LP3871EMPX-3.3/NO.A中文资料德州仪器数据手册PDF规格书

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).