描述 Description

The uP1728 is a high efficiency synchronous-rectified buckconverter with internal power switches. Fixed 1.2MHzPWM operation allows possible smallest output ripple andexternal component size. With high conversion efficiencyand small package, the uP1728 is ideally suitable forportable devices and USB/PCIE-based interface cards,where PCB area is especially concerned.

With internal low RDS(ON) switches, the uP1728 is capableof delivering 3.0A output current over a wide input voltagerange from 2.6V to 5.5V. The output voltage is adjustablefrom 0.6V to VIN by a voltage divider.

Other features include internal soft-start, chip enable, overvoltage,under-voltage, over-temperature and over-currentprotections. The uP1728 is available in a space-savingWDFN3x3-10L package.

特性 Features

·2.6V to 5.5V Input Voltage Range.
·Adjustable Output from 0.6V to VIN.
·Guaranteed 3.0A Output Current.
·Accurate Reference: 0.6V (±1%).
·Up to 95% Conversion Efficiency.
·Low Quiescent Current.
·Integrated Low RDS(ON) Upper and Lower MOSFET Switches: 80mΩ and 60mΩ.
·Current Mode PWM Operation.
·Fixed Frequency : 1.2MHz.
·100% Maximum Duty Cycle for Lowest Dropout.
·Internal Soft-Start.
·Over Voltage and Under Voltage Protection.
·Over Temperature and Over Current Protection.
·WDFN3x3-10L Package.
·RoHS Compliant and Halogen Fre.

應用 Application

·Battery-Powered Portable Devices.·MP3 Players.
·Notebook Computers.
·Wireless and DSL Modems.
·Personal Information Appliances.
·IP Phones.
·Digital Cameras.

·802.11 WLAN Power Supplies.
·FPGA/ASIC Power Supplies.
·Dynamically Adjustable Power Supply for CDMA/WCDMA Power Amplifiers.
·USB-Based xDSL Modems and Other Network Interface Cards.
·Point-of-Load Regulation