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Product Detailed Parameters
- Description：IC MTR DRVR BIPOLAR 2.5-9V 20QFN
- Series：-
- Mfr：Allegro MicroSystems
- Package：Tape & Reel (TR),Cut Tape (CT)
- Motor Type - Stepper：Bipolar
- Motor Type - AC, DC：Brushed DC
- Function：Driver - Fully Integrated, Control and Power Stage
- Output Configuration：Half Bridge (4)
- Interface：Parallel
- Technology：DMOS
- Step Resolution：1, 1/2
- Applications：Battery Powered
- Current - Output：1A
- Voltage - Supply：2.5V ~ 9V
- Voltage - Load：2.5V ~ 9V
- Operating Temperature：-20°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：20-WFQFN Exposed Pad
- Supplier Device Package：20-QFN-EP (4x4)
- Grade：-
- Qualification：-
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Overview
The A3906SESTR-T is a fully integrated bipolar stepper or dual brushed DC motor driver manufactured by Allegro MicroSystems. It utilizes DMOS technology and operates within a supply voltage range of 2.5V to 9V, delivering an output current of 1A per channel. The device features four half-bridge outputs and supports parallel interfaces with step resolutions of 1 or 1/2. Designed for battery-powered applications, it functions across a junction temperature range of -20°C to 150°C. The component is housed in a surface-mount 20-WFQFN package with an exposed pad (4x4mm) for enhanced thermal performance.
Feature Summary
- Integrates control logic and power stages into a single DMOS solution
- Supports both bipolar stepper motors and dual brushed DC motors
- Includes built-in PWM current control and protection mechanisms
Applications
- Battery-powered office automation equipment
- Industrial automation systems
- Retail point-of-sale terminals
- Medical devices
- CCTV mechanisms
Procurement Notes
Verify the specific suffix 'SESTR-T' corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the 20-QFN-EP footprint matches the target PCB layout, particularly regarding the exposed pad thermal connection requirements. Ensure compatibility with the intended voltage domain between 2.5V and 9V before finalizing procurement specifications.
Selection Notes
Select this component when designing low-voltage motor control circuits requiring integrated drive capabilities without external discrete power transistors. It is suitable for applications needing precise current regulation via external resistors and robust thermal management through the exposed pad design. Consider the 1A continuous output capability against the specific load requirements of the target motor type.
Part Context
This part belongs to the A3906 family of low-voltage motor drivers from Allegro MicroSystems. It is designed to simplify motor control designs by combining all necessary drive and protection functions into a compact package. The device is commonly used in portable and battery-operated devices where space and efficiency are critical constraints.
Replacement Considerations
Check for pin-compatible alternatives within the Allegro A39xx series if different output current ratings or package options are required. Verify functional equivalence regarding interface signals and protection features when considering cross-brand substitutes.
FAQ
What types of motors can the A3906SESTR-T drive?
It is designed to drive bipolar stepper motors or two independent brushed DC motors.
How is the peak current controlled in this driver?
Peak current is controlled via PWM fixed off-time and is determined by the value of an external current sense resistor.
