IN

OUT

S/D

ADJ

BYPASS

GND

LP3878-ADJ

**S/D

*0.01 µF

*4.7 µF

(Ceramic or

Tantalum

recommended)

*10 µF

(Ceramic

recommended)

R1

R2

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Design

LP3878-ADJ

SNVS311D – MAY 2005 – REVISED FEBRUARY 2015

LP3878-ADJ Micropower 800-mA Low-Noise "Ceramic Stable" Adjustable Voltage

Regulator for 1-V to 5-V Applications

1 Features

3 Description

The LP3878-ADJ is an 800-mA, adjustable output,

1

•

Input Supply Voltage: 2.5 V to 16V

voltage

regulator

designed

to

provide

high

•

Output Voltage Range: 1 V to 5.5 V

performance and low noise in applications requiring

•

Designed for Use With Low-ESR Ceramic

output voltages as low as 1 V.

Capacitors

Using an optimized VIP (Vertically Integrated PNP)

•

Very Low Output Noise

process,

the

LP3878-ADJ

delivers

superior

•

8-Lead SO PowerPAD™ and WSON Surface-

performance:

Mount Packages

•

Ground Pin Current: Typically 5.5 mA at 800-mA

load, and 180 µA at 100-µA load.

•

< 10-

μA Quiescent Current in Shutdown

•

Low Power Shutdown: The LP3878-ADJ draws

•

Low Ground Pin Current at all Loads

less than 10-

μA quiescent current when the

•

Overtemperature and Overcurrent Protection

SHUTDOWN pin is pulled low.

•

–40°C to 125°C Operating Junction Temperature

•

Precision

Output:

Ensured

output

voltage

Range

accuracy is 1% at room temperature.

•

Low Noise: Broadband output noise is only 18

μV

2 Applications

(typical) with a 10-nF bypass capacitor.

•

ASIC Power Supplies In:

Device Information(1)

–

Desktops, Notebooks, and Graphic Cards

PART NUMBER

PACKAGE

BODY SIZE (NOM)

–

Set Top Boxes, Printers, and Copiers

SO PowerPAD (8)

4.89 mm × 3.90 mm

LP3878-ADJ

•

DSP and FPGA Power Supplies

WSON (8)

4.00 mm × 4.00 mm

•

SMPS Post-Regulator

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

•

Medical Instrumentation

the end of the data sheet.

Basic Application Circuit

*Capacitor values shown are minimum required to assure stability. A larger output capacitor provides improved

dynamic response. Output capacitor must meet ESR requirements (see Application Information).

**The SHUTDOWN (or S/D) pin must be actively terminated (see Device Functional Modes). Tie to IN (pin 4) if not

used.

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.