Worcester, Mass.—Allegro MicroSystems' A3950 complements the company's parallel-input family of DC motor drivers. Designed for PWM-based control applications, the 36-volt full-bridge device can deliver peak output currents of ±2.8 amps for the office automation, industrial, and medical markets.
The controller comprises control logic and a charge pump. PWM inputs to the device's phase and enable inputs set motor speed and direction. The chip incorporates synchronous rectification circuitry that will reduce output power dissipation by 10 to 30 percent in most applications, according to the company.
The A3950 includes over-current protection (motor lead short-to-supply or short-to-ground), thermal shutdown with hysteresis, under-voltage lockout of the motor supply and charge pump output, and crossover- current protection. A diagnostic output (open drain) indicates fault conditions.
Click here for the product datasheet. The A3950, in a 5-by-4.4-by-1.2 mm PB-free, 16-lead eTSSOP package, which is reportedly less than one quarter the size of competing devices, is priced at $1.40 each in quantities of 10,000. Lead-time is 14 weeks.
Allegro Microsystems, 1-508-853-5000, www.allegromicro.com