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TC649B

Status: In Production

Features:

  • Temperature Proportional Fan Speed for Acoustic Control and Longer Fan Life
  • FanSense™ Protects Against Fan Failure
  • Efficient PWM Drive
  • Automatic Shutdown Mode for "Green" Systems
  • 3.0V to 5.5V Supply Range
  • Fan Voltage Independent of Supply Voltage – Supports Any Fan Voltage
  • Supports Low Cost NTC/PTC Thermistors
  • Fan Auto-Restart
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

The TC649B is a new version of the existing TC649 fan speed controller. This device is a switch mode fan speed controller, which incorporates a new fan auto restart function. Temperature proportional speed control is accomplished using pulse width modulation. A thermistor (or other voltage output temperature sensor) connected to the VIN input supplies the required control voltage of 1.20V to 2.60V (typical) for 0% to 100% PWM duty cycle. The auto-shutdown speed is set by a simple resistor divider on the VAS input. An integrated Start-Up Timer ensures reliable fan motor start-up at turn-on, coming out of shutdown mode, auto-shutdown mode, or following a transient fault. A logic low applied to VIN, pin 1, causes fan shutdown.

The TC649B also features Microchip Technology's proprietary FanSense™ technology for increasing system reliability. In normal fan operation, a pulse train is present at SENSE, pin 5. A missing-pulse detector monitors this pin during fan operation. A stalled, open, or unconnected fan causes the TC649B device to turn the VOUT output on full (100% duty cycle). If the fan fault persists (a fan current pulse is not detected within a 32/F period), the FAULT output goes low. Even with the FAULT output low, the VOUT output is on full during the fan fault condition in order to try and restart the fan.

Additional Features
    • Temperature Proportional Fan Speed for Acoustic Control and Longer Fan Life
    • FanSense™ Protects Against Fan Failure
    • Efficient PWM Drive
    • Automatic Shutdown Mode for "Green" Systems
    • 3.0V to 5.5V Supply Range
    • Fan Voltage Independent of Supply Voltage – Supports Any Fan Voltage
    • Supports Low Cost NTC/PTC Thermistors
    • Fan Auto-Restart
Parametrics
Name
Value
Device Description
Fan Manager
Typical Accuracy (°C)
Depends on external thermistor
Over Temp Alert
yes
Max. Supply Current (µA)
400
Max. Accuracy @ 25°C (°C)
Depends on external thermistor
Fan Sense
Yes
External Temp Input
Yes
Auto Shutdown
Yes
High/Low PWM Freq
Low
Temp Range (°C)
-40 to +85
Vcc Range (V)
+3.0 to +5.5

Documents

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Data Sheets


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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
TC649BEUA
0.025600
0.070000
8
MSOP
3x3mm
Matte Tin
e3
TC649BEUATR
0.025600
0.215600
8
MSOP
3x3mm
Matte Tin
e3
TC649BEOA
0.078000
0.250000
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC649BEOATR
0.078000
0.230303
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC649BEPA
0.486700
0.900000
8
PDIP
.300in
Matte Tin
e3
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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