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一、Features

? Vin Range up to 40V

? Output range:1.5V～5.0V

? Maximum output current: 250mA

? PSRR: 80dB @1KHz

? Dropout voltage:400mV @ IOUT=100mA

? Ultra low quiescent current:1.5μA Typ.

? Output voltage tolerances of ±2% Overthe temperature range

? Internal thermal overload protection

? Built-in Short-Circuit Protection, CurrentLimiter

二、Applications

? E-meters, Water Meters and Gas Meters

? Cellphones, radiophone, digital cameras

? Fire Alarm, Smoke Detector

? Appliances and White Goods

三、General Description

The XR5550 is ultra-low quiescent currentregulator features low dropout voltage and lowcurrent in the standby mode. With less than1.5μA quiescent current at no load, the

XR5550 is ideally suited for standby microcontrol-unit systems, especially for always-onapplications like E-meters, fire alarms, smokedetectors and other battery-operated systems.

The XR5550 retains all of the features that arecommon to low dropout regulators including a