A4987: DMOS Dual Full-Bridge PWM Motor Driver with Overcurrent Protection

The A4987 is a dual DMOS full-bridge stepper motor driver with parallel input communication and overcurrent protection. Each full-bridge output is rated up to 35 V and ±1 A. The A4987 includes fixed off-time pulse width modulation (PWM) current regulators, along with 2- bit nonlinear DACs (digital-to-analog converters) that allow stepper motors to be controlled in full, half, and quarter steps. 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.

The outputs are protected from shorted load and short-toground events, which protect the driver and associated circuitry from thermal damage or flare-ups. Other protection features include thermal shutdown with hysteresis, undervoltage lockout (UVLO) and crossover current protection. Special power-up sequencing is not required.

The A4987 is supplied in two packages, a 24-contact QFN (ES) and a 24-pin TSSOP (LP). Both packages have exposed thermal pads for enhanced thermal performance. The 24-contact ES is 4 mm × 4 mm, with a nominal overall package height of 0.75 mm. The 24-pin LP is a TSSOP with 0.65 pitch and an overall package height of ≤1.2 mm. Both packages are lead (Pb) free, with 100% matte tin leadframe plating.

DATASHEETS
SAMPLE & BUY

Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

If this is not your local representative, find your local sales rep here.

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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • Low RDS(ON) outputs
  • Internal mixed current decay mode
  • Synchronous rectification for low power dissipation
  • Internal UVLO
  • Crossover-current protection
  • 3.3 and 5 V compatible logic supply
  • Thin profile QFN and TSSOP packages
  • Thermal shutdown circuitry
  • Short-to-ground protection
  • Shorted load protection
  • Low current Sleep mode, <10 µA

The A4987 is supplied in two packages, a 24-contact QFN (ES) and a 24-pin TSSOP (LP). Both packages have exposed thermal pads for enhanced thermal performance. The 24-contact ES is 4 mm × 4 mm, with a nominal overall package height of 0.75 mm. The 24-pin LP is a TSSOP with 0.65 pitch and an overall package height of ≤1.2 mm. Both packages are lead (Pb) free, with 100% matte tin leadframe plating.

ES-QFN and LP-TSSOP combined

 

Click the image to view larger
Functional Block Diagram Typical Application

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A4987SESTR-T 24-lead QFN -20°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A4987SLPTR-T 24-lead TSSOP -20°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
APEK4987SES-01-T DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Check Stock
APEK4987SLP-01-T DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Check Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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