Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

LP3872, LP3875

SNVS227H – FEBRUARY 2003 – REVISED JANUARY 2015

LP387x 1.5-A Fast Ultra-Low-Dropout Linear Regulators

1 Features

3 Description

The LP387x series of fast ultra low-dropout linear

1

•

Input Voltage Range: 2.5 V to 7 V

regulators operate from a 2.5-V to 7-V input supply.

•

Ultra Low-Dropout Voltage

Wide range of preset output voltage options are

•

Low Ground Pin Current

available. These ultra low-dropout linear regulators

respond very quickly to step changes in load, which

•

Load Regulation of 0.06%

makes them suitable for low-voltage microprocessor

•

10-nA Quiescent Current in Shutdown Mode

applications. The LP3872 and LP3875 are developed

•

Ensured Output Current of 1.5-A DC

on a CMOS process which allows low quiescent

current operation independent of output load current.

•

Available in DDPAK/TO-263, TO-220, and

This CMOS process also allows the LP3872 and

SOT-223 Packages

LP3875 to operate under extremely low dropout

•

Output Voltage Accuracy ± 1.5%

conditions.

•

ERROR Flag for Output Status

Dropout Voltage: Ultra low-dropout voltage; typically

•

Sense Option Improves Load Regulation

38 mV at 150-mA load current and 380 mV at 1.5-A

•

Minimum Output Capacitor Requirements

load current.

•

Overtemperature/Overcurrent Protection

Ground Pin Current: Typically 6 mA at 1.5-A load

•

−40°C to 125°C Junction Temperature Range

current.

Shutdown Mode: Typically 10-nA quiescent current

2 Applications

when the SD pin is pulled low.

•

Microprocessor Power Supplies

ERROR Flag: ERROR flag goes low when the output

•

GTL, GTL+, BTL, and SSTL Bus Terminators

voltage drops 10% below nominal value (LP3872

•

Power Supplies for DSPs

only).

•

SCSI Terminators

SENSE: Sense pin improves regulation at remote

•

Post Regulators

loads (LP3875 only).

•

High Efficiency Linear Regulators

Precision Output Voltage: Multiple output voltage

options are available ranging from 1.8 V to 5 V with a

•

Battery Chargers

specified accuracy of ±1.5% at room temperature,

•

Other Battery-Powered Applications

and ±3.0% over all conditions (varying line, load, and

space

temperature).

space

Device Information(1)

space

PART NUMBER

PACKAGE

BODY SIZE (NOM)

space

SOT-223 (5)

6.50 mm × 3.56 mm

space

LP3872

TO-263 (5)

10.16 mm × 8.42 mm

LP3872 Typical Application Circuit

SOT-223 (5)

6.50 mm × 3.56 mm

LP3875

TO-263 (5)

10.16 mm × 8.42 mm

TO-220 (5)

14.986 mm × 10.16 mm

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

the end of the datasheet.

LP3875 Typical Application Circuit

*SD and ERROR pins must be pulled high

through a 10-k

Ω pullup resistor. Connect

the ERROR pin to ground if this function is

not used. See the Shutdown Mode and

ERROR Flag Operation sections.

*SD must be pulled high through a 10-k

Ω

pullup resistor. See the Shutdown Mode

section.

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.