1FEATURES

2• Ultra Low Dropout Voltage

• Stable with Selected Ceramic Capacitors

• Low Ground Pin Current

• Load Regulation of 0.08%

• 10nA Quiescent Current in Shutdown Mode

• Ensured Output Current of 3A DC

• Available in TO-263 and TO-220 Packages

• Output Voltage Accuracy ± 1.5%

• Error Flag Indicates Output Status

• Sense Option Improves Load Regulation

• Overtemperature/overcurrent Protection

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

APPLICATIONS

• Microprocessor Power Supplies

• Stable with Ceramic Output Capacitors

• GTL, GTL+, BTL, and SSTL Bus Terminators

• Power Supplies for DSPs

• SCSI Terminator

• Post Regulators

• High Efficiency Linear Regulators

• Battery Chargers

• Other Battery Powered Applications

DESCRIPTION

The LP3853/LP3856 series of fast ultra low-dropout

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

supply. Wide range of preset output voltage options

are available. These ultra low dropout linear

regulators respond very quickly to step changes in

load, which makes them suitable for low voltage microprocessor applications. The LP3853/LP3856 are

developed on a CMOS process which allows low

quiescent current operation independent of output

load current. This CMOS process also allows the

LP3853/LP3856 to operate under extremely low

dropout conditions.

Dropout Voltage: Ultra low dropout voltage; typically

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

current.

Ground Pin Current: Typically 4mA at 3A load

current.

Shutdown Mode: Typically 10nA quiescent current

when the shutdown pin is pulled low.

Error Flag:Error flag goes low when the output

voltage drops 10% below nominal value.

SENSE: Sense pin improves regulation at remote

loads.

Precision Output Voltage: Multiple output voltage

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

ensured accuracy of ±1.5% at room temperature, and ±3.0% over all conditions (varying line, load, and

temperature).