A3980KLP datasheet(2/18 Pages) ALLEGRO

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Description

The A3980 is a complete microstepping motor driver with

built-in translator for easy operation. It is designed to operate

bipolar stepper motors in full-, half-, eighth-, and sixteenth-

step modes, at up to 35 V and ±1 A. The A3980 includes a

fixed off-time current regulator which has the ability to operate

in slow, fast, or mixed decay modes. This results in reduced

audible motor noise, increased step accuracy, and reduced

power dissipation.

The translator is the key to the easy implementation of the

A3980. Simply inputting one pulse on the step input drives

the motor one microstep. There are no phase sequence tables,

high frequency control lines, or complex interfaces to program.

The A3980 interface is an ideal fit for applications where a

complex μP is unavailable or overburdened.

Internal synchronous rectification control circuitry is provided

to improve power dissipation during PWM operation.

Internal circuit protection includes: thermal shutdown with

hysteresis, overvoltage lockout (OVLO), undervoltage lockout

(UVLO), and crossover current protection. Special power-up

sequencingisnotrequired.Inaddition,twodiagnosticfaultflags

provide indication of shorts or opens on the motor windings.

The A3980 is supplied in a low-profile (1.1 mm) 28L TSSOP

with exposed thermal pad. This device is lead (Pb) free, with

100% matte tin leadframe plating.

26184.26H

Features and Benefits

▪ Typical application up to ±1 A, 35 V output rating

▪ Low RDS(ON) outputs, 0.67 Ω source, 0.54 Ω sink typical

▪ Automatic current decay mode detection/selection

▪ 3.0 V to 5.5 V logic supply voltage range

▪ Mixed, fast, and slow current decay modes

▪ Synchronous rectification for low power dissipation

▪ Internal OVLO, UVLO, and thermal shutdown circuitry

▪ Crossover current protection

▪ Short to supply/ground and short/low load current

diagnostics

Automotive DMOS Microstepping Driver with Translator

Package: 28 pin TSSOP with exposed

thermal pad (suffix LP)

Typical Application

Approximate Size

A3980

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