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.
D E S C R I P T I O N
K E Y F E A T 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
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 10F 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.
P R O D U C T H I G H L I G H T
A
CTIVE
T
ERMINATOR
FOR
SCSI-2 B
US
0.8, 1 & 1.2A L
OW
D
R O P O U T
P
O S I T I V E
R
E G U L AT O R S
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
LX8117-xx/8117A-xx/8117B-xx
LIN D
O C
#: 8117
A P P L I C A T 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
P A C K A G E O R D E R I N F O R M A T I O N
T
A
(C)
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
A
VA I L A B L E
O
P T I O N S
P E R
P
A RT
#
110
110
110
110
22F
GND
OUT
IN
LX8117-28
10F
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
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
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
.
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
O/P
Current
0.8, 1 & 1.2A L
OW
D
R O P O U T
P
O S I T I V E
R
E G U L AT O R S
LX8117-xx/8117A-xx/8117B-xx
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
Copyright 1999
Rev. 1.4 3/99
2
P
R O D U C T I O N
D
A T A
S
H E E T
ABSOLUTE MAXIMUM RATINGS
(Note 1)
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) .......................................................................... 150C
Storage Temperature Range ...................................................................... -65C to 150C
Lead Temperature (Soldering, 10 seconds) ............................................................. 300C
Short-Circuit Protection ....................................................................................... Indefinite
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with
respect to Ground. Currents are positive into, negative out of the specified terminal.
PACKAGE PIN OUTS
3. IN
2. OUT
1. ADJ / GND
ST PACKAGE
(Top View)
3
2
1
DD PACKAGE (D
2
Pak)
(Top View)
THERMAL DATA
TAB IS V
OUT
ST PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB,
JT
15C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
JA
*150C/W
DD PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB,
JT
10C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
JA
*60C/W
DT PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB,
JC
9C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
JA
*80C/W
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
JA
). The
JA
numbers are guidelines for the
thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
*
JA
can be improved with package soldered to 0.5IN
2
copper area over backside ground
plane or internal power plane.
JA
can vary from 20C/W to > 40C/W depending on
mounting technique. (See Application Notes Section: Thermal Considerations)
TAB IS V
OUT
BLOCK DIAGRAM
Thermal
Limit Circuit
Control
Circuit
Bandgap
Circuit
Output
Circuit
Bias
Circuit
V
OUT
V
IN
Current
Limit Circuit
ADJ
3. IN
2. OUT
1. ADJ / GND
DT PACKAGE (D-Pak)
(Top View)
TAB IS V
OUT
IN
OUT
ADJ / GND
0.8, 1 & 1.2A L
OW
D
R O P O U T
P
O S I T I V E
R
E G U L AT O R S
LX8117-xx/8117A-xx/8117B-xx
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
3
Copyright 1999
Rev. 1.4 3/99
P
R O D U C T I O N
D
A T A
S
H E E T
Input Voltage
Operating Voltage
LX8117(A/B)-00 / 8117(A/B)-05
LX8117(A/B)-25 / -28 / -33
Input-Output Differential
LX8117(A/B)-00
Operating Ambient Temperature Range
R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S
(Note 2)
Parameter
Symbol
Units
Recommended Operating Conditions
Min.
Typ.
Max.
15
V
12
V
10
V
0
125
C
Note 2. Range over which the device is functional.
E L E C T R I C A L C H A R A C T E R I S T I C S
(Unless otherwise specified: 0C
T
J
125C, I
MAX
= 0.8A for the LX8117-xx, I
MAX
= 1.0A for the LX8117A-xx, and I
MAX
= 1.2A for the LX8117B-xx.)
Notes: 3. See thermal regulation specification for changes in output voltage due to heating effects. Load regulation and line regulation are measured at a constant junction
temperature by low duty cycle pulse testing.
4. 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.
Parameter
Symbol
Test Conditions
Units
LX8117 / 17A / 17B-00
Min.
Typ.
Max.
