A3944: Automotive, Low-Side FET Pre-Driver

The A3944 is a programmable 6 channel low-side MOSFET pre-driver suitable for use in automotive applications. Each channel is controllable by a combination of parallel and serial inputs and provides sufficient gate drive current to allow PWM control up to 10 kHz, depending on the MOSFET gate charge.

Each channel provides independent fault diagnostics for short to ground and open load when in the off-state, and short to battery when in the on-state. A short to battery can disable the output until reset or for a programmable retry time. Each channel provides independently programmable fault thresholds and blanking times.

In addition to channel state control, channel fault masking, fault thresholds and fault timers are programmed through the SPI compatible serial interface. The serial interface also provides read back of the fault status for each channel.

Digital inputs and outputs are compatible with 3.3 and 5 V supplies.

The A3944 is supplied in a 28 lead TSSOP package (suffix LP) with an exposed thermal pad. The package is lead (Pb) free with 100% matte-tin leadframe plating.


  • Automotive ECU
  • Automotive high-side actuators

Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

If this is not your local representative, find your local sales rep here.

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  • 6 channels
  • Drives logic-level N-channel MOSFETs
  • 50 mA gate drive current
  • Short and open detection
  • High voltage (50 V) drain feedback inputs
  • Programmable fault timers and thresholds per channel
  • UVLO and thermal warning circuitry
  • Serial or parallel gate drive control
  • Highly configurable, through SPI compatible interface
  • Compact TSSOP package

The A3944 is supplied in a 28 lead TSSOP package (suffix LP) with an exposed thermal pad. The package is lead (Pb) free with 100% matte-tin leadframe plating.


Design Support Tools

NOTE: When ordering, please also request APEK-USBCBLE-T.

Click the image to view larger
Product Image Functional Block Diagram Typical Application

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
APEK3944KLP-01-T DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Check Stock
A3944KLPTR-T 28-lead TSSOP -40°C to 125°C Yes View Data Contact your
local sales rep
Check Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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