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Datasheets:
A3949: DMOS Full-Bridge Motor Driver (PDF)
Selection Guides:
Power Integrated Circuits,
Power Motor Drivers - Full-Bridge
Press Releases:
A3949: Allegro MicroSystems, Inc. Announces a Low-Cost 2.8 A DMOS Motor Driver in Small Footprint Package
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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.
A3949SLPTR-T variant is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: May 4, 2009. Recommended alternative: A3950.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A3949SLBTR-T | 16-lead SOIC | Yes | view data | -20 °C to 85 °C |
Contact Local Sales Representative or check distributor stock |
||
| A3949SLPTR-T | 16-lead TSSOP | Yes | view data | -20 °C to 85 °C | last-time buy |
Contact Local Sales Representative or check distributor stock |
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.