A3984SLPTR

Overview

The A3984SLPTR is a complete microstepping motor driver with a built-in translator, designed for bipolar stepper motors. It supports full-, half-, quarter-, and sixteenth-step modes. The device features an output drive capacity of up to 35 V and ±2 A. Key electrical parameters include a supply voltage range of 3V to 5.5V and a load voltage range of 8V to 35V. It operates within a temperature range of -20°C to +150°C (TJ). The component utilizes DMOS technology and is housed in a 24-TSSOP-EP package.

Feature Summary

• Integrates a fixed off-time current regulator capable of operating in Slow or Mixed decay modes.
• Includes automatic current decay mode detection and selection for optimized performance.
• Features synchronous rectification to minimize power dissipation.
• Incorporates internal UVLO and thermal shutdown circuitry for protection.

Applications

• Bipolar stepper motor control
• Microstepping applications requiring full, half, quarter, or sixteenth-step resolution

Procurement Notes

Verify the specific suffix against official Allegro MicroSystems documentation to confirm package type and tape/reel specifications. Ensure compatibility with system voltage requirements, as the logic supply differs from the load voltage. Confirm RoHS compliance status for the specific manufacturing batch, as historical data indicates variations between older and newer production runs.

Selection Notes

Select this component when a fully integrated solution with a built-in translator is required to simplify interface design. It is suitable for applications needing high output current capability up to 2A and precise microstepping control. Consider the thermal management requirements due to the TSSOP-EP package and the wide operating temperature range.

Part Context

The A3984 belongs to the Allegro A398x series of DMOS microstepping drivers. It shares functional similarities with parts like the A3983 and A4984 but offers specific current and voltage ratings. The SLPTR suffix denotes the surface-mount TSSOP package variant. This part is distinct from brushed DC motor drivers in the same family.

Replacement Considerations

Official parameter-equivalent substitutes include A3984SLPTR-T and A4982SLPTR-T. Verify pinout and electrical specifications before substitution.