Fully Integrated DC Motor Driver Shrinks Board Space In Vehicles, Printers & More


Allegro has unveiled a new fully-integrated motor driver chip designed for pulse-width-modulated (PWM) control of DC motors. Capable of peak output currents up to ±3 A and operating voltages up to 40 V, the new A5950 is targeted at automotive applications including heads-up-display, shift drive, door closure and engine thermal management applications. It is also ideal for driving brush DC motors for ATM cash dispensers, robotic vacuums, printers, copiers and ticketing and vending applications.

The new DC motor driver chip is fully integrated to reduce design complexity and PCB area compared to discrete solutions, claims the firm.

Input terminals are provided for use in controlling the speed, direction and torque of a DC motor with externally applied PWM control signals.

Internal synchronous rectification control circuitry is provided to lower power dissipation during PWM operation and low current standby mode is included to improve efficiency.

Internal circuit protection includes overcurrent protection, motor lead short to ground or supply, thermal shutdown with hysteresis, undervoltage monitoring of VBB, and crossover-current protection.

Diagnostic features include an analog output that can be used to monitor the current through the external sense resistor and an open drain FAULTn output.

The A5950 is supplied in a low-profile 4 mm × 4 mm, 16-contact QFN (suffix “EU”) package with wettable flank option (suffix “-J”), or a 16-lead eTSSOP (suffix “LP”), both with exposed power tab for enhanced thermal performance.

Click here to view the full Press release.

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