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A4990

Allegro MicroSystems
Part Number A4990
Manufacturer Allegro MicroSystems
Description Automotive Dual Full-Bridge Driver
Published Nov 5, 2016
Detailed Description A4990 Automotive Dual Full-Bridge Driver FEATURES AND BENEFITS • Two full-bridge power outputs • Typical application up...
Datasheet PDF File A4990 PDF File

A4990
A4990

Overview
A4990 Automotive Dual Full-Bridge Driver FEATURES AND BENEFITS • Two full-bridge power outputs • Typical application up to ±800 mA, 28 V • Adjustable peak current limit control • Minimum overcurrent shutdown at 1.
4 A • Continuous operation at high ambient temperature • Synchronous rectification for low power dissipation • Simple parallel interface control • Inverted and non-inverted inputs • No crossover current • Low current consumption in sleep mode • Error flag diagnostics • Open load diagnostic during on-state for all outputs • Outputs protected against overcurrent • Overtemperature protection with hysteresis Continued on the next page… PACKAGE: 20-pin TSSOP with exposed thermal pad (suffix LP) Not to scale DESCRIPTION The A4990 is a dual full-bridge driver for stepper motors and small brush DC motors in automotive applications.
Each full bridge uses DMOS power devices with integrated freewheeling diodes.
Control circuits prevent cross-conduction, or shootthrough, when switching between high-side and low-side drives.
This device drives stepper motors with full current in either direction in each phase, allowing two-phase on, full-step operation.
It drives DC motors in both directions and has brake capability.
A single input turns-off both bridges, allowing motors to coast.
All control modes can easily be achieved using 3, 4, or 5 outputs from a standard parallel interface of a microcontroller.
The peak motor current can be limited by sense resistor selection, providing higher efficiency, reduced motor heating, and longer motor life.
The outputs are protected from short circuits to supply and to ground, and low load-current detection is included.
Chip level protection includes: overtemperature shutdown, and overvoltage and undervoltage lockout.
The A4990 is supplied in a 20-lead TSSOP power package with an exposed thermal pad (package type LP).
This package is lead (Pb) free with 100% matte-tin lead frame plating.
Microcontroller or ECU CP1 CP2 VCP VBB OUT1 ...


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