TPS40075

www.ti.com TPS40075 SLUS676A – MAY 2006 – REVISED SEPTEMBER 2007 MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER WITH VOLTAGE FEED-FORWARD FEATURES 1 2 Operation Over 4.5-V to 28-V Input Range Fixed-Frequency Voltage-Mode Controller Integrated Unity Gain Amplifier for Remote Output Sensing Predictive Gate Drive™ Generation II for Improved Efficiency <1% Internal 700-mV Reference Input Voltage Feed Forward Control Prebiased Output Compatible Internal Gate Drive Outputs for High-Side and Synchronous N-Channel MOSFETs Switching Frequency Programmable to 1 MHz 20-Pin QFN Package Thermal Shutdown Protection Software Design Tool and EVM Available APPLICATIONS Power Modules Networking/Telecom Industrial Servers CONTENTS Device Ratings 2 Electrical Characteristics 4 Terminal Information 12 Application Information 15 Design Example 26 Additional References 40 The TPS40075 drives external N-channel MOSFETs using second generation Predictive Gate Drive to minimize conduction in the body diode of the low side FET and maximize efficiency. Pre-biased outputs are supported by not allowing the low side FET to turn on until the voltage commanded by the closed loop soft start is greater than the pre-bias voltage. Voltage feed forward provides good response to input transients and provides a constant PWM gain over a wide input voltage operating range to ease compensation requirements. Programmable short circuit protection provides fault current limiting ...