DRV8704 Dual-Brushed DC Gate Driver

By Texas Instruments 38

DRV8704 Dual-Brushed DC Gate Driver

Texas Instruments' DRV8704 is a dual-brushed motor controller for industrial equipment applications. The device controls external N-channel MOSFETs configured as two H-bridges. Motor current can be accurately controlled using adaptive blanking time and various current decay modes; including an automatic mixed decay mode.

A simple PWM interface allows easy interfacing to controller circuits. An SPI serial interface is used to program the device operation. Output current (torque), gate drive settings, and decay mode are all programmable through an SPI serial interface.

Internal shutdown functions are provided for over-current protection, short-circuit protection, gate driver faults, under-voltage lockout (UVLO), and over-temperature protection. Fault conditions are indicated by an nFAULT pin, and each fault condition is reported by a dedicated bit through SPI.

The DRV8704 is packaged in a PowerPAD, 38-pin, HTSSOP package with thermal pad (Eco-friendly: RoHS and no Sb/Br).

Features
  • Pulse width modulation (PWM) motor driver
    • Drives external N-channel MOSFETs
    • PWM control interface for dual DC motors
    • Supports 100% PWM duty cycle
  • 8 V to 52 V operating supply voltage range
  • Adjustable gate drive (4 levels)
    • 50 mA to 200 mA source current
    • 100 mA to 400 mA sink current
  • Integrated PWM current regulation
  • Flexible decay modes
    • Automatic mixed decay mode
    • Slow decay
    • Fast decay
    • Mixed decay (adjustable percent fast)
  • Highly configurable SPI
  • Torque DAC to digitally scale current
  • Low-current sleep mode (65 µA)
  • 5 V, 10 mA LDO regulator
  • Thermally enhanced, surface-mount package
    • 38-pin HTSSOP (PowerPAD)
  • Protection features
    • VM under-voltage lockout (UVLO)
    • Gate driver fault (PDF)
    • Over-current protection (OCP)
    • Thermal shutdown (TSD)
    • Fault condition indication pin (nFAULT)
    • Fault diagnostics through SPI

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