TC646BEOA Power Management ICs - PMIC by Microchip Technology

Status: Active
Series: TC646B
RoHS: Compliant
View Datasheet Manufacturer Site View Pricing & Stock

The TC646B is a new version of the existing TC646 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 TC646B also features Microchip Technology's proprietary FanSenseâ„¢ 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 TC646B 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. The FAULT signal is also asserted if the PWM reaches 100% duty cycle, indicating that maximum cooling capability has been reached and a possible thermal runaway condition exists.

Prices starting from US$1.22


Distributor Starting From Stock
Logo for Microchip Technology Microchip Technology US$1.22
2,187
Buy Now
Logo for Newark Electronics Newark Electronics US$1.42
287
Buy Now
Logo for Future Electronics Future Electronics US$1.40
-
Buy Now
Logo for Avnet America Avnet America US$1.72
-
Buy Now
Logo for RS Americas RS Americas US$2.38
-
Buy Now
View Full Pricing & Stock Comparison

Features

Temperature Proportional Fan Speed for Acoustic Control and Longer Fan Life
FanSenseâ„¢ 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
Over-Temperature Indication

Specifications

Device Description Fan Manager
Typical Accuracy (°C) Depends on external thermistor
Over Temp Alert True
SM Bus False
Predictive Fan Fault False
Max. Supply Current (µA) 400
Max Accuracy @ 25°C (°C) Depends on external thermistor
Integrated temp Sensor False
Fan Sense True
External Temp Input True
Auto Shutdown True
PWMFreq Low
FanSpeedTable No
Temp. Range Max. (°C) +85
Temp. Range. Min. (°C) -40
Vcc Range Max. (V) +5.5
Vcc Range Min. (V) +3.0
Pins | Packaging 8 | SOIC
Temp Range -40C to +85C
Packing Media Tube (100)

Resources





Environmental Information

JEDEC Indicator e3
ROHS Compliant
China EFUP Compliant
Device Weight (g) 0.078
Shipping Weight (kg) 0.25
Lead Count 8
Package Type SOIC
Package Width or Size .150In(3.90mm)
Soldering Composition Matte Tin

Alternative Descriptions

PWM Fan speed Controller | Microchip Technology
Pwm, Fan Speed Cntrl, Sd, 8-Soic | Newark Electronics
PWM, FAN SPEED CNTRL, SD, 8-SOIC | Farnell
TC646 Series 5.5 V PWM Fan Speed Controller w/ Fault Detection - SOIC-8 | Future Electronics
PWM Fan Motor Speed Controller 8-Pin SOIC N Tube | Avnet America
Microchip TC646BEOA, PWM Controller 34 Hz, 3 - 5.5 V, 8-Pin SOIC | Microchip Technology Inc. TC646BEOA | RS Americas


Frequently Asked Questions

Where can I find additional details, specifications and documents for a TC646BEOA?

Additional datasheets, footprints and schematics for TC646BEOA are listed on our Part Details page. You can also find images and similar parts to TC646BEOA on this page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for TC646BEOA on our Product Comparison page. Access via the 'View Pricing & Stock' button to view TC646BEOA price breaks, MOQs, lead times, inventory and SKUs from distributors.

What category does TC646BEOA fall under?

The TC646BEOA is listed under Semiconductors - ICs > Power Management ICs - PMIC > Drivers & Controllers > Motor Drivers / Controllers.

Can I view similar or alternative parts?

You can view similar parts to TC646BEOA when available in the Motor Drivers / Controllers range under the specifications section at the bottom of the details page.

Who can I contact for technical support of the product?

Submit any questions directly to the customer support team of the distributor listing the product. For the TC646BEOA you can contact the distributor directly for product support, shipping queries etc.

Is the TC646BEOA RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by Microchip Technology.

Which authorised distributors for TC646BEOA have stock available?

Authorised distributors including Microchip Technology, Newark Electronics, Farnell, Future Electronics and Avnet America have stock available or on a lead time for TC646BEOA.

How do I check stock and lead times for all distributors?

Stock availability and lead times will be displayed for TC646BEOA often in real-time on the comparison pages.

What if I can't find stock of TC646BEOA?

You can fill out our help required form which you can use to request a quote for TC646BEOA from some of our verified obsolescence suppliers. Alternatively, contact us via our web chat in the bottom left of your screen and one of our team will try to help.

We use cookies to improve your experience. See our privacy policy.
Okay