The MPQ2451 is a high frequency, step-down, switching regulator with an integrated highvoltage high-side power MOSFET. It efficiently provides up to a 0.6A output with current-mode control for fast loop response. The wide 3.3V-to-36V input range accommodates a variety of automotive step-down applications, and the 3µA shutdown-mode quiescent current allows use in battery-powered applications. The MPQ2451 achieves high power-conversion efficiency over a wide load range by scaling down the switching frequency under light-load condition to reduce the switching and gate driving losses Frequency fold-back prevents inductor current runaway during start-up. Thermal shutdown provides reliable, fault-tolerant operation. The MPQ2451 is available in a cost-effective SOT23-6L and QFN-6L packagesGuaranteed Industrial/Automotive Temp. Range Limits 130µA Operating Quiescent Current Wide 3.3V-to-36V Operating Input Range 500mO Internal Power MOSFET 2MHz Fixed Switching Frequency Internally Compensated Stable with Ceramic Output Capacitors Internal Soft-Start Precision Current Limit Without Current Sensing Resistor >90% Efficiency Output Adjustable from 0.8V to 0.9·VIN 6-Lead SOT23 and QFN Packages Available in AEC-Q100 Grade 1