A4988SETTRT Allegro Micro Systems, Inc., A4988SETTRT Datasheet

A4988SETTRT

Manufacturer Part Number

A4988SETTRT

Description

QFN28

Manufacturer

Allegro Micro Systems, Inc.

Datasheet

1.A4988SETTRT.pdf (20 pages)

Specifications of A4988SETTRT

Date_code

11+

Current page: 1 of 20
Download datasheet (384Kb)

Features and Benefits

▪ Low R

▪ Automatic current decay mode detection/selection

▪ Mixed and Slow current decay modes

▪ Synchronous rectification for low power dissipation

▪ Internal UVLO

▪ Crossover-current protection

▪ 3.3 and 5 V compatible logic supply

▪ Thermal shutdown circuitry

▪ Short-to-ground protection

▪ Shorted load protection

▪ Five selectable step modes: full,

Package:

4988-DS, Rev. 2

DS(ON)

with exposed thermal pad

outputs

5 mm × 5 mm × 0.90 mm

28-contact QFN

Microcontroller or

Controller Logic

(ET package)

Approximate size

DMOS Microstepping Driver with Translator

0.22 μF

Typical Application Diagram

, and

5 kΩ

0.22 μF

VDD

SLEEP

VREF

STEP

MS1

MS2

MS3

DIR

ENABLE

RESET

VREG

The A4988 is a complete microstepping motor driver with

Description

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

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

sixteenth-step modes, with an output drive capacity of up to

35 V and ±2 A. The A4988 includes a fixed off-time current

regulator which has the ability to operate in Slow or Mixed

decay modes.

The translator is the key to the easy implementation of the

A4988. 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 A4988 interface is an ideal fit for applications where a

complex microprocessor is unavailable or is overburdened.

During stepping operation, the chopping control in the A4988

automatically selects the current decay mode, Slow or Mixed.

In Mixed decay mode, the device is set initially to a fast decay

for a proportion of the fixed off-time, then to a slow decay for

the remainder of the off-time. Mixed decay current control

results in reduced audible motor noise, increased step accuracy,

and reduced power dissipation.

Continued on the next page…

ROSC

And Overcurrent Protection

GND

A4988

CP1

0.1 μF

CP2

GND

VCP

SENSE1

SENSE2

OUT1B

OUT2B

0.1 μF

OUT1A

OUT2A

VBB1

VBB2

100 μF

A4988

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