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Product Detailed Parameters
- Description：IC MOTOR DRIVER 3V-5.5V 24QFN
- Series：-
- Mfr：Allegro MicroSystems
- Package：Tape & Reel (TR),Cut Tape (CT)
- Motor Type - Stepper：-
- Motor Type - AC, DC：Brushed DC
- Function：Controller - Commutation, Direction Management
- Output Configuration：Pre-Driver - Half Bridge (2)
- Interface：Parallel
- Technology：Power MOSFET
- Step Resolution：-
- Applications：General Purpose
- Current - Output：-
- Voltage - Supply：3V ~ 5.5V
- Voltage - Load：4.5V ~ 50V
- Operating Temperature：-20°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：24-WFQFN Exposed Pad
- Supplier Device Package：24-QFN (4x4)
- Grade：-
- Qualification：-
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Overview
The A4957SESTR-T is a brushed DC motor driver IC from Allegro Microsystems, housed in a 24-QFN package. It operates on a supply voltage range of 3V to 5.5V and supports load voltages from 4.5V to 50V. The device features parallel interface control for commutation and direction management. It utilizes power MOSFET technology with two half-bridge pre-drivers. The component functions within an operating temperature range of -20°C to +85°C.
Feature Summary
- Integrated controller providing commutation and direction management capabilities
- Dual half-bridge pre-driver configuration using power MOSFET technology
- Parallel interface support for digital control signals
Applications
- Brushed DC motor control systems
- General purpose motion control applications
- Low voltage automotive or industrial actuators
Procurement Notes
Verify the specific suffix STR-T indicates tape and reel packaging when sourcing. Confirm the 24-QFN footprint matches the target PCB layout. Ensure the input logic voltage aligns with the 3V to 5.5V supply requirement. Check for moisture sensitivity level constraints during storage and handling procedures.
Selection Notes
Select this component for applications requiring integrated commutation logic rather than external microcontroller processing. The parallel interface suits designs where pin count allows direct signal routing. Consider the 50V load voltage capability for higher voltage bus systems despite low logic supply. Evaluate thermal performance requirements given the QFN package size.
Part Context
This part belongs to the A4957 family of stepper and DC motor drivers. It differs from the A4950 series which targets higher voltage brushed DC motors with different current ratings. The A4957 focuses on low-voltage logic integration with high-voltage load handling through its dual half-bridge architecture.
Replacement Considerations
Direct substitutes are not explicitly confirmed in public documentation. Review Allegro's A4950 series for brushed DC applications if higher current is needed. Verify pin compatibility before considering alternative manufacturers' similar half-bridge drivers.
