Automotive H-bridge smart gate driver EVM with low-side current sense amplifier


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The DRV8705S-Q1EVM is designed to evaluate the DRV8705H-Q1, which is an integrated, automotive qualified brushed DC motor driver. The DRV8705S-Q1 is a highly integrated H-bridge gate driver, capable of driving high-side and low-side N-channel power MOSFETs. It generates the proper gate drive voltages using an integrated doubler charge pump for the high-side and a linear regulator for the low-side.

The device uses a smart gate drive architecture to reduce system cost and improve reliability. The gate driver optimizes dead time to avoid shoot-through conditions, provides control to decreasing electromagnetic interference (EMI) through adjustable gate drive current, and protects against drain to source and gate short conditions with VDS and VGS monitors.

A shunt amplifier provides low side current sensing to continuously measure motor current.

The DRV8705S-Q1 provide an array of protection features to ensure robust system operation. These include under and over voltage monitors for the power supply and charge pump, VDS overcurrent and VGS gate fault monitors for the external MOSFET, and internal thermal warning and shutdown protection.

The DRV8705S-Q1EVM has an H-bridge consisting of four N-channel MOSFETs that drive motors bi-directionally at up to 15-A RMS, 20-A peak current. The EVM operates from a single power supply for the analog power and from the USB line for the digital power, which can be customized to be externally supplied. A negative 18 V reverse baterry protection circuit, along with a 20 A RMS rated PI filter are provided to clean up the power supply input and protect against incorrect battery connections.

  • H-bridge smart gate driver EVM for automotive applications
    • Temperature grade 1: –40°C to +125°C, TA
    • 4.9-V to 37-V operating range
    • Doubler charge pump for 100% PWM
    • Half-bridge and H-bridge control modes
    • SPI interface for simple configuration
  • Smart gate drive architecture
    • Adjustable slew rate control
    • 1.0-mA to 62-mA peak source current output
    • 1.0-mA to 62-mA peak sink current output
    • Integrated dead-time handshaking
    • MOSFET drain to source and gate monitors
  • Current shunt amplifier
    • Low side sensing
    • Adjustable gain settings (10, 20, 40, 80 V/V)
    • Integrated feedback resistors
  • Integrated protection features
    • Dedicated driver disable pin (DRVOFF)
    • Supply and regulator undervoltage monitors
    • MOSFET VDS overcurrent monitors
    • MOSFET VGS gate fault monitors
    • Charge pump for reverse polarity MOSFET
    • Device thermal warning and shutdown
    • Fault condition interrupt pin (n fault)
Brushed DC (BDC) motor drivers
DRV8705-Q1 Automotive, 40-V, H-bridge Smart Gate Driver w/offline diagnostics


MSP430 microcontrollers
MSP430F2617 16 MHz MCU with 92KB Flash, 8KB SRAM, 12-bit ADC, Dual 12-bit DAC, I2C/SPI/UART, HW multiplier, DMA


N-channel MOSFETs
CSD18512Q5B 40-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 1.6 mOhm

Get started

  1. Order the DRV8705S-Q1EVM evaluation module
  2. Download the DRV8705S-Q1EVM software
  3. Read the user guide

Order & start development

Evaluation board

DRV8705S-Q1EVM — DRV8705S-Q1 evaluation module

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Support software

DRV87XX_DRV8106-Q1EVM Software (Rev. B) — SLVC809B.ZIP (33755KB)

GUI for evaluation module (EVM)

DRV8X06-DRV8705-Q1-GUI-CLOUD — DRV8705-Q1 and DRV8x06 EVM GUI on TI Resource Explorer Cloud

GUI for evaluation module (EVM)

DRV8X06_DRV8705-Q1EVM-WEB-GUI — Web-based GUI for DRV8x06-Q1 and DRV8705-Q1 EVMs

TI's Standard Terms and Conditions for Evaluation Items apply.

Technical documentation

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Type Title Date
* EVM User's guide DRV87xx-Q1EVM and DRV8106-Q1EVM User’s Guide (Rev. A) 12 Mar 2021
User guide DRV87xx-Q1EVM & DRV8106-Q1EVM GUI User's Guide (Rev. A) PDF | HTML 30 Oct 2019
Certificate DRV8705S-Q1EVM EU Declaration of Conformity (DoC) (Rev. A) 30 Jul 2019

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