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Related Links:

Datasheets:
A2919: Dual 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:
A2919 Current Ration / Timing Diagrams (PDF)

Press Releases:
Dual Full-Bridge Motor Driver IC

A2919
Dual Full-Bridge PWM Motor Driver

Features

• 750 mA Continuous Output Current
• 45 V Output Sustaining Voltage
• Internal Clamp Diodes
• Internal PWM Current Control
• Low Output Saturation Voltage
• Internal Thermal Shutdown Circuitry
• Half- or Quarter-Step Operation of Bipolar Stepper Motors

Description

The A2919SB and A2919SLB motor drivers are designed to drive both windings of a bipolar stepper motor or bidirectionally control two dc motors. Both bridges are capable of sustaining 45 V and include internal pulse-width modulation (PWM) control of the output current to 750 mA. The outputs have been optimized for a low output-saturation voltage drop (less than 1.8 V total source plus sink at 500 mA).

For PWM current control, the maximum output current is determined by the user's selection of a reference voltage and sensing resistor. Two logic-level inputs select output current limits of 0%, 41%, 67%, or 100% of the maximum level. A PHASE input to each bridge determines load current direction.

The bridges include both ground clamp and flyback diodes for protection against inductive transients. Internally generated delays prevent cross-over currents when switching current direction. Special power-up sequencing is not required. Thermal protection circuitry disables the outputs if the chip temperature exceeds safe operating limits.

PWM Current-Control Circuitry

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A2919SB	24-pin DIP	No	view data	-20 °C to  85 °C	discontinued	samples not available
A2919SLB	24-lead SOIC	No	view data	-20 °C to  85 °C	discontinued	samples not available
A2919SLB-T	24-lead SOIC	Yes	view data	-20 °C to  85 °C		Contact Local Sales Representative
A2919SLBTR	24-lead SOIC	No	view data	-20 °C to  85 °C	discontinued	samples not available
A2919SLBTR-T	24-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.