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Related Links:

Datasheets:
A3958: Full-Bridge PWM Motor Driver (PDF)

Selection Guides:
Power Integrated Circuits,

Power Motor Drivers,

Power Motor Drivers - Full-Bridge

when this product is updated

Technical Publications:
A New Serial-Controlled Motor Driver IC (PDF)

FAQs:
3958: Full-Bridge PWM Motor Driver FAQ

Product Evaluation Kits:
A3958SB Product Evaluation Kit

A3958
DMOS Full-Bridge PWM Motor Driver

Features

• ±2 A, 50 V Continuous Output Rating
• Low rDS(on) Outputs (270 milli-ohms, Typical)
• Programmable Mixed, Fast, and Slow Current-Decay Modes
• Serial Interface Controls Chip Functions
• Synchronous Rectification for Low Power Dissipation
• Internal UVLO and Thermal-Shutdown Circuitry
• Crossover-Current Protection

Description

Designed for pulse-width modulated (PWM) current control of dc motors, the A3958SB and A3958SLB are capable of continuous output currents to ±2 A and operating voltages to 50 V. Internal fixed off-time PWM current-control timing circuitry can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes.

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. The ENABLE input can be programmed via the serial port to PWM the bridge in fast or slow current decay. Internal synchronous rectification control circuitry is provided to reduce power dissipation during PWM operation.

Internal circuit protection includes thermal shutdown with hysteresis, and crossover-current protection. Special power-up sequencing is not required.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A3958SB-T	24-pin DIP	Yes	view data	-20 °C to  85 °C		Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.
A3958SLB-T	24-lead SOIC	Yes	view data	-20 °C to  85 °C		Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.
A3958SLBTR-T	24-lead SOIC	Yes	view data	-20 °C to  85 °C		Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.

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.