A4979GLPTR-T

Overview

The A4979GLPTR-T is a fully integrated bipolar stepper motor driver manufactured by Allegro MicroSystems. It operates with a supply voltage range of 3V to 5.5V and supports load voltages from 7V to 50V. The device delivers an output current of 1.5A using DMOS technology. It features a 28-TSSOP-EP package with exposed pad for surface mount installation. The component supports SPI, step/direction, and analog velocity interfaces. It offers microstepping resolutions of 1, 1/2, 1/4, and 1/16 steps. The operating junction temperature range extends from -40°C to +150°C.

Feature Summary

• Fully integrated control and power stage for bipolar stepper motors
• Supports multiple interface modes including SPI, Step/Direction, and Analog Velocity
• Provides selectable microstepping resolutions for smooth motion control
• Includes thermal shutdown and overcurrent protection mechanisms

Applications

• General purpose automation systems
• Office equipment such as printers and scanners
• Security systems requiring precise positioning
• Medical devices needing controlled motor movement

Procurement Notes

Verify the specific suffix GLPTR-T against official datasheets to confirm package type and tape/reel specifications. Ensure compatibility with system voltage requirements, specifically the 3V to 5.5V logic supply and 7V to 50V motor load range. Confirm humidity sensitivity level and storage conditions prior to assembly. Cross-reference pinout configurations with PCB layout designs to prevent integration errors during manufacturing.

Selection Notes

Select this component when a single-chip solution for bipolar stepper motors is required. It is suitable for applications demanding high efficiency and low heat dissipation due to its DMOS technology. Consider the 28-TSSOP-EP package for space-constrained designs. Evaluate the need for SPI programmability versus simpler Step/Direction control based on system complexity. Ensure the 1.5A output current meets the motor coil requirements without excessive derating.

Part Context

This part belongs to the A4979 series of stepper motor drivers from Allegro MicroSystems. The series is designed for high-efficiency operation in various industrial and consumer applications. The TSSOP-28 package provides a compact footprint suitable for modern electronics. The device integrates advanced protection features to enhance reliability in dynamic motor control environments.

Replacement Considerations

Check for direct substitutes within the A4979 family or similar Allegro stepper drivers. Verify pin-to-pin compatibility if replacing existing components. Ensure that alternative parts support the same voltage ranges and current capabilities. Review datasheet differences regarding interface protocols and thermal performance before substitution.

FAQ

What microstepping resolutions are supported?

The A4979GLPTR-T supports full step (1), half step (1/2), quarter step (1/4), and sixteenth step (1/16) resolutions.

What is the maximum load voltage?

The device supports a load voltage range up to 50V.

Does it include protection features?

Yes, it includes thermal shutdown and overcurrent protection to safeguard the motor and driver.