Allegro expands full-bridge DMOS PWM motor driver series

Allegro MicroSystems Inc. has released a pair of two full-bridge motor driver ICs that are designed for use in brush DC motor drive applications.

Allegro's A4952 and A4953 are rated for peak output currents to ±2 A, and operating voltages to 40 V. Input terminals are provided for use in controlling the speed and direction of a DC motor with externally applied PWM control signals. Both devices feature internal fixed off-time PWM where the maximum current can be adjusted by the user's selection of an optional sense resistor and the voltage applied to a VREF pin.

Internal synchronous rectification control circuitry is provided to lower power dissipation during PWM operation. Internal circuit protection includes overcurrent protection (OCP), motor lead short to ground or supply, thermal shutdown with hysteresis, under voltage monitoring of VBB, and crossover current protection. The A4952 includes a FAULT pin and the ability to change the behavior of the OCP latch based on the logic level applied to the RTRY pin. These devices are primarily targeted at the office automation market; however, they are also suitable for commercial and industrial applications requiring a brush DC motor driver IC.

The A4952ELYTR-T is available in a 10-pin MSOP package and the A4953ELJTR-T is available in an 8-pin SOICN package. Both packages feature an exposed pad for enhanced thermal dissipation and are lead (PB) free with 100% matte tin plated lead frames. 

Key highlights:

• Rated for peak output currents to ±2 A
• Operating voltages to 40 V
• Overcurrent protection (OCP)
  • Motor short protection
  • Motor lead short to ground protection
  • Motor lead short to battery protection
• Low Power Standby mode
• Adjustable PWM current limit
• Synchronous rectification
• Internal undervoltage lockout (UVLO)
• Crossover-current protection
• Fault output (A4952 only)
• Selectable retry (A4952 only)

Pricing:  In 1K quantities, the A4952ELYTR-T is priced at $0.91 and the A4953ELJTR-T at $0.81.

Availability: Now.

Datasheet: Click here.