Beschreibung
The MPQ4558 is a high-frequency, step-down switching regulator with an integrated internal high-side high-voltage power MOSFET. It provides up to a 1A output with current-mode control for fast loop response and easycompensation.The wide 3.8V-to-55V input range accommodates a variety of step-down applications, including automotive input. A 12µA shutdown-mode supplycurrent makes it suitable for battery-powered applications.A scaled-down switching frequency in light-load conditions provides high power-conversion efficiency over a wide load range while reducing switching and gate driver losses.The frequency fold-back prevents inductor current runaway during startup and thermal shutdown provides reliable, fault-tolerant operation.By switching at 2MHz, the MPQ4558 can prevent EMI (electromagnetic interference) noise problems, such as those found in AM radio andADSL applications.The MPQ4558 is available in an SOIC8E and a 10-pin 3mm x 3mm QFN package.