LP38856

3A Fast-Response High-Accuracy LDO Linear Regulator

with Enable

General Description

The LP38856 is a high-current, fast-response regulator

which can maintain output voltage regulation with an ex-

tremely low input to output voltage drop. Fabricated on a

CMOS process, the device operates from two input voltages:

V

cuits, as well as drive for the gate of the N-MOS power

transistor, while V

an external bias rail allows the part to operate from ultra low

V

ture consumes extremely low quiescent current at any out-

put load current. The use of an N-MOS power transistor

results in wide bandwidth, yet minimum external capacitance

is required to maintain loop stability.

The fast transient response of this device makes it suitable

for use in powering DSP, Microcontroller Core voltages and

Switch Mode Power Supply post regulators. The LP38856 is

available in TO-220 and TO-263 5-Lead packages.

Dropout Voltage: 240 mV (typical) at 3A load current.

Low Ground Pin Current: 14 mA (typical) at 3A load cur-

rent.

Shutdown Current: 1 µA (typical) I

low.

for 0˚C

≤ T

J

≤ +125˚C, across all line and load conditions

Features

n

Standard V

n

Stable with 10 µF ceramic capacitors

n

Dropout voltage of 240 mV (typical) at 3A load current

n

Precision Output Voltage across all line and load

conditions:

≤ T

J

≤ +125˚C

≤ T

J

≤ +125˚C

n

Over-Temperature and Over-Current protection

n

Available in 5 lead TO-220 and TO-263 packages

n

Custom V

available

n

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

Applications

n

ASIC Power Supplies In:

- Desktops, Notebooks, and Graphics Cards, Servers

- Gaming Set Top Boxes, Printers and Copiers

n

Server Core and I/O Supplies

n

DSP and FPGA Power Supplies

n

SMPS Post-Regulator

Typical Application Circuit

20131101

June 2006

© 2006 National Semiconductor Corporation

DS201311

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