DRV8873 H-Bridge Motor Driver

By Texas Instruments 133

DRV8873 H-Bridge Motor Driver

Texas Instruments' DRV8873 device is an integrated driver IC for driving a brushed DC motor in industrial applications. Two logic inputs control the H-bridge driver consisting of four N-channel MOSFETs that drive motors bidirectionally with up to 10 A peak current. The device operates from a single power supply and supports a wide input supply range from 4.5 V to 38 V.

A PH/EN or PWM interface allows for simple interfacing to controller circuits. Alternatively, independent half-bridge control is available to drive two solenoid loads. A current mirror allows the controller to monitor the load current. The mirror approximates the current through the high-side FETs and does not require a high-power resistor for sensing the current.

A low-power sleep mode is provided to achieve an ultra-low quiescent current draw by shutting down much of the internal circuitry. Internal protection functions are provided for undervoltage lockout, charge pump faults, overcurrent protection, short-circuit protection, open-load detection, and overtemperature. Fault conditions are indicated on an nFAULT pin and through the SPI registers.

Features
  • H-bridge motor driver:
    • Drives one DC motor, one winding of a stepper motor, or solenoid loads
  • Operating voltage range: 4.5 V to 38 V
  • Current mirror for output current sensing
  • Supports 1.8 V, 3.3 V, and 5 V logic inputs
  • Low-power sleep mode: 10 µA
  • Peak current drive: 10 A
  • Low HS + LS RDS(ON):
    • 150 mΩ at TJ = +25°C, 13.5 V
    • 250 mΩ at TJ = +150°C, 13.5 V
  • Small package and footprint:
    • 24 HTSSOP PowerPAD™ IC package
  • SPI or hardware interface options
  • Configurable control interface:
    • PH/EN
    • PWM (IN1/IN2)
    • Independent half-bridge control
  • Protection features:
    • VM under-voltage lockout (UVLO)
    • Charge pump under-voltage (CPUV)
    • Overcurrent protection (OCP)
    • Output short to battery and short to ground protection
    • Open load detection
    • Thermal shutdown (TSD)
    • Fault condition output (nFAULT/SPI)
Applications
  • ePOS and currency counters
  • Factory automation and robotics
  • Multi-function printers
  • Laser beam printers
  • ATMs
  • Motorized window blinds
  • Adjustable desks and beds

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