描述 Description

The uP8808P/Q is an ultra low noise, fast response, highpower supply rejection ratio (PSRR) low dropout regulatorspecifically designed to continuously deliver up to 1.5Aoutput current. Designed with a P-channel MOSFET seriespass transistor, the uP8808P/Q yields extremely lowdropout voltage (e.g. 240mV at 1A) and maintains verylow ground current (200uA).

The uP8808P/Q is designed and optimized to work withlow-value, low-cost ceramic capacitors. Only a 4.7uFceramic output capacitor is required for stable operationfor any load conditions, ideal suitable for portable RF andwireless applications where PCB size are speciallyconcerned. A bypass pin is provided to reduce output noisevoltage and improve PSRR to 35dB at 100kHz.

Other features include foldback overcurrent protection,quick soft start, and overtemperature protection. TheuP8808P/Q is available in fixed output voltage from 0.8Vto 3.3V with 0.1V per step. The device comes in SOT223-3L and TO252-3L packages.

特性 Features

? Wide Input Voltage Range from 2.2 to 5.5V
? Ultra Low Dropout Voltage: 240mV @ 1A
? High Power Supply Rejection Ratio
? 60dB at 100Hz
? 35dB at 100kHz
? Ultra Low Output Noise Voltage: 50uV(RMS)
? Ultra Fast Response to Line/Load Transient
? Stable with 4.7uF Ceramic Output Capacitor
? Low Ground Current: 200uA
? Low Shutdown Current: < 1uA
? Foldback Output Current Limit
? High Output Accuracy
? 1.5% Initial Accuracy
? Fixed Output Voltages: 0.8V to 3.3V with 0.1V Per Step

? Over-Temperature Protection
? RoHS Compliant and Halogen Free

應(yīng)用 Application

? Cellular and Cordless Phones
? Bluetooth Portable Radios and Accessaries
? Battery-Powered Equipments
? Laptop, Palmtops, Notebook Computers
? Hand-Held Instruments
? PCMCIA Cards
? Portable Information Appliances