Worcester, Mass. - Allegro MicroSystems' A3949 is billed as one of the smallest, most cost-effective high-current DMOS motor drivers available. The full-bridge driver IC delivers up to ±2.8 amps at 36 volts for DC motors in office equipment, medical, and portable applications. It operates from a single supply.
Users control speed and direction using external PWM commands (via PHASE and ENABLE input pins). Braking and braking rate is adjusted via the chip's MODE and PHASE inputs. The low RDS(on) of the chip's DMOS outputs and its internal synchronous rectification control circuitry further reduce power dissipation. Internal circuit protection features include thermal shutdown with hysteresis, under-voltage monitoring, and crossover current protection.
The A3949, available in both a 16-lead thermally enhanced TSSOP package (5 by 4.4 mm) and 16-lead SOIC package with copper batwing tab, is manufactured using Allegro's ABCD3 (Allegro Bipolar CMOS DMOS 3rd generation) process. The A3949 is priced at $1.40 each in 10k quantities.