Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number

(i.e. LX8117-28CSTT). "xx" refers to output voltage, please see table above.

DESCRIPTION

KEY FEA TURES

s 0.2% Line Regulation Maximum

s 0.4% Load Regulation Maximum

s Output Current Of 800mA

s Regulates Down To 1.2V Dropout

(LX8117) And 1.3V Dropout (LX8117A)

s Operates Down To 1V Dropout

s Space Saving SOT-223 Surface

Mount Package

s Guaranteed Dropout Voltage At Multiple

Current Levels

s Three-Terminal Adjustable Or Fixed 2.5V,

2.85V, 3.3V & 5V

The LX8117/8117A/8117B series are

positive Low Dropout (LDO) regulators.

At the designed maximum load current,

the LX8117 series dropout voltage is guar-

anteed to be 1.2V or lower at 0.8A

(LX8117A 1.3V @ 1A).

The dropout

voltage decreases with load current.

An adjustable output voltage version

of the LX8117/17A/17B is available, as

well as versions with fixed outputs of

2.5V, 2.85V, 3.3V and 5V.

The 2.85V

version is specifically designed for use

as a component of active termination

networks for the SCSI bus.

On-chip

trimming of the internal voltage reference

allows specification of the initial output

voltage to within ±1% of its nominal

value. The output current-limit point is

also trimmed, which helps to minimize

stress on both the regulator and the

system power source when they are

operated under short-circuit conditions.

The regulator's internal circuitry will

operate at input-to-output differential

voltages down to 1V.

Most regulator circuit designs include

output capacitors with values in the range

of tens to hundreds of microfarads or

more.

The LX8117/17A/17B typically

requires at least 10µF of output capaci-

tance for stable operation.

PNP-type regulators can waste current

equal to as much as 10 percent of their

output as a quiescent current which flows

directly to ground, bypassing the load.

Quiescent current from the LX8117/17A/

17B flows through the load, increasing

power-use efficiency and allowing cooler

operation.

The LX8117 is available in low-profile

plastic SOT-223 and D-Pak packages for

applications where space is at a premium.

The LX8117 is also available in a plastic

TO-263 package for instances when the

thermal resistance from the circuit die to

the environment must be minimized.

PRODUCT HIGHLIGHT

OF

LX8117-xx/8117A-xx/8117B-xx

APPLICA TIONS

s Battery Chargers

s Active SCSI Terminators

s 5V To 3.3V Linear Regulators

s High-Efficiency Linear Regulators

s Post Regulators For Switching Supplies

P ACKAGE ORDER INFORMA TION

T

Plastic SOT-223

3-pin

ST

Plastic T0-263

3-pin

DD

0.8A

LX8117-xxCST

LX8117-xxCDD

LX8117-xxCDT

0 to 125

1.0A

LX8117A-xxCST

LX8117A-xxCDD

LX8117A-xxCDT

1.2A

LX8117B-xxCST

LX8117B-xxCDD

LX8117B-xxCDT

LX8117/8117A/8117B-00

Adjustable

LX8117/8117A/8117B-25

2.5V

LX8117/8117A/8117B-28

2.85V

LX8117/8117A/8117B-33

3.3V

LX8117/8117A/8117B-05

5V

Part #

Output

Voltage

110

Ω

110

Ω

110

Ω

110

Ω

22µF

GND

OUT

IN

LX8117-28

10µF

18 to 27

Lines

4.75V to

5.25V

Plastic T0-252

(D-Pak) 3-pin

DT

Copyright © 1999

Rev. 1.4

3/99

1

NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.

O/P

Current