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Related Links:

Datasheets:
A3949: DMOS Full-Bridge Motor Driver (PDF)

Selection Guides:
Power Integrated Circuits,

Power Motor Drivers - Full-Bridge

when this product is updated

Press Releases:
A3949: Allegro MicroSystems, Inc. Announces a Low-Cost 2.8 A DMOS Motor Driver in Small Footprint Package

A3949
DMOS Full-Bridge Motor Driver

Features

• Single supply operation
• Very small outline package
• Low RDS(ON) outputs
• Sleep function
• Internal UVLO
• Crossover current protection
• Thermal shutdown protection

Description

Designed for PWM (pulse width modulated) control of dc motors, the A3949 is capable of peak output currents to ±2.8 A and operating voltages to 36 V.

PHASE and ENABLE input terminals are provided for use in controlling the speed and direction of a dc motor with externally applied PWM control signals. Internal synchronous rectification control circuitry is provided to reduce power dissipation during PWM operation.

Internal circuit protection includes thermal shutdown with hysteresis, undervoltage monitoring of VBB and VCP, and crossover current protection.

The A3949 is supplied in a choice of two power packages, a 16-pin plastic SOIC with a copper batwing tab (part number suffix LB), and a low profile (1.1mm) 16-pin TSSOP (suffix LP) with exposed power tab. Both packages are lead (Pb) free, with 100% matte tin leadframes.

Also see: A3950 DMOS Full-Bridge Motor Driver.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A3949SLB-T	16-lead SOIC	Yes	view data	-20 °C to  85 °C
A3949SLBTR-T	16-lead SOIC	Yes	view data	-20 °C to  85 °C		samples not available
A3949SLP-T	16-lead TSSOP	Yes	view data	-20 °C to  85 °C
A3949SLPTR-T	16-lead TSSOP	Yes	view data	-20 °C to  85 °C		samples not available

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.