor. Lowuency PWM speed control allows -freq

operation of standard brushless DC fans at low duty-cycle

for reduced acoustic noise and permits the use of a very

small power transistor. The PWM time base is determined

by an external capacitor.

An opencollector overtemperature fault output is asserted -

if the primary control input is driven above the normal

control range.

The MIC502 features a lowpower sleep mode with a user--

determined threshold. Sleep mode completely turns off the

fan and occurs when the system is asleep or off (both

control inputs very low). A complete shutdown or reset can

also be initiated by external circuitry as desired.

The MIC502 is available as 8-pin plastic DIP and SOIC

packages in the 40°C to +85°C industrial temperature –

range.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com

.

Features

•- Temperatureproportional fan speed control

•- Lowcost, efficient PWM fan drive

• 4.5V to 13.2V IC supply range

• Controls any voltage fan

• Overtemperature detection with fault output

• Integrated fan startup timer

•- Automatic userspecified sleep mode

•- Supports lowcost NTC/PTC thermistors

•8- pin DIP and SOIC packages

Applications

• NLX and ATX power supplies

• Personal computers

• File servers

• Telecom and networking hardware

• Printers, copiers, and office equipment

• Instrumentation

• Uninterruptible power supplies

• Power amplifiers

Typical Application

Produktspecifikationer