A5929: Automotive Full-Bridge MOSFET Driver


The A5929 is a full-bridge controller for use with N-channel external power MOSFETs and is specifically designed for automotive applications.

A unique charge pump regulator provides full (>10 V) gate drive at battery voltages down to 7 V and allows the A5929 to operate with reduced gate drive at battery voltages down to 5.5 V. A bootstrap capacitor is used to provide the above battery supply voltage required for n-channel MOSFETs.

One logic level input is provided for each of the four power MOSFETs in the full-bridge, allowing motors to be driven with any PWM scheme defined by an external controller. The power MOSFETs are protected from cross-conduction by integrated crossover control.

Motor phase short-to-supply and short-to-ground detection is provided by independent drain-source voltage monitors on each MOSFET. Short faults, supply undervoltage, and chip over-temperature conditions are indicated by a single open drain fault output.

The A5929 is supplied in a 24-pin TSSOP power package with an exposed thermal pad (package type LP). This package is available in lead (Pb) free versions, with 100% matte tin lead frame plating (suffix –T).

Top Features

  • High current Full-Bridge gate drive for n-channel MOSFETs
  • Cross-conduction protection
  • 5.5 V to 50 V Supply Voltage Range
  • Motor phase short to supply and short to ground detection
  • Undervoltage, overtemperature monitors
  • Low Current Sleep Mode

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
APEK5929KLP-01-T DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Distributor Stock
A5929KLPTR-T 24-lead TSSOP -40°C to 125°C Yes View Data Contact your
local sales rep
Distributor 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.