Date: 10/06/2012

Dual DMOS full-bridge motor driver and dual regulators from Allegro with serial port control

Allegro MicroSystems, Inc has announced a new integrated power IC A3998 that is designed to supply the motor driver and power supply requirements for office automation such as printers and scanners as well as industrial applications.

Features of A3998:
1. Incorporates two high current, DMOS full-bridge outputs of 1.5 A at 50 V
2. Two power supply rails are provided for microprocessor or DSP supplies
3. A switching buck regulator steps the supply down to an adjustable low voltage output from 3.3 to 5 V. This voltage can be used to supply external 3.3 V or 5 V rails and also feeds back into the part supplying the adjustable, integrated linear regulator from 1 V to 2.5 V.
4. The serial port provides flexible configuration for the dual full-bridge motor driver
5. Two full-bridges can be programmed to control one stepper motor or two DC motors. Both bridges have integrated fixed off-time PWM current control with programmable decay mode selection.
6. The four bit non-linear DAC can be programmed to produce up to 16 current levels for full, half, 1/4, 1/8 and 1/16 microstep per step resolution in stepper motor configurations.
7. Internal circuit protections such as thermal shutdown with hysteresis, under voltage lockout (UVLO), over current and crossover-current protection.
8. Lead (Pb) free with 100% matte-tin lead frame plating

The A3998SETTR-T is supplied in a low profile, 32-contact QFN, 5 × 5 mm, 0.90 mm nominal height, with exposed thermal pad (suffix ET) package.

For further information: www.allegromicro.com