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LP3871, LP3874

SNVS225H – FEBRUARY 2003 – REVISED JUNE 2015

LP387x 0.8-A Fast Ultra-Low-Dropout Linear Regulators

1 Features

3 Description

The LP3871 and LP3874 series of fast ultra-low-

1

•

Input Voltage: 2.5 V to 7 V

dropout linear regulators operate from a 2.5-V to 7-V

•

Ultra-Low-Dropout Voltage

input supply. Wide range of preset output voltage

•

Low Ground Pin Current

options are available. These ultra-low-dropout linear

regulators respond very quickly to step changes in

•

Load Regulation of 0.04%

load, which makes them suitable for low voltage

•

10-nA Quiescent Current in Shutdown Mode

microprocessor

applications.

The

devices

are

•

Specified Output Current of 0.8-A DC

developed on a CMOS process which allows low

quiescent current operation independent of output

•

Output Voltage Accuracy ±1.5%

load current. This CMOS process also allows the

•

ERROR Flag Indicates Output Status

LP3871 and LP3874 to operate under extremely low

•

SENSE Option Improves Load Regulation

dropout conditions.

•

Minimum Output Capacitor Requirements

Dropout Voltage: Ultra-low-dropout voltage; typically

•

Overtemperature/Overcurrent Protection

24 mV at 80-mA load current and 240 mV at 0.8-A

•

−40°C to +125°C Junction Temperature Range

load current.

Ground Pin Current: Typically 6 mA at 0.8-A load

2 Applications

current.

•

Microprocessor Power Supplies

Shutdown Mode: Typically 10-nA quiescent current

•

GTL, GTL+, BTL, and SSTL Bus Terminators

when the SD pin is pulled low.

•

Power Supplies for DSPs

ERROR Flag: ERROR flag goes low when the output

•

SCSI Terminator

voltage drops 10% below nominal value.

•

Post Regulators

SENSE: SENSE pin improves regulation at remote

•

High-Efficiency Linear Regulators

loads.

•

Battery Chargers

Precision Output Voltage: Multiple output voltage

•

Other Battery-Powered Applications

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).

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

SOT-223 (5)

6.50 mm x 3.56 mm

LP3871

LP3874

DDPAK/ TO-263 (5)

10.16 mm x 8.42 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Applications

*SD must be pulled high through a 10-k

Ω

pullup resistor. See Application and

*SD and ERROR pins must be pulled high

Implementation for more information.

through a 10-k

Ω pullup resistor. Connect

the ERROR pin to ground if this function is

not used. See Application and

Implementation for more information.

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.