New H-bridge motor driver with on-chip power MOSFETs for driving reversible motors
The MP6611 from Monolithic Power Supplies is an H-bridge motor driver for reversible motors, which drives one dc motor, one winding of a stepper motor, or other loads.
The H-bridge consists of four N-channel power MOSFETs, and the gate-drive voltages are generated by an internal charge pump. With a motor power-supply voltage from 2.7 V to 36 V, the MP6611 can supply an output current of up to 8 A. When the motor driver is disabled, there is a very low standby circuit current.
A serial interface is used to set control modes. These control modes are for the speed and direction of the motor (PWM/DIR), the direction of motor rotation when a PWM signal is applied to either IN1 or IN2, and the generation of multiple independent PWM signals with independent PWM. The motor can also be controlled to run in parallel mode. The charge pump frequency, and slew rate can also be controlled with the serial interface.
Internal safety and diagnostic features include open load detection, over-current protection, input over- and under-voltage protection, in addition to over-temperature warning and thermal shutdown. There is also detection of an output short to the voltage input or ground, and an output which indicates that a fault has been detected.
Two versions of the MP6611 offer a serial peripheral interface (SPI) or a hardwired interface. The SPI offers flexibility in configuration in addition to fault diagnostics.
The MP6611 is available in a 20-pin, QFN package with a footprint of 4 mm x 4 mm.