2002-2012 Microchip Technology Inc. DS21452C-page 1
TC652/TC653
Features
Integrated Temperature Sensing and Multi-speed
Fan Control
FanSense™ Fan Fault Detect Circuitry
Built-in Over-Temperature Alert (T
OVER
)
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
TC653 includes Auto Fan Shutdown
Low Operating Current: 50A (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
The "X" denotes a suffix for temperature threshold settings.
Contact factory for other temperature ranges.
Package Type
General Description
The TC652/TC653 are integrated temperature sensors
and brushless DC fan speed controllers with
FanSense
technology. The TC652/TC653 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.
The FanSense
Fan Fault detect circuitry eliminates
the need for a more expensive 3-wire fan.
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
TC652/TC653 also include a single trip point over
temperature alert (T
OVER
) that eliminates the need for
additional temperature sensors. In addition, the TC653
includes an auto fan shutdown function for additional
power savings.
The TC652/TC653 are easy to use, require no software
overhead and are therefore the ideal choice for
implementing thermal management in a variety of
systems.
Part Number Package Temperature Range
TC652XXVUA 8-Pin MSOP -40C to +125C
TC653XXVUA 8-Pin MSOP -40C to +125C
X Temperature
A25
B30
C35
D40
E45
F50
G55
1
8
2
7
3
6
4
5
FAULT
V
DD
MSOP
GND
PWM
T
OVER
SENSE
GND
TC652
TC653
SHDN
Integrated Temperature Sensor & Brushless DC Fan
Controller with FanSense™ Detect & Over-Temperature
TC652/TC653
DS21452C-page 2 2002-2012 Microchip Technology Inc.
Typical Application Diagram
1
8
2
7
3
6
4
5
FAULT
V
DD
PWM
GND
T
OVER
SENSE
R
SENSE
FanSense™
GND
GND
+5V V
DD
+12V
TC652
TC653
SHDN
2Ω
1k
0.01µF
C
SENSE
µController
DC Fan
300mA
Max.
SHDN Control
Over-Temp
Alert
Fan Fault Alert
2002-2012 Microchip Technology Inc. DS21452C-page 3
TC652/TC653
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage (V
DD
to GND) ...................................+6V
Output Voltage (OUT to GND) .................................6V
Voltage On Any Pin.......(GND – 0.3V) to (V
DD
+ 0.3V)
Package Thermal Resistance (
JA
) ...........250°C/W
Operating Temperature Range .........-40°C to +125°C
Storage Temperature .........................-65°C to +150°C
*Stresses above those listed under "Absolute Maximum Rat-
ings" may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at
these or any other conditions above those indicated in the
operation sections of the specifications is not implied. Expo-
sure to Absolute Maximum Rating conditions for extended
periods may affect device reliability.
TC652/TC653 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: V
DD
= 2.8V to 5.5V, SHDN = V
DD
, T
A
= -40C to 125C unless otherwise specified.
Symbol Parameter Min Typ. Max Units Test Conditions
V
DD
Supply Voltage 2.8 5.5 V
I
DD
Supply Current 50 90 APWM, FAULT, T
OVER
are
open
SHDN
Input
V
IH
SHDN Input High Threshold 65 %V
DD
V
IL
SHDN Input Low Threshold 15 %V
DD
PWM Output
V
OL
PWM Output Low Voltage 0.3 V I
SINK
= 1mA
V
OH
PWM Output High Voltage V
DD
– 0.5 V I
SOURCE
= 5mA
t
R
PWM Rise Time 10 sec I
OH
= 5mA, 1nF from
PWM to GND
t
F
PWM Fall Time 10 sec I
OL
= 1mA, 1nF from
PWM to GND
f
OUT
PWM Frequency 10 15 Hz
t
STARTUP
Start-up Time 32/f
OUT
—secV
DD
Rises from GND,
or SHDN
Released
V
TH (SENSE)
Sense Input 70 mV Sense Input Threshold
Voltage with Repect to
Ground
Temperature Accuracy
T
H ACC
High Temperature Accuracy T
H
- 3 T
H
T
H
+ 3 C Note 1
(T
H –
T
L
)
ACC
Temp. Range Accuracy -1.0 +1.0 C(T
H
– T
L
) 20C
-2.5 +2.5 C(T
H
– T
L
) 20C
T
HYST
Auto-shutdown Hysteresis (T
H
– T
L
)/5 C TC653 Only
FAULT
Output
V
HIGH
FAULT Output High Voltage V
DD
– 0.5 V I
SOURCE
= 1.2mA
V
LOW
FAULT Output Low Voltage 0.4 V I
SINK
= 2.5mA
tmp Missing Pulse Detector
Time-out
32/f
OUT
Sec
T
OVER
Output
V
HIGH
T
OVER
Output High Voltage V
DD
– 0.5 V I
SOURCE
= 1.2mA
V
LOW
T
OVER
Output Low Voltage 0.4 V I
SINK
= 2.5mA
T
OVER
ACC
Absolute Accuracy T
H
+ 10 °C At Trip Point
T
OVER HYST
Trip Point Hysteresis 5 °C
Note 1: Transition from 90% to 100% Duty Cycle.

TC652ACVUATR

Mfr. #:
Manufacturer:
Microchip Technology
Description:
Motor / Motion / Ignition Controllers & Drivers W/ Fan Flt & Over T
Lifecycle:
New from this manufacturer.
Delivery:
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