描述 Description

The uP3861P is a compact dual-channel synchronousrectified buck controller specifically designed to operatewith single 12V supply voltage and to deliver high qualityoutput voltage for high power application. The two channelsare operated with 180 degree phase interleaved. The twochanneloutput voltage has power on sequence set. Itadopts external compensated voltage mode control totightly regulate the feedback voltage to internal 1V referencevoltage. The switching frequency is programmable from50KHz to 400KHz, providing an optimal level of integratingto reduce size and const of the power supply.

The uP3861P integrates MOSFET drives that supply12V+12V bootstrapped voltage for high efficiency powerconversion. The bootstrap diode is built-in to simplify thecircuit design and minimize external part count.

Other features include under voltage lockout (UVLO), undervoltage protection ,over voltage protection (OVP) and userprogrammable over temperature protection (OTP). Withaforementioned functions, this part provides customers acompact, high efficiency, well-protected and cost-effectivesolutions. This part is available in SOP-20L package.

特性 Features

·Dual Channel Synchronous Buck PWM Controller
·Operates Single with 12V Supply Voltage
·Wide Output Voltage Range 1V +/- 0.8%
·High-Side MOSFET’s RDS(ON) Sensing
·Programmable Frequency Range from 50 kHz to 400kHz
·Voltage-Mode PWM Control
·0% to 90% Duty Cycle
·Shutdown and Soft-start Function
·UVP Specification is Implemented at 50% of VREF
·OVP Specification is Implemented at 120% of VREF
·Soft-Start
·Both Channels with 180 Degree Phase shift
·Integrated Boot Diode
·Over-Temperature Protection
·Sequence ON/OFF Controller
·SOP-20L Package
·RoHS Compliant and Halogen Free

應(yīng)用 Application

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