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Related Links:

Datasheets:
A3953: 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:
Converting A3952 Applications to Use A3953 Devices (PDF)

A3953
Full-Bridge PWM Motor Driver

Features

• ±1.3 A Continuous Output Current
• 50 V Output Voltage Rating
• 3 V to 5.5 V Logic Supply Voltage
• Internal PWM Current Control
• Saturated Sink Drivers (Below 1 A)
• Fast and Slow Current-Decay Modes
• Automotive Capable
• Sleep (Low Current Consumption) Mode
• Internal Transient-Suppression Diodes
• Internal Thermal-Shutdown Circuitry
• Crossover-Current and UVLO Protection

Description

Designed for bidirectional pulse-width modulated (PWM) current control of inductive loads, the A3953S– is capable of continuous output currents to ±1.3 A and operating voltages to 50 V. Internal fixed off-time PWM current-control circuitry can be used to regulate the maximum load current to a desired value. The peak load current limit is set by the user's selection of an input reference voltage and external sensing resistor. The fixed off-time pulse duration is set by a user-selected external RC timing network. Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover current protection. Special power-up sequencing is not required.

With the ENABLE input held low, the PHASE input controls load current polarity by selecting the appropriate source and sink driver pair. The MODE input determines whether the PWM current-control circuitry operates in a slow current-decay mode (only the selected source driver switching) or in a fast current-decay mode (selected source and sink switching). A user-selectable blanking window prevents false triggering of the PWM current-control circuitry. With the ENABLE input held high, all output drivers are disabled. A sleep mode is provided to reduce power consumption.

When a logic low is applied to the BRAKE input, the braking function is enabled. This overrides ENABLE and PHASE to turn OFF both source drivers and turn ON both sink drivers. The brake function can be used to dynamically brake brush dc motors.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A3953SB-T	16-pin DIP	Yes	view data	-20 °C to  85 °C		Contact Local Sales Representative
A3953SLB-T	16-lead SOIC	Yes	view data	-20 °C to  85 °C		Contact Local Sales Representative
A3953SLBTR-T	16-lead SOIC	Yes	view data	-20 °C to  85 °C		Contact Local Sales Representative

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.