The MCT8316A provides a single-chip, code-free sensorless trapezoidal solution for customers requiring high speed operation (up to 3 kHz electrical speed) or very fast startup time (< 50ms) for 12- to 24-V brushless-DC motors requiring up to 8-A peak phase currents.

The MCT8316A integrates three 1/2-H bridges with 40-V absolute maximum capability and a very low R_DS(ON) of 95-mΩ (high-side + low-side) to enable high power drive capability. Current is sensed using an integrated current sensing circuit which eliminates the need for external sense resistors. Power management features of an adjustable buck regulator and LDO generate the necessary voltage rails for the device and can be used to power external circuits.

Sensorless trapezoidal control is highly configurable through register settings (MCT8316AV) or hardware pins (MCT8316AT) ranging from motor start-up behavior to closed loop operation. Register settings can be stored in non-volatile EEPROM, which allows the device to operate stand-alone once it has been configured. MCT8316A allows for a high level of monitoring; any variable in the algorithm can be displayed and observed as an analog output via two 12-bit DACs. This feature provides an effective method to tune speed loops as well as motor acceleration. The device receives a speed command through a PWM input, analog voltage, frequency input or I²C command.

In-built protection features include power-supply undervoltage lockout (UVLO), charge-pump undervoltage lockout (CPUV), overcurrent protection (OCP), AVDD undervoltage lockout (AVDD_UV), buck regulator UVLO, motor lock detection and overtemperature warning and shutdown (OTW and TSD). Fault events are indicated by the nFAULT pin with detailed fault information available in the registers.

The MCT8316A device is available in a 0.5-mm pin pitch, VQFN surface-mount package. The VQFN package size is 7 mm × 5 mm with a height of 1 mm.