LIN D
O C
#:
8117
LX8117-xx/8117A-xx/8117B-xx
0.8, 1 & 1.2A L
O W
D
R O P O U T
P
O S I T I V E
R
E G U L AT O R S
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T I O N
D
A T A
S
H E E T
DESCRIPTION
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 鹵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 10碌F 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.
K E Y F E AT U R E S
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
A P P L I C AT I O N S
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
A
VA I L A B L E
O
P T I O N S
Part #
PER
P
A RT
#
Output
Voltage
Adjustable
2.5V
2.85V
3.3V
5V
NOTE:
For current data & package dimensions, visit our web site:
http://www.linfinity.com.
PRODUCT HIGHLIGHT
A
CTIVE
T
ERMINATOR FOR
SCSI-2 B
US
110鈩?/div>
110鈩?/div>
LX8117/8117A/8117B-00
LX8117/8117A/8117B-25
LX8117/8117A/8117B-28
LX8117/8117A/8117B-33
LX8117/8117A/8117B-05
LX8117-28
IN
4.75V to
5.25V
GND
10碌F
22碌F
OUT
110鈩?/div>
18 to 27
Lines
110鈩?/div>
PA C K A G E O R D E R I N F O R M AT I O N
T
A
(擄C)
O/P
Current
0.8A
1.0A
1.2A
ST
Plastic SOT-223
3-pin
LX8117-xxCST
LX8117A-xxCST
LX8117B-xxCST
DD
Plastic T0-263
3-pin
LX8117-xxCDD
LX8117A-xxCDD
LX8117B-xxCDD
DT
Plastic T0-252
(D-Pak) 3-pin
LX8117-xxCDT
LX8117A-xxCDT
LX8117B-xxCDT
0 to 125
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 漏 1999
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
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