描述 Description

The uP1540 is a compact synchronous-rectified buckcontroller specifically designed to operate from 5V or 12Vsupply voltage and to deliver high quality output voltageas low as 0.8V.

The uP1540 adopts proprietary RCOTTM technology,providing flexible selection of output LC filter and excellenttransient response to load and line change. The uP1540supports stand-alone mode operation.

This controller integrates internal MOSFET drivers thatsupport 12V+12V or 5V+19V bootstrapped voltage for highefficiency power conversion. The bootstrap diode is builtinto simplify the circuit design and minimize external partcount.

Other features include internal soft start, over/undervoltage protection, over current protection and shutdownfunction. With aforementioned functions, this part providescustomers a compact, high efficiency, well-protected andcost-effective solutions. This part is available in WDFN3x3- 10L and PSOP - 8L packages.

特性 Features

·Operates from 5V or 12V Supply Voltage
·3.3V to 12V VIN Input Range
·Support VCC = 5V, VIN = 19V
·0.8V VREF with 1.0% Accuracy

·Support DEM for High Light Load Efficiency
·Compensated Constant On Time Operation
·Quasi Constant Frequency Operation
·Fast Transient Response
·Smooth Mode Transition

·Lossless, Adjustable Over Current Protection
·Uses Lower MOSFET RDS(ON)

·Internal Soft Start
·Over Voltage and Under Voltage Protection
·Integrated Bootstrap Diode
·WDFN3x3 - 10L and PSOP - 8L Packages
·RoHS Compliant and Halogen Free

應(yīng)用 Application

·Power Supplies for Microprocessors or Subsystem Power Supplies
·Cable Modems, Set Top Boxes, and DSL Modems
·Industrial Power Supplies; General Purpose Supplies
·5V or 12V Input DC-DC Regulators
·Low-Voltage Distributed Power Supplies