Reference Voltage
V
REF
I
OUT
= 10mA, (V
IN
- V
OUT
) = 2V, T
J
= 25C
10mA
I
OUT
I
OUT (MAX)
, 1.4V
(V
IN
- V
OUT
)
10V
Line Regulation (Note 3)
V
REF
(V
IN
) I
OUT
= 10mA, 1.5V
(V
IN
- V
OUT
)
7V
Load Regulation (Note 3)
V
REF
(I
OUT
) (V
IN
- V
OUT
) = 3V, 10mA
I
OUT
I
OUT (MAX)
Dropout Voltage
V
I
OUT
= 100mA
(Note 4)
I
OUT
= 500mA
LX8117-00
I
OUT
= I
OUT (MAX)
LX8117A/B-00
I
OUT
= I
OUT (MAX)
Current Limit
LX8117-00
I
OUT (MAX)
(V
IN
- V
OUT
) = 5V, T
J
= 25C
LX8117A-00
(V
IN
- V
OUT
) = 5V, T
J
= 25C
LX8117B-00
(V
IN
- V
OUT
) = 5V, T
J
= 25C
Minimum Load Current (Note 5)
I
OUT (MIN)
V
IN
10V
Thermal Regulation
V
OUT
(Pwr)
T
A
= 25C, 30ms pulse
Ripple Rejection
f
RIPPLE
=120Hz, (V
IN
- V
OUT
) = 3V, V
RIPPLE
= 1Vp-p
Adjust Pin Current
I
ADJ
Adjust Pin Current Change
I
ADJ
10mA
I
OUT
I
OUT (MAX)
, 1.4V
(V
IN
- V
OUT
)
10V
Temperature Stability
V
OUT
(T)
Long Term Stability
V
OUT
(t) T
A
= 125C, 1000 hours
RMS Output Noise (% of V
OUT
)
V
OUT (RMS)
10Hz
f
10kHz
1.238
1.250
1.262
V
1.225
1.250
1.270
V
0.05
0.2
%
0.15
0.4
%
0.97
1.10
V
1.00
1.15
V
1.05
1.20
V
1.15
1.30
V
800
950
mA
1000
1200
mA
1200
1500
mA
0.5
5
mA
0.08
0.2
%/W
60
75
dB
45
100
A
0.2
5
A
0.5
%
0.3
%
0.003
%
LX8117-00 / 8117A-00 / 8117B-00 (Adjustable)
(Other Voltage Options on following pages.)
0.8, 1 & 1.2A L
OW
D
R O P O U T
P
O S I T I V E
R
E G U L AT O R S
LX8117-xx/8117A-xx/8117B-xx
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
Copyright 1999
Rev. 1.4 3/99
4
P
R O D U C T I O N
D
A T A
S
H E E T
E L E C T R I C A L C H A R A C T E R I S T I C S
(continued)
Parameter
Symbol
Test Conditions
Units
LX8117 / 17A / 17B-25
Min.
Typ.
Max.
Output Voltage
V
OUT
I
OUT
= 10mA, V
IN
= 5V, T
A
= 25C
0mA
I
OUT
I
OUT (MAX)
, 4.75V
V
IN
10V
Line Regulation (Note 3)
V
OUT
(V
IN
) I
OUT
= 0mA, 4.25V
V
IN
10V
Load Regulation (Note 3)
V
OUT
(I
OUT
)
V
IN
= 4.25V, 0mA
I
OUT
I
OUT (MAX)
Dropout Voltage
V
I
OUT
= 100mA
(Note 4)
I
OUT
= 500mA
LX8117-25
I
OUT
= I
OUT (MAX)
LX8117A/B-25
I
OUT
= I
OUT (MAX)
Current Limit
LX8117-25
I
OUT (MAX)
(V
IN
- V
OUT
) = 5V, T
J
= 25C
LX8117A-25
(V
IN
- V
OUT
) = 5V, T
J
= 25C
LX8117B-25
(V
IN
- V
OUT
) = 5V, T
J
= 25C
Quiescent Current
I
Q
V
IN
10V
Thermal Regulation
V
OUT
(Pwr)
T
A
= 25C, 30ms pulse
Ripple Rejection
f
RIPPLE
=120Hz, (V
IN
- V
OUT
) = 3V, V
RIPPLE
= 1Vp-p
Temperature Stability
V
OUT
(T)
Long Term Stability
V
OUT
(t) T
A
= 125C, 1000 hours
RMS Output Noise (% of V
OUT
)
V
OUT (RMS)
10Hz
f
10kHz
2.475
2.500
2.525
V
2.450
2.500
2.550
V
1
6
mV
2
10
mV
0.97
1.10
V
1.00
1.15
V
1.05
1.20
V
1.15
1.30
V
800
950
mA
1000
1200
mA
1200
1500
mA
4.5
10
mA
0.08
0.2
%/W
60
75
dB
0.5
%
0.3
%
0.003
%
LX8117-25 / 8117A-25 / 8117B-25 (2.5V Fixed)
Parameter
Symbol
Test Conditions
Units
LX8117 / 17A / 17B-28
Min.
