1 Features
1• Input Voltage: 2.5 V to 7 V
• Ultra-Low-Dropout Voltage
• Low Ground Pin Current
• Load Regulation of 0.04%
• 10-nA Quiescent Current in Shutdown Mode
• Specified Output Current of 0.8-A DC
• Output Voltage Accuracy ±1.5%
• ERROR Flag Indicates Output Status
• SENSE Option Improves Load Regulation
• Minimum Output Capacitor Requirements
• Overtemperature/Overcurrent Protection
• −40°C to +125°C Junction Temperature Range

2 Applications
• Microprocessor Power Supplies
• GTL, GTL+, BTL, and SSTL Bus Terminators
• Power Supplies for DSPs
• SCSI Terminator
• Post Regulators
• High-Efficiency Linear Regulators
• Battery Chargers
• Other Battery-Powered Applications

3 Description
The LP3871 and LP3874 series of fast ultra-low-
dropout linear regulators operate from a 2.5-V to 7-V input supply. Wide range of preset output voltage
options are available. These ultra-low-dropout linear
regulators respond very quickly to step changes in
load, which makes them suitable for low voltage microprocessor applications. The devices are
developed on a CMOS process which allows low
quiescent current operation independent of output
load current. This CMOS process also allows the
LP3871 and LP3874 to operate under extremely low dropout conditions.
Dropout Voltage: Ultra-low-dropout voltage; typically
24 mV at 80-mA load current and 240 mV at 0.8-A
load current.
Ground Pin Current: Typically 6 mA at 0.8-A load current.
Shutdown Mode: Typically 10-nA quiescent current
when the SD pin is pulled low.
ERROR Flag: ERROR flag goes low when the output
voltage drops 10% below nominal value.
SENSE: SENSE pin improves regulation at remote
loads.
Precision Output Voltage: Multiple output voltage
options are available ranging from 1.8 V to 5 V with a
ensured accuracy of ±1.5% at room temperature, and
±3% over all conditions (varying line, load, and
temperature).