LP3963, LP3966

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SNVS067H – APRIL 2000 – REVISED APRIL 2013

LP3963/LP3966 3A Fast Ultra Low Dropout Linear Regulators

Check for Samples: LP3963, LP3966

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FEATURES

DESCRIPTION

The LP3963/LP3966 series of fast ultra low-dropout

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•

Ultra Low Dropout Voltage

linear regulators operate from a +2.5V to +7.0V input

•

Low Ground Pin Current

supply. Wide range of preset output voltage options

•

Load Regulation of 0.06%

are

available.

These

ultra

low

dropout

linear

regulators respond very quickly to step changes in

•

15µA Quiescent Current in Shutdown Mode

load which makes them suitable for low voltage

•

Specified Output Current of 3A DC

microprocessor applications. The LP3963/LP3966 are

•

Available in DDPAK/TO-263 and TO-220

developed on a CMOS process which allows low

Packages

quiescent current operation independent of output

load current. This CMOS process also allows the

•

Output Voltage Accuracy ± 1.5%

LP3963/LP3966 to operate under extremely low

•

Error Flag Indicates Output Status (LP3963)

dropout conditions.

•

Sense Option Improves Load Regulation

Dropout Voltage: Ultra low dropout voltage; typically

(LP3966)

80mV at 300mA load current and 800mV at 3A load

•

Minimum Output Capacitor Requirements

current.

•

Overtemperature/Overcurrent Protection

Ground Pin Current: Typically 6mA at 3A load

•

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

current.

Shutdown Mode: Typically 15µA quiescent current

APPLICATIONS

when the shutdown 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 (for LP3963).

•

Power Supplies for DSPs

SENSE: Sense pin improves regulation at remote

•

SCSI Terminator

loads. (For LP3966)

•

Post Regulators

Precision Output Voltage: Multiple output voltage

•

High Efficiency Linear Regulators

options are available ranging from 1.2V to 5.0V and

adjustable (LP3966), with a specified accuracy of

•

Battery Chargers

±1.5% at room temperature, and ±3.0% over all

•

Other Battery Powered Applications

conditions (varying line, load, and temperature).

Typical Application Circuits

*SD and ERROR pins must be pulled high through a 10k

Ω pull-up resistor. Connect the ERROR pin to ground if this

function is not used. See Application Hints for more information.

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PRODUCTION DATA information is current as of publication date.

Copyright © 2000–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.