The DRV8311 is an integrated MOSFET driver for 3-phase motor-drive applications. The combined high-side and low-side FET's on-state resistance is 210-mΩ typical. The device reduces system component count, cost, and complexity by integrating three half-bridge MOSFETs, gate drivers, charge pump, current sense amplifier and linear regulator for an external load. For the DRV8311S, a standard serial peripheral interface (SPI) provides a simple method for configuring the various device settings and reading fault diagnostic information through an external controller. For the DRV8311H, a hardware interface (H/W) allows for configuring the most commonly used settings through fixed external resistors. For the DRV8311P, Texas Instruments SPI (tSPI) provides the ability to configure various device settings and adjust the PWM duty cycle and frequency to control multiple motors at a time.

The architecture uses an internal state machine to protect against short-circuit events, and protect against dV/dt parasitic turn on of the internal power MOSFETs.

The DRV8311 device integrates three bidirectional low side current-shunt amplifiers for monitoring the current through each of the half-bridges using a built-in current sense and no external current sense resistors are needed. The gain setting of the shunt amplifier can be adjusted through the SPI, tSPI or hardware interface.

In addition to the high level of device integration, the DRV8311 device provides a wide range of integrated protection features. These features include power supply undervoltage lockout (UVLO), charge pump undervoltage lockout (CPUV), overcurrent protection (OCP), AVDD undervoltage lockout (AVDD_UV) and overtemperature shutdown (OTW and OTSD). Fault events are indicated by the nFAULT pin with detailed information available in the registers on the SPI and tSPI device versions.

The DRV8311H, DRV8311P and DRV8311S devices are available in 0.4-mm pin pitch, WQFN surface-mount packages. The WQFN package size is 3.00 mm × 3.00 mm.