LIN DOC #: 8117
LX8117-xx/8117A-xx/8117B-xx
0.8, 1 & 1.2A LOW DROPOUT POSITIVE REGULATORS
P R O D U C T I O N D A T A S H E E T
T H E I N F I N I T E P O W E R O F I N N O V A T I O N
DESCRIPTION
KEY FEATURES
■ 0.2% Line Regulation Maximum
The LX8117/8117A/8117B series are
positive Low Dropout (LDO) regulators.
At the designed maximum load current,
theLX8117seriesdropoutvoltageisguar-
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
trimmingoftheinternalvoltagereference
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.
■ 0.4% Load Regulation Maximum
■ Output Current Of 800mA
Most regulator circuit designs include
outputcapacitorswithvaluesintherange
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-useefficiencyandallowingcooler
operation.
The LX8117 is available in low-profile
plastic SOT-223 and D-Pak packages for
applicationswherespaceisatapremium.
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.
■ 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
APPLICATIONS
■ Battery Chargers
■ Active SCSI Terminators
■ 5V To 3.3V Linear Regulators
■ High-Efficiency Linear Regulators
■ Post Regulators For Switching Supplies
AVAILABLE OPTIONS PER PART #
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
Output
Part #
Voltage
PRODUCT HIGHLIGHT
LX8117/8117A/8117B-00 Adjustable
LX8117/8117A/8117B-25
LX8117/8117A/8117B-28
LX8117/8117A/8117B-33
LX8117/8117A/8117B-05
2.5V
2.85V
3.3V
5V
ACTIVE TERMINATOR FOR SCSI-2 BUS
110
110
110
Ω
Ω
Ω
LX8117-28
IN OUT
18 to 27
Lines
GND
4.75V to
5.25V
22µF
10µF
110Ω
PACKAGE ORDER INFORMATION
O/P
Current
Plastic SOT-223
3-pin
Plastic T0-263
DD
3-pin
Plastic T0-252
DT
TA (°C)
ST
(D-Pak) 3-pin
0.8A
1.0A
1.2A
LX8117-xxCST
LX8117A-xxCST
LX8117B-xxCST
LX8117-xxCDD
LX8117-xxCDT
LX8117A-xxCDT
LX8117B-xxCDT
0 to 125
LX8117A-xxCDD
LX8117B-xxCDD
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.
L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
Copyright © 1999
Rev. 1.4 3/99
1
MICROSEMI [ Microsemi ]
