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LP38500/2-ADJ, LP38500A/2A-ADJ 1.5A FlexCap Low Dropout Linear Regulator for 2.7V to 5.5V

Inputs

May 19, 2008

LP38500/2-ADJ, LP38500A/2A-ADJ

1.5A FlexCap Low Dropout Linear Regulator for 2.7V to

5.5V Inputs

General Description

National's FlexCap LDO's feature unique compensation that

allows the use of any type of output capacitor with no limits

on minimum or maximum ESR. The LP38500/2 series of low-

dropout linear regulators operates from a +2.7V to +5.5V input

supply. These ultra low dropout linear regulators respond very

quickly to step changes in load, which makes them suitable

for low voltage microprocessor applications. Developed on a

CMOS process, (utilizing a PMOS pass transistor), the

LP38500/2 has low quiescent current that changes little with

load current.

Ground Pin Current:

Typically 2 mA at 1.5A load current.

Disable Mode:

Typically 25 nA quiescent current when the

Enable pin is pulled low.

Simplified Compensation:

Stable with any type of output

capacitor, regardless of ESR.

Precision Output:

"A" grade versions available with 1.5%

V

ADJ

tolerance (25擄C) and 3% over line, load and tempera-

ture.

Features

鈻?/div>

FlexCap: Stable with ceramic, tantalum, or aluminum

鈻?/div>

capacitors

Stable with 10 碌F input/output capacitor

Adjustable output voltage from 0.6V to 5V

Low ground pin current

25 nA quiescent current in shutdown mode

Guaranteed output current of 1.5A

Available in TO-263, TO-263 THIN, and LLP-8 packages

Guaranteed V

ADJ

accuracy of 鹵1.5% @ 25擄C (A Grade)

Guaranteed accuracy of 鹵3.5% @ 25擄C (STD)

Over-Temperature and Over-Current protection

鈭?0擄C to +125擄C operating T

J

range

Enable pin (LP38502)

Applications

鈻?/div>

ASIC Power Supplies In:

Printers, Graphics Cards, DVD Players

Set Top Boxes, Copiers, Routers

鈻?/div>

DSP and FPGA Power Supplies

鈻?/div>

SMPS Regulator

鈻?/div>

Conversion from 3.3V or 5V Rail

Typical Application Circuit

30036119

漏 2008 National Semiconductor Corporation

300361

www.national.com

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