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Texas Instruments DRV8334 Integrated Smart Gate Driver

Texas Instruments DRV8334 Integrated Smart Gate Driver is designed for three-phase BLDC applications. The device provides three half-bridge gate drivers, each capable of driving high-side and low-side N-channel power MOSFETs. The DRV8334 generates the correct gate drive voltages using an integrated bootstrap diode and a GVDD charge pump. The Smart Gate Drive architecture supports configurable peak gate drive current from 0.7mA up to 1A source and 2A sink. The DRV8334 can operate from a single power supply with a wide input range of 4.5V to 60V. A trickle charge pump allows the gate drivers to support 100% PWM duty cycle control and provides overdrive gate drive voltage for external switches.

The Texas Instruments DRV8334 provides low-side current sense amplifiers to support resistor-based low-side current sensing. The low offset of the amplifiers enables the system to obtain precise motor current measurements. A wide range of diagnostics and protection features integrated into the DRV8334 enable a robust motor drive system design and help eliminate the need for external components. The highly configurable device response allows the device to integrate seamlessly into various system designs.

Features

Three-phase half-bridge gate driver
- Drives six N-channel MOSFETs (NMOS)
- 4.5V to 60V wide operating voltage range
- Bootstrap architecture for high-side gate driver
- Strong GVDD charge pump to support up to 50mA average gate switching current enables driving 400nC MOSFETs at 20kHz
- Trickle charge pump to support 100% PWM duty cycle and to generate overdrive supply to drive external cut-off or reverse polarity protection circuit
Smart Gate Drive architecture
- 45-level configurable peak gate drive current up to 1000mA/2000mA (source/sink)
- Three-step drive current configuration to optimize charge/discharge cycle and minimize deadtime
- Closed-loop automatic deadtime insertion based on gate-source voltage monitoring
- Configurable soft shutdown to minimize inductive voltage spikes during overcurrent shutdown
Low-side current sense amplifier
- Sub-1mV low input offset across temperature
- 9-level adjustable gain

SPI-based detailed configuration and diagnostics
DRVOFF pin to disable driver independently
High voltage wake-up pin (nSLEEP)
6x, 3x, 1x, and independent PWM modes
Supports 3.3V and 5V logic inputs
Integrated protection features
- Battery and power supply voltage monitors
- Phase feedback comparator
- MOSFET V_DS and R_sense over current monitors
- MOSFET V_GS gate fault monitors
- Device thermal warning and shutdown
- Fault condition indicator pin

Applications

Appliances, cordless garden and power tools, and lawnmowers
Brushless-DC (BLDC) motor modules and PMSM
Fans, pumps, and servo drives

E-Bikes, E-Scooters, and E-Mobility
Cordless vacuum cleaners
Drones, industrial and logistics robots, and RC toys

Texas Instruments DRV8334 Integrated Smart Gate Driver

Features

Applications

Simplified Schematic

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