A4990 Datasheet, PDF (1/13 Pages) Allegro MicroSystems – Automotive Dual Full Bridge Driver

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
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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 shoot-
through, 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
OUT2
IN1
IN2
INH
A4990
IN3
IN4
OUT3
EF1
EF2
VREG
OUT4
SENS12
SENS34
GND
Typical Applications
Automotive
12 V Power Net
Stepper
Motor
Microcontroller
or
ECU
CP1 CP2 VCP VBB
OUT1
IN1
OUT2
IN2
INH A4990
IN3
IN4
OUT3
EF1
EF2
VREG
OUT4
SENS12
SENS34
GND
Automotive
12 V Power Net
DC
Motor
DC
Motor
A4990-DS