LP3961ES-1.8 National Semiconductor, LP3961ES-1.8 Datasheet

LP3961ES-1.8

Manufacturer Part Number

LP3961ES-1.8

Description

Manufacturer

National Semiconductor

Datasheet

1.LP3961ES-1.8.pdf (20 pages)

Specifications of LP3961ES-1.8

Case

TO263-6

Date_code

2005+

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LP3961/LP3964

800mA Fast Ultra Low Dropout Linear Regulators

General Description

The LP3961/LP3964 series of fast ultra low-dropout linear

regulators operate from a +2.5V to +7.0V input supply. Wide

range of preset output voltage options are available. These

ultra low dropout linear regulators respond very fast to step

changes in load which makes them suitable for low voltage

microprocessor applications. The LP3961/LP3964 are de-

veloped on a CMOS process which allows low quiescent

current operation independent of output load current. This

CMOS process also allows the LP3961/LP3964 to operate

under extremely low dropout conditions.

Dropout Voltage: Ultra low dropout voltage; typically 24mV

at 80mA load current and 240mV at 800mA load current.

Ground Pin Current: Typically 4mA at 800mA load current.

Shutdown Mode: Typically 15µA quiescent current when

the shutdown pin is pulled low.

Error Flag: Error flag goes low when the output voltage

drops 10% below nominal value (for LP3961).

SENSE: Sense pin improves regulation at remote loads.

(For LP3964)

Precision Output Voltage: Multiple output voltage options

are available ranging from 1.2V to 5.0V and adjustable, with

a guaranteed accuracy of

ture).

Typical Application Circuits

# Minimum output capacitance is 10 µF to ensure stability over full load current range. More capacitance provides superior dynamic performance and additional

stability margin.

*SD and ERROR pins must be pulled high through a 10k pull-up resistor. Connect the ERROR pin to ground if this function is not used. See applications sec-

tion for more information.

3.0% over all conditions ( varying line, load, and tempera-

1.5% at room temperature, and

DS101129

Features

n Ultra low dropout voltage

n Low ground pin current

n Load regulation of 0.02%

n 15µA quiescent current in shutdown mode

n Guaranteed output current of 0.8A DC

n Available in SOT-223,TO-263 and TO-220 packages

n Output voltage accuracy

n Error flag indicates output status (LP3961)

n Sense option improves better load regulation (LP3964)

n Extremely low output capacitor requirements

n Overtemperature/overcurrent protection

n −40˚C to +125˚C junction temperature range

Applications

n Microprocessor power supplies

n GTL, GTL+, BTL, and SSTL bus terminators

n Power supplies for DSPs

n SCSI terminator

n Post regulators

n High efficiency linear regulators

n Battery chargers

n Other battery powered applications

1.5%

www.national.com

DS101129-1

May 2000

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