Typ.
Max.
Output Voltage
V
OUT
I
OUT
= 10mA, V
IN
= 4.85V, T
A
= 25C
0mA
I
OUT
I
OUT (MAX)
, 4.25V
V
IN
10V
0mA
I
OUT
500mA, V
IN
= 3.95V
Line Regulation (Note 3)
V
OUT
(V
IN
) I
OUT
= 0mA, 4.25V
V
IN
10V
Load Regulation (Note 3)
V
OUT
(I
OUT
)
V
IN
= 4.25V, 0mA
I
OUT
I
OUT (MAX)
Dropout Voltage
V
I
OUT
= 100mA
(Note 4)
I
OUT
= 500mA
LX8117-28
I
OUT
= I
OUT (MAX)
LX8117A/B-28
I
OUT
= I
OUT (MAX)
Current Limit
LX8117-28
I
OUT (MAX)
(V
IN
- V
OUT
) = 5V, T
J
= 25C
LX8117A-28
(V
IN
- V
OUT
) = 5V, T
J
= 25C
LX8117B-28
(V
IN
- V
OUT
) = 5V, T
J
= 25C
Quiescent Current
I
Q
V
IN
10V
Thermal Regulation
V
OUT
(Pwr)
T
A
= 25C, 30ms pulse
Ripple Rejection
f
RIPPLE
=120Hz, (V
IN
- V
OUT
) = 3V, V
RIPPLE
= 1Vp-p
Temperature Stability
V
OUT
(T)
Long Term Stability
V
OUT
(t) T
A
= 125C, 1000 hours
RMS Output Noise (% of V
OUT
)
V
OUT (RMS)
10Hz
f
10kHz
2.820
2.850
2.880
V
2.790
2.850
2.910
V
2.790
2.850
2.910
V
1
6
mV
2
10
mV
0.97
1.10
V
1.00
1.15
V
1.05
1.20
V
1.15
1.30
V
800
950
mA
1000
1200
mA
1200
1500
mA
4.5
10
mA
0.08
0.2
%/W
60
75
dB
0.5
%
0.3
%
0.003
%
LX8117-28 / 8117A-28 / 8117B-28 (2.8V Fixed)
Notes: 3. See thermal regulation specification for changes in output voltage due to heating effects. Load regulation and line regulation are measured at a constant junction
temperature by low duty cycle pulse testing.
4. 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.
0.8, 1 & 1.2A L
OW
D
R O P O U T
P
O S I T I V E
R
E G U L AT O R S
LX8117-xx/8117A-xx/8117B-xx
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
5
Copyright 1999
Rev. 1.4 3/99
P
R O D U C T I O N
D
A T A
S
H E E T
E L E C T R I C A L C H A R A C T E R I S T I C S
(continued)
Parameter
Symbol
Test Conditions
Units
LX8117 / 17A / 17B-33
Min.
Typ.
Max.
