MPQ4436 Synchronous Step-Down Converter

The MPQ4436 from Monolithic Power Systems is a frequency programmable, synchronous, step-down switching regulator with integrated internal high-side and low-side power MOSFETs. It provides 6 A or less of highly efficient output with current mode control for fast loop response. The wide 3.3 V to 45 V input range accommodates a variety of step-down applications in an automotive input environment. A 1.7 µA shutdown mode quiescent current allows the part to be used in battery-powered applications. High-power conversion efficiency over a wide load range is achieved by scaling down the switching frequency in light-load conditions to reduce the switching and gate driving losses. An open-drain power good signal indicates that the output is within 93% to 106% of its nominal voltage. Frequency foldback helps prevent inductor current runaway during start-up. Thermal shutdown provides reliable, fault-tolerant operation. High-duty cycle and low dropout mode are provided for the automotive cold crank condition. The MPQ4436 is available in a QFN-20 (4 mm x 4 mm) package.