EN

IN

BIAS

GND

OUT

10 PF Ceramic

10 PF

Ceramic

1 PF

GND

GND

LP38855-x.x

LP38855

www.ti.com

SNVS461D – OCTOBER 2006 – REVISED APRIL 2013

1.5A Fast-Response High-Accuracy LDO Linear Regulator with Enable

Check for Samples: LP38855

1

FEATURES

DESCRIPTION

The

LP38855

is

a

high-current,

fast-response

2

•

regulator

which

can

maintain

output

voltage

•

regulation with an extremely low input to output

5.5V

voltage drop. Fabricated on a CMOS process, the

•

Stable with 10 µF Ceramic Capacitors

provides power for the internal bias and control

•

Dropout Voltage of 130 mV (Typical) at 1.5A

circuits, as well as drive for the gate of the N-MOS

Load Current

•

Precision Output Voltage Across All Line and

The use of an external bias rail allows the part to

Load Conditions:

regulators,

the

CMOS

architecture

consumes

–

extremely low quiescent current at any output load

–

±2.0% for 0°C

current. The use of an N-MOS power transistor

–

±3.0% for -40°C

results in wide bandwidth, yet minimum external

•

Over-Temperature and Over-Current

capacitance is required to maintain loop stability.

Protection

The fast transient response of this device makes it

•

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

suitable for use in powering DSP, Microcontroller

Packages

Core voltages and Switch Mode Power Supply post

regulators. The LP38855 is available in TO-220 and

•

DDPAK/TO-263 5-Lead packages.

are Available

Dropout Voltage: 130 mV (typical) at 1.5A load

•

-40°C to +125°C Operating Temperature Range

current.

APPLICATIONS

Low Ground Pin Current: 10 mA (typical) at 1.5A

load current.

•

ASIC Power Supplies In:

–

Desktops, Notebooks, and Graphics Cards,

pin is low.

Servers

–

Gaming Set Top Boxes, Printers and

Copiers

±2.0% for 0°C

conditions

•

Server Core and I/O Supplies

•

DSP and FPGA Power Supplies

•

SMPS Post-Regulator

Typical Application Circuit

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 © 2006–2013, 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.