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A3989 Datasheet(PDF) 1 Page - Allegro MicroSystems

Part No. A3989
Description  Bipolar Stepper and High Current DC Motor Driver
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A3989 Datasheet(HTML) 1 Page - Allegro MicroSystems

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Description
The A3989 is designed operate at voltages up to 36 V while driving
one bipolar stepper motor, at currents up to 1.2A, and one dc motor,
at currents up to 2.4 A. The A3989 includes a fixed off-time pulse
width modulation (PWM) regulator for current control. The stepper
motor driver features dual 2-bit nonlinear DACs (digital-to-analog
converters) that enable control in full, half, and quarter steps. The
dc motor is controlled using standard PHASE and ENABLE signals.
Fast or slow current decay is selected via the MODE pin. The PWM
current regulator uses the Allegro® patented mixed decay mode for
reduced audible motor noise, increased step accuracy, and reduced
power dissipation.
Internal synchronous rectification control circuitry is provided to
improve power dissipation during PWM operation.
Protection features include thermal shutdown with hysteresis,
undervoltage lockout (UVLO) and crossover current protection.
Special power up sequencing is not required.
The A3989 is supplied in a leadless 6 mm × 6 mm × 0.9 mm,
36 pin QFN package with exposed power tab for enhanced thermal
performance. The package is lead (Pb) free, with 100% matte tin
leadframe plating.
A3989DS
Features and Benefits
▪ 36Voutputrating
▪ 2.4Adcmotordriver
▪ 1.2Abipolarstepperdriver
▪ Synchronousrectification
▪ Internalundervoltagelockout(UVLO)
▪ Thermalshutdowncircuitry
▪ Crossover-currentprotection
▪ VerythinprofileQFNpackage
Bipolar Stepper and High Current DC Motor Driver
Package: 36 pin QFN with exposed thermal pad
0.90 mm nominal height (suffix EV)
A3989
Approximate scale 1:1
Microcontroller or
Controller Logic
PHASE1
I01
I11
PHASE2
I02
I12
PHASE3
ENABLE
MODE
VREF1
VREF2
VREF3
VDD
CP1
CP2 VCP VBB VBB
OUT1A
OUT1B
SENSE1
SENSE2
GND
GND
OUT2A
OUT2B
A3989
0.1 µF
50 V
100 µF
50 V
0.22 µF
50 V
0.1 µF
50 V
OUT3A
OUT3A
OUT3B
OUT3B
SENSE3
SENSE3
Figure 1. Typical application circuit


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