A4955: Full-Bridge PWM Gate Driver

A4955, A4956, A5957 Full Bridge PWM Driver Gate and Gate Driver Packaging Image


Top Features

Designed for pulse-width-modulated (PWM) control of DC motors, the A4955 is capable of 50 V operation and provides gate drive for an all N-channel external MOSFET bridge.

Input terminals are provided for use in controlling the speed and direction of a DC motor with externally applied PWM control signals. Internal synchronous rectification control circuitry is provided to lower power dissipation during PWM operation.

Internal circuit protection includes VDS protection, thermal shutdown with hysteresis, undervoltage monitoring of VBB, and crossover-current protection.

The A4955 is supplied in a low-profile 4×4 mm, 20-contact QFN package (suffix “ES”) and a 20-lead eTSSOP (suffix “LP”), both with exposed thermal pad.

  • Standard IN1/IN2 control logic
  • Overcurrent indication
  • Adjustable off-time and blank-time
  • Adjustable current limit
  • Adjustable gate drive
  • Synchronous rectification
  • Internal UVLO
  • Crossover-current protection
  • MOSFET VDS protection
  • Voltage output proportional to load current
  • A4955K is AEC-Q100 Grade 1 qualified
  • Commercial temperature grade (A4955G: –40°C to 105°C)
  • Automotive temperature grade (A4955K: –40°C to 125°C)

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
A4955GESTR-T 20-lead QFN -40°C to 105°C Yes View Data Contact your
local sales rep
Distributor Stock
A4955GLPTR-T 20-lead TSSOP -40°C to 105°C Yes View Data Contact your
local sales rep
Distributor Stock
A4955KLPTR-T 20-lead TSSOP -40°C to 125°C Yes View Data Not for new design 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.