OUT

S/D

0.1 PF

10 PF

Ceramic

OUT

S/D

GND

IN

BIAS

LP38843

IN

BIAS

5V

± 10%

GND

GND

4.7 PF

*

LP38843

www.ti.com

SNVS290C – DECEMBER 2004 – REVISED APRIL 2013

LP38843 3A Ultra Low Dropout Linear Regulators

Stable with Ceramic Output Capacitors

Check for Samples: LP38843

1

FEATURES

DESCRIPTION

The

LP38843

is

a

high-current,

fast-response

2

•

Ideal for Conversion From 1.8V or 1.5V Inputs

regulator

which

can

maintain

output

voltage

•

Designed for use with low ESR Ceramic

regulation with minimum input to output voltage drop.

Capacitors

Fabricated on a CMOS process, the device operates

•

0.8V, 1.2V and 1.5V Standard Voltages

from two input voltages: Vbias provides voltage to

drive the gate of the N-MOS power transistor, while

Available

Vin is the input voltage which supplies power to the

•

Ultra Low Dropout Voltage (210mV at 3A typ)

load. The use of an external bias rail allows the part

•

1.5% Initial Output Accuracy

to operate from ultra low Vin voltages. Unlike bipolar

•

Load Regulation of 0.1%/A (Typical)

regulators,

the

CMOS

architecture

consumes

extremely low quiescent current at any output load

•

30nA Quiescent Current in Shutdown (Typical)

current. The use of an N-MOS power transistor

•

Low Ground Pin Current at all Loads

results in wide bandwidth, yet minimum external

•

Over Temperature/Over Current Protection

capacitance is required to maintain loop stability.

•

Available in 5 Lead TO-220 and DDPAK/TO-263

The fast transient response of these devices makes

Packages

them

suitable

for

use

in

powering

DSP,

Microcontroller Core voltages and Switch Mode

•

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

Power Supply post regulators. The parts are available

in TO-220 and DDPAK/TO-263 packages.

APPLICATIONS

Dropout Voltage: 210 mV (typ) at 3A load current.

•

ASIC Power Supplies In:

–

Desktops, Notebooks, and Graphics Cards,

Quiescent Current: 30 mA (typ) at full load.

Servers

Shutdown Current: 30 nA (typ) when S/D pin is low.

–

Gaming Set Top Boxes, Printers and

Precision Output Voltage: 1.5% room temperature

Copiers

accuracy.

•

Server Core and I/O Supplies

•

DSP and FPGA Power Supplies

•

SMPS Post-Regulator

TYPICAL APPLICATION CIRCUIT

* Minimum value required if Tantalum capacitor is used (see Application Hints).

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2013, 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.