Storage Temperature Range.................. – 65°C to 150°C
Operating Junction Temperature Range (Note 3)
LT1129C-X .......................................... 0°C to 125°C
LT1129C-X Extended Temperature Range
(Note 12) ....................................... –40°C to 125°C
LT1129I-X(Note 12) ......................... –40°C to 125°C
LT1129MP-X(Note 12) ..................... –55°C to 125°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
* For applications requiring input voltage ratings greater than 30V, contact the factory.
PIN CONFIGURATION
TOP VIEW
GND
GND
GND
GND
GND
GND
OUT
SENSE
GND
1
2
3
4
5
6
7
8
9
20 GND
19 GND
18 GND
17 GND
16 GND
15 GND
14 IN
13
SHDN
12 GND
11 GND
TAB
IS
GND
FRONT VIEW
5
4
3
2
1
Q PACKAGE
5-LEAD PLASTIC DD
V
IN
SHDN
GND
SENSE/ADJ*
OUTPUT
OUTPUT 1
SENSE/ 2
ADJ*
GND 3
NC 4
TOP VIEW
8 V
IN
7 GND
6 GND
5
SHDN
S8 PACKAGE
8-LEAD PLASTIC SO
GND 10
F PACKAGE
20-LEAD PLASTIC TSSOP
*PIN 2 = SENSE FOR LT1129-3.3/LT1129-5
= ADJ FOR LT1129
θ
JA
= 30°C/W
*PIN 2 = SENSE FOR LT1129-3.3/LT1129-5
= ADJ FOR LT1129
θ
JA
= 60°C/W
NOTE: ALL GROUND PINS ARE INTERNALLY CONNECTED
θ
JA
= 40°C/W
OBSOLETE PACKAGE
FRONT VIEW
3
TAB
IS
GND
2
1
OUTPUT
GND
V
IN
TAB
IS
GND
FRONT VIEW
5
4
3
2
1
T PACKAGE
5-LEAD PLASTIC TO-220
V
IN
SHDN
GND
SENSE/ADJ*
OUTPUT
ST PACKAGE
3-LEAD PLASTIC SOT-223
θ
JA
= 50°C/W
*PIN 2 = SENSE FOR LT1129-3.3/LT1129-5 = ADJ FOR LT1129
θ
JA
= 50°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT1129CS8#PBF
LT1129IS8#PBF
LT1129CS8-3.3#PBF
LT1129IS8-3.3#PBF
LT1129CS8-5#PBF
TAPE AND REEL
LT1129CS8#TRPBF
LT1129IS8#TRPBF
LT1129CS8-3.3#TRPBF
LT1129IS8-3.3#TRPBF
LT1129CS8-5#TRPBF
PART MARKING*
1129
1129I
11293
1129I3
11295
PACKAGE DESCRIPTION
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
TEMPERATURE RANGE
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
112935ff
2
LT1129/LT1129-3.3/LT1129-5
ORDER INFORMATION
LEAD FREE FINISH
LT1129IS8-5#PBF
LT1129CST-3.3#PBF
LT1129IST-3.3#PBF
LT1129MPST-3.3#PBF
LT1129CST-5#PBF
LT1129IST-5#PBF
LT1129CQ#PBF
LT1129IQ#PBF
LT1129CQ-3.3#PBF
LT1129IQ-3.3#PBF
LT1129CQ-5#PBF
LT1129IQ-5#PBF
LT1129CT#PBF
LT1129IT#PBF
LT1129CT-3.3#PBF
LT1129IT-3.3#PBF
LT1129CT-5#PBF
LT1129IT-5#PBF
LEAD BASED FINISH
LT1129CS8
LT1129IS8
LT1129CS8-3.3
LT1129IS8-3.3
LT1129CS8-5
LT1129IS8-5
LT1129CST-3.3
LT1129IST-3.3
LT1129MPST-3.3
LT1129CST-5
LT1129IST-5
LT1129CQ
LT1129IQ
LT1129CQ-3.3
LT1129IQ-3.3
LT1129CQ-5
LT1129IQ-5
LT1129CT
LT1129IT
LT1129CT-3.3
LT1129IT-3.3
TAPE AND REEL
LT1129IS8-5#TRPBF
LT1129CST-3.3#TRPBF
LT1129IST-3.3#TRPBF
LT1129MPST-3.3#TRPBF
LT1129CST-5#TRPBF
LT1129IST-5#TRPBF
LT1129CQ#TRPBF
LT1129IQ#TRPBF
LT1129CQ-3.3#TRPBF
LT1129IQ-3.3#TRPBF
LT1129CQ-5#TRPBF
LT1129IQ-5#TRPBF
LT1129CT#TRPBF
LT1129IT#TRPBF
LT1129CT-3.3#TRPBF
LT1129IT-3.3#TRPBF
LT1129CT-5#TRPBF
LT1129IT-5#TRPBF
TAPE AND REEL
LT1129CS8#TR
LT1129IS8#TR
LT1129CS8-3.3#TR
LT1129IS8-3.3#TR
LT1129CS8-5#TR
LT1129IS8-5#TR
LT1129CST-3.3#TR
LT1129IST-3.3#TR
LT1129MPST-3.3#TR
LT1129CST-5#TR
LT1129IST-5#TR
LT1129CQ#TR
LT1129IQ#TR
LT1129CQ-3.3#TR
LT1129IQ-3.3#TR
LT1129CQ-5#TR
LT1129IQ-5#TR
LT1129CT#TR
LT1129IT#TR
LT1129CT-3.3#TR
LT1129IT-3.3#TR
PART MARKING*
1129I5
11293
129I3
129MP3
11295
129I5
LT1129CQ
LT1129IQ
LT1129CQ-3.3
LT1129IQ-3.3
LT1129CQ-5
LT1129IQ-5
LT1129CT
LT1129IT
LT1129CT-3.3
LT1129IT-3.3
LT1129CT-5
LT1129IT-5
PART MARKING*
