LX8117-05 MICROSEMI [Microsemi Corporation], LX8117-05 Datasheet

LX8117-05

Manufacturer Part Number

LX8117-05

Description

0.8, 1 & 1.2A LOW DROPOUT POSITIVE REGULATORS

Manufacturer

MICROSEMI [Microsemi Corporation]

Datasheet

1.LX8117-05.pdf (9 pages)

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Rev. 1.4

H E

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).

voltage decreases with load current.

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.

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

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

An adjustable output voltage version

3/99

N F I N I T E

4.75V to

5.25V

0 to 125

11861 W

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

(°C)

O W E R

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

CTIVE

10µF

The dropout

ESTERN

LX8117-28

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

Current

ERMINATOR FOR

On-chip

O F

D E S C R I P T I O N

GND

0.8A

1.0A

1.2A

O/P

I N

VENUE

P A C K A G E O R D E R I N F O R M A T I O N

OUT

N N O V A T I O N

I N I T Y

, G

operate at input-to-output differential

voltages down to 1V.

output capacitors with values in the range

of tens to hundreds of microfarads or

more.

requires at least 10µF of output capaci-

tance for stable operation.

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.

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.

ARDEN

Most regulator circuit designs include

PNP-type regulators can waste current

The LX8117 is available in low-profile

LX8117A-xxCST

LX8117B-xxCST

SCSI-2 B

LX8117-xxCST

Plastic SOT-223

3-pin

22µF

The LX8117/17A/17B typically

ROVE

I C R O E L E C T R O N I C S

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

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

110

0.8, 1 & 1.2A L

LX8117A-xxCDD

LX8117B-xxCDD

LX8117-xxCDD

Plastic T0-263

3-pin

18 to 27

Lines

R O D U C T I O N

O W

N C

LX8117/8117A/8117B-00

LX8117/8117A/8117B-25

LX8117/8117A/8117B-28

LX8117/8117A/8117B-33

LX8117/8117A/8117B-05

Part #

R O P O U T

VA I L A B L E

LX8117A-xxCDT

LX8117B-xxCDT

: 714-893-2570

LX8117-xxCDT

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

Plastic T0-252

(D-Pak) 3-pin

K E Y F E A T U R E S

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

A T A

O S I T I V E

P T I O N S P E R

LIN D

H E E T

E G U L AT O R S

O C

Adjustable

#: 8117

Voltage

Output

2.85V

2.5V

3.3V

A RT

Related parts for LX8117-05

LX8117-05 Summary of contents

Page 1

... T (°C) A Current 0. 125 1.0A 1.2A 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 Copyright © 1999 11861 W A Rev. 1.4 3/99 ESTERN LX8117-xx/8117A-xx/8117B-xx 0.8, 1 & ...

Page 2

... 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 ............................................................................................................... 15V Operating Junction Temperature Plastic (ST, DD & DT Packages) .......................................................................... 150°C Storage Temperature Range ...................................................................... -65° ...

Page 3

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

Page 4

... LX8117-xx/8117A-xx/8117B-xx 0.8, 1 & 1. LX8117-25 / 8117A-25 / 8117B-25 (2.5V Fixed) Parameter Output Voltage Line Regulation (Note 3) Load Regulation (Note 3) ...

Page 5

... LX8117-33 I LX8117A-33 LX8117B-33 Quiescent Current Thermal Regulation Ripple Rejection Temperature Stability Long Term Stability RMS Output Noise (% OUT LX8117-05 / 8117A-05 / 8117B-05 (5.0V Fixed) Parameter Symbol Output Voltage Line Regulation (Note 3) Load Regulation (Note 3) Dropout Voltage (Note 4) LX8117-05 LX8117A/B-05 Current Limit LX8117-05 I ...

Page 6

... LX8117-xx/8117A-xx/8117B-xx 0.8, 1 & 1.2A L The LX8117 series ICs are easy to use Low-Dropout (LDO) voltage regulators. They have all of the standard self-protection features expected of a voltage regulator: short circuit protection, safe operating area protection and automatic thermal shutdown if the device temperature rises above approximately 165° ...

Page 7

... Output ripple will be twice as bad as it would be if the ADJ pin were to be bypassed to ground with a properly selected capacitor. OUTPUT VOLTAGE The LX8117 ICs develop a 1.25V reference voltage between the output and the adjust terminal (See Figure 2). By placing a resistor, R1, between these two terminals, a constant current is caused to flow through R1 and down through R2 to set the overall output voltage ...

Page 8

... SOT-223 package soldered at the center of the pad to ambient. Area Substituting the value for R square pad with area: Area SINK will be required to maintain the LX8117 junction temperature within specified limits 5.0V ±5 2.5V ±3% OUT = 0.5A 55° ...

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 ...

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