描述 Description

The FP6711 is a high efficiency, fixed frequency 500KHz, current mode PWM boost DC/DC converter which could operate from single/dual-cell NiCd, NiMH or alkaline battery such as input voltage below 1V. The converter output voltage can be adjusted from 1.8V to maximum 4V by an external resistor divider. Besides the converter includes a 0.35? N-channel MOSFET switch and 0.45Ω P-channel synchronous rectifier. So no external Schottky diode is required, and it could get better efficiency near 94%. The converter is based on a fixed frequency, current mode, pulse-width-modulation PWM controller that goes automatically into PFM mode at light load which quiescent current is only 25μA in this mode operation. The converter features a special function that the load is completely isolated from the battery during shutdown. Besides it also has auto-discharge function which could discharge the output capacitor immediately during shutdown. When converter operates into discontinuous mode, the internal anti-ringing switch will reduce interference and radiated electromagnetic energy. The FP6711 is available in a space-saving 10-lead MSOP package for portable application.

特性 Features

● Synchronous Rectification: 94% Efficiency
● Very Low Start-up Voltage at 0.85V
● Automatically Switch to PFM Mode for Improving Efficiency at Light Load
● Built-in True Shutdown: Isolation of Load from Battery during Shutdown
● Internal Anti-Ringing Switch across Inductor
● Low Battery Warning Display
● Fixed Frequency Operation at 500kHz
● Very Low Shutdown Current at 1μA
● Small 10-Pin MSOP Package
● RoHS Compliant

應(yīng)用 Application

● Handheld Instrument
● Cordless Phone
● Wireless Handset
● GPS Receiver
● MP3