1129
1129I
11293
1129I3
11295
1129I5
11293
129I3
129MP3
11295
129I5
LT1129CQ
LT1129IQ
LT1129CQ-3.3
LT1129IQ-3.3
LT1129CQ-5
LT1129IQ-5
LT1129CT
LT1129IT
LT1129CT-3.3
LT1129IT-3.3
PACKAGE DESCRIPTION
8-Lead Plastic SO
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
5-Lead Plastic DD-PAK
5-Lead Plastic DD-PAK
5-Lead Plastic DD-PAK
5-Lead Plastic DD-PAK
5-Lead Plastic DD-PAK
5-Lead Plastic DD-PAK
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
PACKAGE DESCRIPTION
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
3-Lead Plastic SOT-223
5-Lead Plastic DD-PAK
5-Lead Plastic DD-PAK
5-Lead Plastic DD-PAK
5-Lead Plastic DD-PAK
5-Lead Plastic DD-PAK
5-Lead Plastic DD-PAK
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
5-Lead Plastic TO-220
TEMPERATURE RANGE
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
–55°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
TEMPERATURE RANGE
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
–55°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
0°C to 125°C
–40°C to 125°C
112935ff
3
LT1129/LT1129-3.3/LT1129-5
ORDER INFORMATION
LEAD BASED FINISH
LT1129CT-5
LT1129IT-5
TAPE AND REEL
LT1129CT-5#TR
LT1129IT-5#TR
PART MARKING*
LT1129CT-5
LT1129IT-5
PACKAGE DESCRIPTION
5-Lead Plastic TO-220
5-Lead Plastic TO-220
TEMPERATURE RANGE
0°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
SYMBOL
Regulated Output Voltage
(Notes 4, 12)
CONDITIONS
LT1129-3.3
LT1129-5
LT1129 (Note 5)
Line Regulation (Note 12)
LT1129-3.3
LT1129-5
LT1129 (Note 5)
Load Regulation (Note 12)
LT1129-3.3
LT1129-5
LT1129 (Note 5)
Dropout Voltage
(Note 6)
V
IN
= 3.8V, I
OUT
= 1mA, T
J
= 25°C
4.3V < V
IN
< 20V, 1mA < I
OUT
< 700mA
V
IN
= 5.5V, I
OUT
= 1mA, T
J
= 25°C
6V < V
IN
< 20V, 1mA < I
OUT
< 700mA
V
IN
= 4.3V, I
OUT
= 1mA, T
J
= 25°C
4.8V < V
IN
< 20V, 1mA < I
OUT
< 700mA
ΔV
IN
= 4.8V to 20V, I
OUT
= 1mA
ΔV
IN
= 5.5V to 20V, I
OUT
= 1mA
ΔV
IN
= 4.3V to 20V, I
OUT
= 1mA
ΔI
LOAD
= 1mA to 700mA, T
J
= 25°C
ΔI
LOAD
= 1mA to 700mA
ΔI
LOAD
= 1mA to 700mA, T
J
= 25°C
ΔI
LOAD
= 1mA to 700mA
ΔI
LOAD
= 1mA to 700mA, T
J
= 25°C
ΔI
LOAD
= 1mA to 700mA
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
3.250
3.200
4.925
4.850
3.695
3.640
TYP
3.300
3.300
5.000
5.000
3.750
3.750
1.5
1.5
1.5
6
15
6
20
6
15
0.13
0.25
0.37
0.45
50
310
2.0
10
25
50
150
1.2
0.75
6
15
MAX
3.350
3.400
5.075
5.150
3.805
3.860
10
10
10
20
30
20
30
20
30
0.20
0.25
0.35
0.45
0.45
0.60
0.55
0.70
70
450
3.5
20
45
90
300
2.8
10
25
UNITS
V
V
V
V
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mV
V
V
V
V
V
V
V
V
μA
μA
mA
mA
mA
mA
nA
V
V
μA
μA
112935ff
I
LOAD
= 10mA, T
J
= 25°C
I
LOAD
= 10mA
I
LOAD
= 100mA, T
J
= 25°C
I
LOAD
= 100mA
I
LOAD
= 500mA, T
J
= 25°C
I
LOAD
= 500mA
I
LOAD
= 700mA, T
J
= 25°C
I
LOAD
= 700mA
Ground Pin Current
(Note 7)
I
LOAD
= 0mA
I
LOAD
= 10mA
I
LOAD
= 100mA
I
LOAD
= 300mA
I
LOAD
= 500mA
I
LOAD
= 700mA
Adjust Pin Bias Current (Notes 5, 8)
Shutdown Threshold
Shutdown Pin Current (Note 9)
Quiescent Current in Shutdown
(Note 10)
T
J
= 25°C
V
OUT
= Off to On
V
OUT
= On to Off
V
SHDN
= 0V
V
IN
= 6V, V
SHDN
= 0V
l
l
l
l
0.25
4
LT1129/LT1129-3.3/LT1129-5
ELECTRICAL CHARACTERISTICS
SYMBOL
Ripple Rejection
Current Limit
Input Reverse Leakage Current
Reverse Output Current (Note 11)
CONDITIONS
V
IN
– V
OUT
= 1V (Avg), V
RIPPLE
