LX8117-XX MICROSEMI [Microsemi Corporation], LX8117-XX Datasheet

LX8117-XX

Manufacturer Part Number

LX8117-XX

Description

0.8 , 1 & 1 .2A LOW DROPOUT POSI T I V E REGULATORS

Manufacturer

MICROSEMI [Microsemi Corporation]

Datasheet

1.LX8117-XX.pdf (11 pages)

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Rev. 1.5a,2005-10-25

H E

Low Dropout (LDO) regulators. At the designed

maximum load current, the LX8117 series

dropout voltage is guaranteed to be 1.2V or

lower at 0.8A (LX8117A 1.3V @ 1A). The

dropout voltage decreases with load current.

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

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

The LX8117/8117A/8117B series are positive

An adjustable output voltage version of the

4.75V to

5.25V

N F I N I T E

0 to 125

(°C)

O W E R

11861 W

CTIVE

10 µF

Current

Note: Available in Tape & Reel. Append the letter “TR” to the part number. (i.e. LX8117-00CST-TR)

P R O D U C T H I G H L I G H T

0.8A

1.0A

1.2A

O/P

LX8117-28

O F

ESTERN

ERMINATOR FOR

D E S C R I P T I O N

GND

N N O V A T I O N

RoHS Compliant / Pb-free

LX8117A-xxCST

LX8117B-xxCST

VENUE

OUT

Transition DC: 0522

LX8117-xxCST

Plastic SOT-223

3-Pin

, G

capacitors with values in the range of tens to

hundreds

LX8117/17A/17B typically requires at least

10µF of output capacitance for stable operation.

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.

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

environment must be minimized.

differential voltages down to 1V.

ARDEN

SCSI-2 B

Most regulator circuit designs include output

PNP-type regulators can waste current equal

The LX8117 is available in low-profile

PACKAGE ORDER INFO

I C R O S E M I

22 µF

ROVE

from

, CA. 92841, 714-898-8121, F

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

microfarads

0 . 8 , 1 & 1 . 2 A L

RoHS Compliant / Pb-free

the

LX8117A-xxCDD

LX8117B-xxCDD

Transition DC: 0535

LX8117-xxCDD

110 Ω

N C

circuit

Plastic TO-263

3-Pin

R O D U C T I O N

die

more.

18 to 27

Lines

O W

: 714-893-2570

The

the

R O P O U T

Available Options Per Part #

(x) – denotes O/P Current Setting

LX8117(x)-25

LX8117(x)-28

LX8117(x)-33

LX8117(x)-05

RoHS Compliant / Pb-free

LX8117A-xxCDT

LX8117B-xxCDT

Transition DC: 0532

LX8117-xxCDT

A T A

Part #

Plastic TO-252

(D-Pak) 3-Pin

0.2% Line Regulation Maximum

0.4% Load Regulation Maximum

Output Current Of 800mA

Regulates Down To 1.2V

Dropout (LX8117) And 1.3V

Dropout (LX8117A)

Operates Down To 1V Dropout

Space Saving SOT-223 Surface

Mount Package

Guaranteed Dropout Voltage At

Multiple Current Levels

Three-Terminal Adjustable Or

Fixed 2.5V, 2.85V, 3.3V & 5V

Battery Chargers

Active SCSI Terminators

5V To 3.3V Linear Regulators

High-Efficiency Linear

Regulators

Post Regulators For Switching

Supplies

O S I T I V E

K E Y F E A T U R E S

A P P L I C A T I O N S

H E E T

Output Voltage

E G U L A T O R S

2.5V

2.8V

3.3V

Related parts for LX8117-XX

LX8117-XX Summary of contents

Page 1

... Note: Available in Tape & Reel. Append the letter “TR” to the part number. (i.e. LX8117-00CST-TR) Copyright © 2000 Rev. 1.5a,2005-10-25 11861 W ESTERN LX8117-xx / 8117A-xx / 8117B- & differential voltages down to 1V. ...

Page 2

... LX8117-xx/8117A-xx/8117B-xx 0.8, 1 & 1. LUT E MAXIMU M RATINGS Power Dissipation .................................................................................. Internally Limited Input Voltage LX8117-00/8117A-00/8117B-00 (Adj.) ..................................................................... 15V LX8117-33/8117A-33/8117B-33 (3.3V), LX8117-05/8117A-05/8117B-05 (5.0V) .... 15V LX8117-25/8117A-25/8117B-25 (2.5V), LX8117-28/8117A-28/8117B-28 (2.85V) .. 12V Surge Voltage ...

Page 3

... Symbol 0.8A for the LX8117-xx 1.0A for the LX8117A-xx, and I MAX MAX Test Conditions 10mA 2V 25° ...

Page 4

... LX8117-xx/8117A-xx/8117B-xx 0.8, 1 & 1.2A L LX8117-25 / 8117A-25 / 8117B-25 (2.5V Fixed) Parameter Output Voltage Line Regulation (Note 3) Load Regulation (Note 3) Dropout Voltage (Note 4) LX8117-25 LX8117A/B-25 Current Limit LX8117-25 LX8117A-25 LX8117B-25 Quiescent Current Thermal Regulation ...

Page 5

... Dropout voltage is specified over the full output current range of the device. Dropout voltage is defined as the minimum input/output differential measured at the specified output current. Test points and limits are also shown on the Dropout Voltage Curve. 5. Minimum load current is defined as the minimum output current required to maintain regulation. Copyright © 1999 Rev. 1.5a LX8117-xx/8117A-xx/8117B- ...

Page 6

... SOA circuit, based on the large input-to-output voltage across the regulator at the time the short circuit is removed from the output Minumum Load (Larger resistor) IN OUT LX8117-xx Full Load (Smaller resistor) ADJ Star Ground Copyright © ...

Page 7

... FIGURE 3 — CONNECTIONS FOR BEST LOAD REGULATION LX8117-xx OUT IN V OUT ADJ V R1 REF I ADJ 50µ REF ADJ R1 R2+ Actual parasitic line resistance Parasitic LX8117-xx Line Resistance OUT ADJ Connect R1 to Case of Regulator Connect R2 to Load . Peff L 7 ...

Page 8

... LX8117-xx/8117A-xx/8117B-xx 0.8, 1 & 1.2A L LOAD REGULATION (continued) Even when the circuit is optimally configured, parasitic resistance can be a significant source of error. A 100 mil (2.54 mm) wide PC trace built from 1 oz. copper-clad circuit board material has a parasitic resistance of about 5 milliohms per inch of its length at room temperature ...

Page 9

... C1 10µF* * Needed if device is far from filter capacitors FIGURE 5 — 1. ADJUSTABLE REGULATOR LX8117-33 V OUT IN IN GND FIGURE 6 — FIXED 3.3V OUTPUT REGULATOR ) DROPOUT (MAX LX8117-xx OUT IN ADJ R1 121 C2 C1* 100µF 10µ 1.25V 1 + OUT R1 3.3V Min. 15µF Tantalum or 100µ ...

Page 10

... LX8117-xx / 8117A-xx / 8117B-xx 0.8, 1 & 1. 3-Pin Plastic SOT-223 3-Pin Plastic TO-263 0° -8° ROPOUT OSITIVE ...

Page 11

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