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A4955 Full-Bridge PWM Gate Driver

Allegro MicroSystems

A4955 : Full-Bridge PWM Gate Driver

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.

Product Number: A4955

Class: Fan, Motor Controllers, Drivers, Brush DC Drivers, PWM Gate Driver

Tag: Brush DC Drivers, Full-Bridge PWM Gate Driver, Motor, Motion

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 Type Operating Supply Current Technology Mounting Style Output Current Interface Applications Output Voltage Operating Temperature Operating Supply Voltage Package Type
A4955 Full-Bridge 6 mA NMOS Surface Mount 68 mA Parallel General Purpose 6.8 V -40 °C ~ 105 °C(TA) 5.5V ~ 50V 20-Pin QFN (suffix “ES”) with Exposed Thermal Pad
20-Pin eTSSOP (suffix “LP”)with Exposed Thermal Pad

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    Datasheet Download on Jul, 2022

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