TC650/TC651
Tiny Integrated Temperature Sensor & Brushless DC Fan
Controller with Over-Temperature Alert
Features
鈥?Integrated Temperature Sensing and Multi-speed
Fan Control
鈥?Built-in Over Temperature Alert (T
OVER
)
鈥?Temperature Proportional Fan Speed Control for
Acoustic Noise Reduction and Longer Fan Life
鈥?Pulse Width Modulation Output Drive for Cost and
Power Savings
鈥?Solid-State Temperature Sensing
鈥?鹵1擄C (Typical) Accuracy from 25擄C to +70擄C
鈥?2.8V 鈥?5.5V Operating Range
鈥?TC651 includes Auto Fan Shutdown
鈥?Low Operating Current: 50碌A(chǔ) (Typical)
Package Type
8-Pin MSOP
8-Pin SOIC
V
DD
1
NC 2
SHDN 3
GND 4
8 PWM
TC650
TC651
7 GND
6 T
OVER
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 (T
OVER
) 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.
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Thermal Protection For Personal Computers
Digital Set-Top Boxes
Notebook Computers
Data Communications
Power Supplies
Projectors
Related Literature
鈥?Application Note: AN771
Device Selection Table
Part Number
TC650XXVUA
TC651XXVUA
Package
8-Pin SOIC
8-PinMSOP
Temperature
Range
-40擄C to +125擄C
-40擄C to +125擄C
X
A
B
C
D
E
F
G
Temperature
25
30
35
40
45
50
55
The "X" denotes a suffix for temperature threshold settings.
Contact factory for other temperature ranges.
2002 Microchip Technology Inc.
DS21450B-page 1
漏
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