VOUT

VIN

GND

LP3856-1.8

COUT*

10 PF

CIN*

INPUT

VOUT

10 PF

SD

SD

**

SENSE

1.8V, 3.0A

3.3V ± 10%

* TANTALUM OR

CERAMIC

VOUT

VIN

GND

LP3853-1.8

COUT*

10 PF

CIN*

INPUT

VOUT

10 PF

ERROR

**

SD

SD

**

ERROR

1.8V, 3.0A

3.3V ± 10%

* TANTALUM OR

CERAMIC

LP3853, LP3856

www.ti.com

SNVS173G – FEBRUARY 2003 – REVISED APRIL 2013

LP3853/LP3856 3A Fast Response Ultra Low Dropout Linear Regulators

Check for Samples: LP3853, LP3856

1

FEATURES

DESCRIPTION

The LP3853/LP3856 series of fast ultra low-dropout

2

•

Ultra Low Dropout Voltage

linear regulators operate from a +2.5V to +7.0V input

•

Stable with Selected Ceramic Capacitors

supply. Wide range of preset output voltage options

•

Low Ground Pin Current

are

available.

These

ultra

low

dropout

linear

regulators respond very quickly to step changes in

•

Load Regulation of 0.08%

load, which makes them suitable for low voltage

•

10nA Quiescent Current in Shutdown Mode

microprocessor applications. The LP3853/LP3856 are

•

Ensured Output Current of 3A DC

developed on a CMOS process which allows low

quiescent current operation independent of output

•

Available in TO-263 and TO-220 Packages

load current. This CMOS process also allows the

•

Output Voltage Accuracy ± 1.5%

LP3853/LP3856 to operate under extremely low

•

Error Flag Indicates Output Status

dropout conditions.

•

Sense Option Improves Load Regulation

Dropout Voltage: Ultra low dropout voltage; typically

•

Overtemperature/overcurrent Protection

39mV at 300mA load current and 390mV at 3A load

current.

•

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

Ground Pin Current: Typically 4mA at 3A load

APPLICATIONS

current.

•

Microprocessor Power Supplies

Shutdown Mode: Typically 10nA quiescent current

•

Stable with Ceramic Output Capacitors

when the shutdown pin is pulled low.

•

GTL, GTL+, BTL, and SSTL Bus Terminators

Error Flag:Error flag goes low when the output

voltage drops 10% below nominal value.

•

Power Supplies for DSPs

•

SCSI Terminator

SENSE: Sense pin improves regulation at remote

loads.

•

Post Regulators

•

High Efficiency Linear Regulators

Precision Output Voltage: Multiple output voltage

options are available ranging from 1.8V to 5.0V with a

•

Battery Chargers

ensured accuracy of ±1.5% at room temperature, and

•

Other Battery Powered Applications

±3.0% over all conditions (varying line, load, and

temperature).

Typical Application Circuits

**SD and ERROR pins must be pulled high through a 10k

Ω pull-up resistor. Connect the ERROR pin to ground if this

function is not used. See Application Hints for more information.

**SD pin must be pulled high through a 10k

Ω pull-up resistor. See Application Hints for more information.

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 © 2003–2013, 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.