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TC650AGVUA

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
2001-2012 Microchip Technology Inc. DS21450D-page 1
TC650/TC651
Features
• Integrated Temperature Sensing and Multi-speed
Fan Control
• Built-in Overtemperature Alert (T
OVER
)
• Temperature-proportional Fan Speed Control for
Acoustic Noise Reduction and Longer Fan Life
• Pulse Width Modulation (PWM) Output Drive for
Cost and Power Savings
• Solid-state Temperature Sensing
•±1C (typ.) Accuracy from 25C to +70C
• Operating Range: 2.8V – 5.5V
• TC651 includes Automatic Fan Shutdown
• Low Operating Current: 50 µA (typ.)
Applications
• Thermal Protection For Personal Computers
• Digital Set-Top Boxes
• Notebook Computers
• Data Communications
• Power Supplies
•Projectors
Related Literature
• Application Note 771 (DS00771)
General Description
The TC650/TC651 are integrated temperature sensors
and brushless DC fan speed controllers. The TC650/
TC651 measure the 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.
Package Type
1
8
27
3
6
4
5
NC
V
DD
PWM
T
OVER
NC
GND
8-Pin MSOP
SHDN
GND
TC650
TC651
Tiny Integrated Temperature Sensor & Brushless DC Fan
Controller with Overtemperature Alert
TC650/TC651
DS21450D-page 2 2001-2012 Microchip Technology Inc.
Typical Application Circuit
1
8
27
3
6
4
5
NC
V
DD
C
SLOW
PWM
GND
T
OVER
NC
GND
GND
+5V V
DD
+12V
TC650
TC651
SHDN
GND
PIC
®
DC Fan
500 mA
SHDN
Control
Overtemperature
Alert
Microcontroller
2001-2012 Microchip Technology Inc. DS21450D-page 3
TC650/TC651
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)
Operating Temperature Range .........–40C to +125C
Storage Temperature ........................–65C to +150C
† Notice: Stresses above those listed under "Absolute Maxi-
mum Ratings" 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.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise specified, V
DD
= 2.8V to 5.5V, SHDN = V
DD
, T
A
= –40C to +125C.
Parameters Sym Min Typ Max Units Conditions
Supply Voltage V
DD
2.8 — 5.5 V
Supply Current I
DD
—5090µAPWM, T
OVER
are open
SHDN
Input
SHDN
Input High Threshold V
IH
65 — — %V
DD
SHDN Input Low Threshold V
IL
——15%V
DD
PWM Output
PWM Output Low Voltage V
OL
— — 0.3 V I
SINK
= 1 mA
PWM Output High Voltage V
OH
V
DD
– 0.5 — — V I
SOURCE
= 5 mA
PWM Rise Time t
R
—10 — µsI
OH
= 5 mA, 1 nF from
PWM to GND
PWM Fall Time t
F
—10 — µsI
OL
= 1 mA, 1 nF from
PWM to GND
PWM Frequency f
OUT
10 15 — Hz
Start-up Time t
STARTUP
— 32/f
OUT
—secV
DD
Rises from GND
or SHDN
Released
Temperature Accuracy
High Temperature Accuracy T
H ACC
T
H
– 3 T
H
T
H
+ 3 °C Note 1
Temperature Range Accuracy (T
H –
T
L
)
ACC
–1.0 — +1.0 °C (T
H
– T
L
) 20C
–2.5 — +2.5 °C (T
H
– T
L
) 20C
Auto-shutdown Hysteresis T
HYST
—(T
H
-T
L
)/5 — °C TC651 Only
T
OVER
Output
T
OVER
Output High Voltage V
HIGH
V
DD
– 0.5 — — V I
SOURCE
= 1.2 mA
T
OVER
Output Low Voltage V
LOW
— — 0.4 V I
SINK
= 2.5 mA
Absolute Accuracy T
OVER ACC
—T
H
+ 10 — °C At Trip Point
Trip Point Hysteresis T
OVER HYST
—5—°C
Note 1: Transition from 90% to 100% Duty Cycle.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

TC650AGVUA

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Description:
Board Mount Temperature Sensors W/ Over Temp Alert
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