TC651

Features:

• Integrated Temperature Sensing and Multi-speed Fan Control
• Built-in Over Temperature Alert (T_OVER)
• Temperature Proportional Fan Speed Control for Acoustic Noise Reduction and Longer Fan Life
• PulseWidth Modulation Output Drive for Cost and Power Savings
• Solid-State Temperature Sensing
• ±1°C (Typical) Accuracy from 25to +70
• 2.8V 5.5V Operating Range
• TC651 includes Auto Fan Shutdown
• Low Operating Current: 50µA (Typical)




Application

• Thermal Protection For Personal Computers
• Digital Set-Top Boxes
• Notebook Computers
• Data Communications
• Power Supplies
• Projectors




Pinout






Specifications

Parameter Name	Value
Typical Accuracy (°C)	1
Over Temp Alert	yes
SM Bus	NO
Predictive Fan Fault	NO
Max. Supply Current (A)	90
Max. Accuracy @ 25°C (°C)	3
Integrated Temp Sensor	Yes
Fan Sense	No
External Temp Input	No
Auto Shutdown	Yes
Device Description	Fan Manager
Temp Range (°C)	-40 to +125
Vcc Range (V)	+2.8 to +5.5

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/W
Operating Temperature Range ............. -40 to +125
Storage Temperature ........................... -65 to +150

*Stresses above those listed under "Absolute Maximum 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.

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, and require no software overhead, and are therefore the ideal choice for implementing thermal management in a variety of systems.