Output Voltage
V
OUT
I
OUT
= 10mA, V
IN
= 5V, T
A
= 25C
0mA
I
OUT
I
OUT (MAX)
, 4.75V
V
IN
10V
Line Regulation (Note 3)
V
OUT
(V
IN
) I
OUT
= 0mA, 4.25V
V
IN
10V
Load Regulation (Note 3)
V
OUT
(I
OUT
)
V
IN
= 4.25V, 0mA
I
OUT
I
OUT (MAX)
Dropout Voltage
V
I
OUT
= 100mA
(Note 4)
I
OUT
= 500mA
LX8117-33
I
OUT
= I
OUT (MAX)
LX8117A/B-33
I
OUT
= I
OUT (MAX)
Current Limit
LX8117-33
I
OUT (MAX)
(V
IN
- V
OUT
) = 5V, T
J
= 25C
LX8117A-33
(V
IN
- V
OUT
) = 5V, T
J
= 25C
LX8117B-33
(V
IN
- V
OUT
) = 5V, T
J
= 25C
Quiescent Current
I
Q
V
IN
10V
Thermal Regulation
V
OUT
(Pwr)
T
A
= 25C, 30ms pulse
Ripple Rejection
f
RIPPLE
=120Hz, (V
IN
- V
OUT
) = 3V, V
RIPPLE
= 1Vp-p
Temperature Stability
V
OUT
(T)
Long Term Stability
V
OUT
(t) T
A
= 125C, 1000 hours
RMS Output Noise (% of V
OUT
)
V
OUT (RMS)
10Hz
f
10kHz
3.267
3.300
3.333
V
3.235
3.300
3.365
V
1
6
mV
2
10
mV
0.97
1.10
V
1.00
1.15
V
1.05
1.20
V
1.15
1.30
V
800
950
mA
1000
1200
mA
1200
1500
mA
4.5
10
mA
0.08
0.2
%/W
60
75
dB
0.5
%
0.3
%
0.003
%
LX8117-33 / 8117A-33 / 8117B-33 (3.3V Fixed)
Parameter
Symbol
Test Conditions
Units
LX8117 / 17A / 17B-05
Min.
Typ.
Max.
Output Voltage
V
OUT
I
OUT
= 10mA, V
IN
= 7V, T
A
= 25C
0mA
I
OUT
I
OUT (MAX)
, 6.50V
V
IN
10V
Line Regulation (Note 3)
V
OUT
(V
IN
) I
OUT
= 0mA, 6.5V
V
IN
10V
Load Regulation (Note 3)
V
OUT
(I
OUT
)
V
IN
= 6.5V, 0mA
I
OUT
I
OUT (MAX)
Dropout Voltage
V
I
OUT
= 100mA
(Note 4)
I
OUT
= 500mA
LX8117-05
I
OUT
= I
OUT (MAX)
LX8117A/B-05
I
OUT
= I
OUT (MAX)
Current Limit
LX8117-05
I
OUT (MAX)
(V
IN
- V
OUT
) = 5V, T
J
= 25C
LX8117A-05
(V
IN
- V
OUT
) = 5V, T
J
= 25C
LX8117B-05
(V
IN
- V
OUT
) = 5V, T
J
= 25C
Quiescent Current
I
Q
V
IN
10V
Thermal Regulation
V
OUT
(Pwr)
T
A
= 25C, 30ms pulse
Ripple Rejection
f
RIPPLE
=120Hz, (V
IN
- V
OUT
) = 3V, V
RIPPLE
= 1Vp-p
Temperature Stability
V
OUT
(T)
Long Term Stability
V
OUT
(t) T
A
= 125C, 1000 hours
RMS Output Noise (% of V
OUT
)
V
OUT (RMS)
10Hz
f
10kHz
4.950
5.000
5.050
V
4.900
5.000
5.100
V
1
10
mV
2.5
15
mV
0.97
1.10
V
1.00
1.15
V
1.05
1.20
V
1.15
1.30
V
800
950
mA
1000
1200
mA
1200
1500
mA
4.5
10
mA
0.08
0.2
%/W
60
75
dB
0.5
%
0.3
%
0.003
%
LX8117-05 / 8117A-05 / 8117B-05 (5.0V Fixed)
Notes: 3. See thermal regulation specification for changes in output voltage due to heating effects. Load regulation and line regulation are measured at a constant junction
temperature by low duty cycle pulse testing.
4. 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.
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