Brushed DC gate driver reduces board space by 40%

1st July 2015
Nat Bowers

Offering adjustable gate drive settings with the flexibility to drive a wide range of external FETs, Texas Instruments has announced an integrated gate driver which supports multiple motors, speeds or varying loads. The DRV8701 allows designers to replace up to 45 discrete components with a single device to build smaller and more robust designs.

The brushed DC gate driver gives designers the flexibility to choose their external FETs and easily scale the gate-drive current to adjust the FET slew rate, optimise system EMI performance, eliminate the need for external resistors/capacitors and provide additional system protection. The integration of two LDO regulators, a current-sense amplifier and full protection features reduces system board footprint by 40% compared to competitive and discrete solutions.

The DRV8701 offers a wide 5.9 to 45V motor-supply voltage to support industry-standard 12 and 24V supplies. Robust on-chip protection includes under-voltage lockout, overcurrent, shoot-through and thermal shutdown protection, as well as more advanced features such as charge pump under-voltage, gate-drive faults and individual FET VDS monitoring to protect external FETs.

With its adjustable gate drive, advanced protection features and other integrated components, the DRV8701 enables designers to scale their platforms using a single gate driver across various brushed DC motor models in equipment such as white goods, household appliances, robotics, industrial pumps and valves, power tools and home automation.

Engineers can test the gate driver in their system with the DRV8701EVM evaluation module, which also incorporates the MSP430G2553 ultra-low power MCU and CSD18532Q5B NexFET power MOSFET. The EVM supports up to 15A current in a compact form factor that is about the size of a business card. It is available for purchase for $49 via the TI store and authorised distributors.

The DRV8701 is available now in a 4x4mm QFN PowerPAD package, a thermally enhanced standard-size package designed to eliminate the need for bulky heat sinks and slugs. Pricing starts at $0.92 in 1,000 unit quantities.

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