Abstract: A fully integrated and H-bridge DC motor driver with excellent dynamic performance and comprehensive fail-safe function has been implemented in CSMC 0.5-μm HV CMOS technology. In addition to operation with four basic modes, such as idle, forward, reverse and brake, this IC also can drive motor with two kinds of speed regulated modes: pulse width modulator (PWM) signal and analog voltage. The IC integrates comprehensive fail-safe circuits, including the under voltage protection circuit, over-temperature protection circuit and overcurrent protection circuit. The measured results of packaged IC sample show that all drive modes operated well. The power MOSFET's on resistance are about 0.65 Ω、0.8 Ω and1 Ω when supply voltage were 5 V、4 V and 3 V, respectively. The IC can output a maximum of 1 A dc current within a supply voltage range of 2.5-5.5 V.