= 0.5V
P-P
,
f
RIPPLE
= 120Hz, I
LOAD
= 0.7A, T
J
= 25°C
V
IN
– V
OUT
= 7V, T
J
= 25°C
V
IN
= –20V, V
OUT
= 0V
LT1129-3.3
LT1129-5
LT1129 (Note 5)
V
OUT
= 3.3V, V
IN
= 0V
V
OUT
= 5V, V
IN
= 0V
V
OUT
= 3.8V, V
IN
= 0V
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
MIN
52
TYP
64
1.2
16
16
16
1.6
1.0
25
25
25
MAX
UNITS
dB
A
mA
μA
μA
μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The shutdown pin input voltage rating is required for a low
impedance source. Internal protection devices connected to the shutdown
pin will turn on and clamp the pin to approximately 7V or – 0.6V. This
range allows the use of 5V logic devices to drive the pin directly. For high
impedance sources or logic running on supply voltages greater than 5.5V,
the maximum current driven into the shutdown pin must be limited to less
than 20mA.
Note 3:
For junction temperatures greater than 110°C, a minimum load
of 1mA is recommended. For T
J
> 110°C and I
OUT
< 1mA, output voltage
may increase by 1%.
Note 4:
Operating conditions are limited by maximum junction
temperature. The regulated output voltage specification will not apply
for all possible combinations of input voltage and output current. When
operating at maximum input voltage, the output current range must be
limited. When operating at maximum output current, the input voltage
range must be limited.
Note 5:
The LT1129 is tested and specified with the adjust pin connected
to the output pin.
Note 6:
Dropout voltage is the minimum input/output voltage required to
maintain regulation at the specified output current. In dropout the output
voltage will be equal to (V
IN
– V
DROPOUT
). Dropout voltage is measured
between the input pin and the output pin. External voltage drops between
the output pin and the sense pin will add to the dropout voltage.
Note 7:
Ground pin current is tested with V
IN
= V
OUT
(nominal) and a
current source load. This means that the device is tested while operating in
its dropout region. This is the worst case ground pin current. The ground
pin current will decrease slightly at higher input voltages.
Note 8:
Adjust pin bias current flows into the adjust pin.
Note 9:
Shutdown pin current at V
SHDN
= 0V flows out of the shutdown pin.
Note 10:
Quiescent current in shutdown is equal to the sum total of the
shutdown pin current (6μA) and the ground pin current (9μA).
Note 11:
Reverse output current is tested with the input pin grounded. The
output pin and the sense pin are forced to the rated output voltage. This
current flows into the sense pin and out of the ground pin. For the LT1129
(adjustable version) the sense pin is internally tied to the output pin.
Note 12:
The LT1129 regulators are tested and specified under pulse load
conditions such that T
J
≅
T
A
. The LT1129C regulators are 100% tested at
T
A
= 25°C. For C-grade devices, Regulated Output Voltage, Line Regulation
and Load Regulation performance at –40°C and 125°C is assured by
design, characterization and correlation with statistical process controls.
The LT1129I regulators are guaranteed over the full –40°C to 125°C
operating junction temperature range. The LT1129MP regulators are 100%
tested and guaranteed over the –55°C to 125°C temperature range.
1. Introduction
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