PL82051(DC-DC降压IC)

1 Features

 3.5A continuous output current capability

 Up to 98% duty

 4.6V to 33V wide operating input range

 Integrated 40V, 80mΩ high side and 40V, 50mΩlow side power MOSFET switches

 Up to 97% efficiency

 CV/CC Mode control (Constant voltage and constantcurrent).

 Internal Soft-Start limits the inrush current at turn-on

 Fixed 160KHz Switching Frequency

 Internal compensation to save external components

 Pulse Skipping Mode to Achieve High Light LoadEfficiency

 Frequency jittering toease EMI Issue

 Peak Current-Mode Control

 Cycle-by-Cycle Over Current Protection

 Input over-voltage protection

 Output Over-Voltage Protection

 Output short protection

 Over-Temperature Protection

 Available in ESOP8 Package

2 Applications

 9-V, 12-V and 24-V Distributed Power Systems

 Consumer Applications Such as HomeAppliances,Set-Top Boxes, CPE Equipment, LCDDisplays, Peripherals, and Battery Chargers

 Industrial and Car Entertainment Power Supplies

3 Description

The PL82051 is a monolithicsynchronous buck regulator with wide operating input voltage range from 4.6to 33V.

Current mode control with internal slope compensation is implemented to reduce component count.

PL82051 also features a light load pulse skipping mode,which allows for a power loss reduction from the inputpower supply to the system at light loading.Frequency spread spectrum operation is introduced forEMI reduction.

A cycle-by-cycle current limit with frequency fold backprotects the IC at over loading condition.