描述 Description

The uP1542S is a compact synchronous-rectified buckcontroller specifically designed to operate from 5V or 12Vsupply voltage and to deliver high quality output voltageas low as 0.6V for uP1542S/U (linear OCP).

The uP1542S adopts constant frequency, voltage modecontrol scheme, featuring easy-to-use, low externalcomponent count, and fast transient response. Fixed300kHz operation provides an optimal level of integrationto reduce size and cost of the power supply.

This controller integrates internal MOSFET drivers thatsupport 12V+12V bootstrapped voltage for high efficiencypower conversion. The bootstrap diode is built-in to simplifythe circuit design and minimize external part count.

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 PSOP-8L and WDFN2x2-8L package.

特性 Features

? Operates from 5V or 12V Supply Voltage
? 3.3V to 12V VIN Input Range
? VREF with 1.0% Accuracy: ?uP1542S/U: 0.6V VREF ?uP1542T/Q/V: 0.8V VREF

? Stand Alone Mode Operation
? Simple Single-Loop Control Design
? Voltage-Mode PWM Control
? Fast Transient Response
? Fixed 300kHz Switching Frequency

? High-Bandwidth Error Amplifier
? 0% to 90% Duty Cycle

? Lossless, Adjuatable Over Current Protection
? Uses Lower MOSFET RDS(ON)
? uP1542S/U: Linear OCP
? uP1542T/Q/V: Fixed OCP

? Internal Soft Start
? Integrated Boot Diode
? PSOP-8L and WDFN2x2-8L Package
? 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