Microchip TC653 Manual

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The TC650 TC651 TC652 TC653, , , and are fan speed

controller products with built-in temperature sensor.

The are pulse widthTC650,TC651, TC652, and TC653

modulation (PWM) fan speed controllers for DC brushless

fans. These devices adjust the speed of the fan according

to the temperature level, therefore reducing acoustic

noise, minimizing power consumption, and extending fan

life. Temperature data from an on-board temperature

sensor is translated into a fractional speed from 40% to

100%. The TC65X family features a PWM frequency of

15Hz. These devices offer a typical accuracy of 1°C with±

a low typical operating current of 50 µA.

The devices are fully specified from 2.8V to 5.5V over the

-40°C to +125°C temperature range. A variety of features

address a broad application spectrum: shutdown mode

for further power savings, FanSense™ technology for fan

fault detection, auto-shutdown for automatic fan shut-off,

minimum fan speed for constant cooling, and over-

temperature alert for overheating detection. All devices

are available in small 8-pin MSOP packages.

These devices are ideal for every application utilizing DC

fans, especially where acoustic noise and fan reliability

are very important. Applications may include computers,

projectors, servers, datacom equipment, telecom

equipment, power supplies, set-top boxes, fan racks, and

test equipment.

Features:

•Temperature proportional fan speed control

•FanSense™ technology protects against fan and

system failure

•2.8V to 5.5V supply voltage range

•Low 50µA operating current

•±1°C typical accuracy

•15Hz pulse width modulation (PWM) frequency

•Shutdown mode

•Built-in over-temperature alert

•Temperature range: -40°C to +125°C

•8-Pin MSOP package

Related Application Notes:

•AN58 Suppressing Acoustic Noise in Pulse Width

Modulation (PWM) Fan Speed Control

Systems

•AN59 Speed Error in Pulse Width Modulation

(PWM) Fan Control Systems

M i c r o c h i p T e c h n o l o g y I n c . •T h e E m b e d d e d C o n t r o l S o l u t i o n s C o m p a n y ®

TC65X Fan Speed Controller Family

Product Information

Additional Information:

•Microchip's web site: www.microchip.com

•Microchip's Technical Library CD-ROM, Order No. DS00161

•Analog Interface Handbook, Order No. DS00207

•Product Line Card, Order No. DS00148

•Analog Design Pack CD-ROM, Order No. DS51205

Related Tools:

•TC650DEMO Development System DS21453

•TC652DEMO Development System DS21506

TC65X Fan Speed Controller Family

# of Pins/ PWM Typical

Product VCC Range Temperature Package Maximum I QFrequency Accuracy

TC650 2.8V to 5.5V –40°C to +125°C 8MS 90µA 15Hz ±1°C

TC651 2.8V to 5.5V –40°C to +125°C 8MS 90µA 15Hz ±1°C

TC652 2.8V to 5.5V –40°C to +125°C 8MS 90µA 15Hz ±1°C

TC653 2.8V to 5.5V –40°C to +125°C 8MS 90µA 15Hz ±1°C

Package Key: MS = MSOP

TC65X Fan Speed Controller Family Continued

The Microchip name and logo, and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. FanSense is a trademark of Microchip Technology Inc.