MP6550 H-Bridge Motor Driver

The MP6550 from Monolithic Power Systems is an H-bridge motor driver consisting of four N-channel power MOSFETs and an internal charge pump to generate gate-drive voltages. The MP6550 is typically used to drive a DC brush motor. According to the logic control, the device operates on a motor power supply voltage from 1.8 V to 22 V, which can supply an output current of up to 2 A. The MP6550 has a PWM input interface, which is compatible with industry-standard devices. Very low standby circuit current can be achieved when the device is disabled. An internal current-sensing circuit provides an output with a voltage proportional to the load current. Cycle-by-cycle current regulation and limiting is also provided. These features do not require the use of a low-value shunt resistor. There are internal shutdown functions for overcurrent protection, short-circuit protection, undervoltage lockout, and overtemperature protection. The MP6550 requires a minimal number of readily available, standard external components and is available in a QFN-12 (2 mm x 2 mm) package.