Dual Half-Bridge Motor Driver IC For Unidirectional Drive Of Two DC Motors
The new A3910 from Allegro MicroSystems is a dual half-bridge motor driver IC designed for the unidirectional drive of two DC motors in low-cost, low- voltage battery-operated applications. The A3910 offers features such as thermal shutdown and “sleep” functionality in a small package that is competitive in size and price with equivalent discrete-component solutions.
The new A3910 device is targeted at the consumer market for applications such as game controllers and home entertainment systems featuring haptic feedback.
The outputs of the A3910 are rated for operation at up to 500 mA. Direct control of high-side and low-side drivers is implemented to allow either high-side or low-side pulse-width modulation. The motor can be connected to either supply or ground.
The use of an MOS switch results in improved braking action for the motor, compared to implementation with a simple clamp diode. The A3910 can also be used to drive a single bidirectional DC motor.
The Allegro A3910EEETR-T is supplied in a 2 mm × 2 mm 8-lead DFN package with exposed thermal pad (suffix EE). It is lead (Pb) free, with 100% matt tin leadframe plating.
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