TC650/TC651
Tiny Integrated Temperature Sensor & Brushless DC Fan
Controller with Over-Temperature Alert
Features
• Integrated Temperature Sensing and Multi-speed
Fan Control
• Built-in Over Temperature Alert (TOVER)
• Temperature Proportional Fan Speed Control for
Acoustic Noise Reduction and Longer Fan Life
• Pulse Width Modulation Output Drive for Cost and
Power Savings
• Solid-State Temperature Sensing
• ±1°C (Typical) Accuracy from 25°C to +70°C
• 2.8V – 5.5V Operating Range
• TC651 includes Auto Fan Shutdown
• Low Operating Current: 50µA (Typical)
Applications
• Thermal Protection For Personal Computers
• Digital Set-Top Boxes
• Notebook Computers
• Data Communications
• Power Supplies
• Projectors
Related Literature
• Application Note: AN771
Device Selection Table
Part Number Package
TC650XXVUA 8-Pin SOIC
TC651XXVUA 8-PinMSOP
Temperature
Range
-40°C to +125°C
-40°C to +125°C
Package Type
8-Pin MSOP
8-Pin SOIC
VDD 1
NC 2
SHDN 3
GND 4
TC650
TC651
8 PWM
7 GND
6 TOVER
5 NC
General Description
The TC650/TC651 are integrated temperature sensors
and brushless DC fan speed controllers. The TC650/
TC651 measure their junction temperature and control
the speed of the fan based on that temperature, making
them especially suited for applications in modern
electronic equipment.
Temperature data is converted from the on-chip
thermal sensing element and translated into a
fractional fan speed from 40% to 100%. A temperature
selection guide in the data sheet is used to choose the
low and high temperature limits to control the fan. The
TC650/TC651 also include a single trip point over
temperature alert (TOVER) that eliminates the need for
additional temperature sensors. In addition, the TC651
features an auto fan shutdown function for additional
power savings.
The TC650/TC651 are easy to use, require no software
overhead and are therefore the ideal choice for
implementing thermal management in a variety of
systems.
X Temperature
A 25
B 30
C 35
D 40
E 45
F 50
G 55
The "X" denotes a suffix for temperature threshold settings.
Contact factory for other temperature ranges.
© 2002 Microchip Technology Inc.
DS21450B-page 1
