MICROSTEPPING DRIVER

WITH TRANSLATOR

ABSOLUTE MAXIMUM RATINGS

Peak................................. ±850 mA

Package Power Dissipation,

Operating Temperature Range,

Storage Temperature Range,

* Output current rating may be limited by

duty cycle, ambient temperature, and heat

sinking. Under any set of conditions, do not

exceed the specified current rating or a

junction temperature of 150°C.

3967

The A3967SLB is a complete microstepping motor driver with

built-in translator. It is designed to operate bipolar stepper motors in

full-, half-, quarter-, and eighth-step modes, with output drive capabil-

ity of 30 V and ±750 mA. The A3967SLB includes a fixed off-time

current regulator that has the ability to operate in slow, fast, or mixed

current-decay modes. This current-decay control scheme results in

reduced audible motor noise, increased step accuracy, and reduced

power dissipation.

The translator is the key to the easy implementation of the

A3967SLB. By simply inputting one pulse on the STEP input the

motor will take one step (full, half, quarter, or eighth depending on two

logic inputs). There are no phase-sequence tables, high-frequency

control lines, or complex interfaces to program. The A3967SLB

interface is an ideal fit for applications where a complex µP is unavail-

able or over-burdened.

Internal circuit protection includes thermal shutdown with hyster-

esis, under-voltage lockout (UVLO) and crossover-current protection.

Special power-up sequencing is not required.

The A3967SLB is supplied in a 24-lead SOIC with copper batwing

tabs. The tabs are at ground potential and need no insulation. A lead-

free (100% matte tin leadframe) version is also available.

FEATURES

s

±750 mA, 30 V Output Rating

s

Satlington™ Sink Drivers

s

Automatic Current-Decay Mode Detection/Selection

s

3.0 V to 5.5 V Logic Supply Voltage Range

s

Mixed, Fast, and Slow Current-Decay Modes

s

Internal UVLO and Thermal Shutdown Circuitry

s

Crossover-Current Protection

LOAD

SLEEP

ENABLE

GND

STEP

RESET

LOAD

DIR

PFD

REF

÷8

LOGIC

SUPPLY

PWM

TIMER

TRANSLATOR

& CONTROL

LOGIC

Dwg. PP-075-2

23

17

8

1

2

3

4

5

6

7

9

12

16

15

14

13

24

22

21

20

19

18

11

10

GND

GND

GND

Always order by complete part number:

Part Number

Package

A3967SLB

24-lead batwing SOIC

A3967SLB-T

24-lead batwing SOIC; Lead-free