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Related Links:

Datasheets:
A3906: Low Voltage Stepper and Single/Dual DC Motor Driver (PDF)

Selection Guides:
Power Integrated Circuits,

Power Motor Drivers

when this product is updated

Press Releases:
A3906: Allegro MicroSystems, Inc. Introduces New Low Voltage Dual DC/Stepper Motor Driver

A3906
Low Voltage Stepper and Single/Dual DC Motor Driver

Features

• 2.5 to 9 V operation
• Internal PWM current limit control
• Synchronous rectification for reduced power dissipation
• Peak current output flag
• Undervoltage lockout
• Low R_DS(on) outputs
• Small package
• Brake mode for DC motors
• Sleep function
• Crossover-current protection
• Thermal shutdown

Applications

• Digital still cameras (DSC)
• Cell phone cameras
• USB powered devices
• Battery powered devices

Description

Designed for pulse width modulated (PWM) control of low voltage stepper motors, and single and dual DC motors, the A3906 is capable of output currents up to 1 A per channel and operating voltages from 2.5 to 9 V.

The A3906 has an internal fixed off-time PWM timer that sets a peak current based on the selection of a current sense resistor. An overcurrent output flag is provided that notifies the user when the current in the motor winding reaches the peak current determined by the sense resistor. The fault output does not affect driver operation.

The A3906 is provided in a 20-contact, 4 mm × 4 mm, 0.75 mm nominal overall height QFN, with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A3906SES-T	20-lead QFN	Yes	view data	-20 °C to  85 °C	new
A3906SESTR-T	20-lead QFN	Yes	view data	-20 °C to  85 °C	new	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.