A3992SLPTRT Allegro Micro Systems, Inc., A3992SLPTRT Datasheet

A3992SLPTRT

Manufacturer Part Number

A3992SLPTRT

Description

SSOP24

Manufacturer

Allegro Micro Systems, Inc.

Datasheet

1.A3992SBT.pdf (13 pages)

Specifications of A3992SLPTRT

Date_code

06+

Current page: 1 of 13
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Features and Benefits

▪ ±1.5 A, 50 V continuous output rating

▪ Low R

▪ Short-to-ground protection

▪ Shorted load protection

▪ Optimized microstepping via six bit linear DACs

▪ Programmable mixed, fast, and slow current decay modes

▪ 4 MHz internal oscillator for digital timing

▪ Serial interface controls chip functions

▪ Synchronous rectification for low power dissipation

▪ Internal UVLO and thermal shutdown circuitry

▪ Crossover-current protection

▪ Inputs compatible with 5 or 3.3 V control signals

▪ Sleep and Idle modes

Packages

3992DS

24 pin batwing DIP (sufﬁ x B) and 24 pin TSSOP with

exposed thermal pad (sufﬁ x LP)

DMOS Dual Full-Bridge Microstepping PWM Motor Driver

LP package approximate scale

DS(on)

DMOS output drivers

Microcontroller or

Controller Logic

10 μF

5 kΩ

Typical Application

VDD

ROSC

CLOCK

DATA

STROBE

REF

SLEEP

VREG

0.22 μF

Description

Designed for pulse width modulated (PWM) current control of

bipolar microstepped stepper motors, the A3992 is capable of

continuous output currents to ±1.5 A and operating voltages to

50 V. Internal fixed off-time PWM current control timing circuitry

can be programmed via the serial interface to operate in slow, fast,

or mixed decay modes.

The desired load current level is set via the serial port with two

six bit linear DACs in conjunction with a reference voltage. The

six bits of control allow maximum flexibility in torque control for

a variety of step methods, from microstepping to full step drive.

Load current is set in 1.56% increments of the maximum value.

Synchronous rectification circuitry allows the load current to flow

through the low R

decay. This feature eliminates the need for external clamp diodes

in most applications, saving cost and external component count,

while minimizing power dissipation.

Internal circuit protection includes short-to-ground, shorted load,

thermal shutdown with hysteresis, and crossover current protection.

Special power up sequencing is not required.

The A3992 is supplied in a thin profile (1.2 mm maximum height)

24 pin TSSOP (suffix LP) with exposed thermal pad and a 24 pin

plastic DIP with dual copper batwing tabs (suffix B). The exposed

thermal pad on the LP is at ground potential and needs no electrical

isolation. Both packages are lead (Pb) free with 100% matte tin

leadframe plating.

A3992

CP1

0.22 μF

SENSE1

SENSE2

OUT1B

OUT2B

OUT1A

OUT2A

CP2

VBB1

VBB2

VCP

DS(on)

of the DMOS output driver during current

0.22 μF

0.1 μF

100 μF

0.1 μF

A3992

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