LT1084_15 [Linear]
3A, 5A, 7.5A Low Dropout Positive Fixed Regulators;
| 型号： | LT1084_15 |
| 厂家： | 
Linear |
| 描述： | 3A, 5A, 7.5A Low Dropout Positive Fixed Regulators |
| 文件： | 总22页 (文件大小：291K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1083/LT1084/LT1085
7.5A, 5A, 3A Low Dropout
Positive Adjustable Regulators
FeaTures
DescripTion
The LT®1083 series of positive adjustable regulators are
designedtoprovide7.5A, 5Aand3Awithhigherefficiency
than currently available devices. All internal circuitry is
n
3-Terminal Adjustable
n
Output Current of 3A, 5A or 7.5A
n
Operates Down to 1V Dropout
Guaranteed Dropout Voltage at Multiple Current Levels
Line Regulation: 0.015%
n
designedtooperatedownto1Vinput-to-outputdifferential
and the dropout voltage is fully specified as a function of
load current. Dropout is guaranteed at a maximum of 1.5V
at maximum output current, decreasing at lower load cur-
rents. On-chip trimming adjusts the reference voltage to
1%. Current limit is also trimmed, minimizing the stress
on both the regulator and power source circuitry under
overload conditions.
n
n
n
n
n
Load Regulation: 0.1%
100% Thermal Limit Functional Test
Fixed Versions Available
Available in 3-Lead Plastic TO-220 and DD Packages
applicaTions
The LT1083/LT1084/LT1085 devices are pin compatible
with older 3-terminal regulators. A 10µF output capacitor
isrequiredonthesenewdevices.However,thisisincluded
in most regulator designs.
n
High Efficiency Linear Regulators
n
Post Regulators for Switching Supplies
n
Constant Current Regulators
Battery Chargers
n
Unlike PNP regulators, where up to 10% of the output cur-
rent is wasted as quiescent current, the LT1083 quiescent
current flows into the load, increasing efficiency.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
UltraFast and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
DEVICE
OUTPUT CURRENT*
LT1083
LT1084
LT1085
7.5A
5.0A
3.0A
*For a 1.5A low dropout regulator see the LT1086 data sheet.
Typical applicaTion
Dropout Voltage vs Output Current
2
5V, 7.5A Regulator
LT1083
ADJ
5V AT 7.5A
OUT
V
≥ 6.5V
IN
IN
121Ω
1%
+
1
0
+
10µF
10µF*
TANTALUM
365Ω
1%
*REQUIRED FOR STABILITY
1083/4/5 ADJ TA01
0
I
FULL LOAD
OUTPUT CURRENT
1083/4/5 ADJ TA02
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LT1083/LT1084/LT1085
(Note 1)
absoluTe MaxiMuM raTings
Power Dissipation............................... Internally Limited
Input-to-Output Voltage Differential
M-Grades: (OBSOLETE)
Control Section...............– 55°C to 150°C
C-Grades...............................................................30V
I-Grades................................................................30V
M-Grades (OBSOLETE) ........................................35V
Operating Junction Temperature Range (Note 9)
C-Grades: Control Section................... 0°C to 125°C
Power Transistor................. 0°C to 150°C
Power Transistor.............–55°C to 200°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)...................300°C
preconDiTioning
100% thermal shutdown functional test.
I-Grades: Control Section...............– 40°C to 125°C
Power Transistor.............– 40°C to 150°C
pin conFiguraTion
TAB IS
FRONT VIEW
OUTPUT
FRONT VIEW
3
2
1
V
V
IN
3
2
1
V
V
IN
TAB
IS
OUTPUT
OUT
OUT
ADJ
ADJ
P PACKAGE
T PACKAGE
3-LEAD PLASTIC TO-3P
3-LEAD PLASTIC TO-220
θ
= 35°C/W
JA
θ
= 50°C/W
JA
OBSOLETE PACKAGE
BOTTOM VIEW
FRONT VIEW
CASE IS
OUTPUT
V
IN
3
2
1
V
V
IN
TAB
IS
OUTPUT
2
1
OUT
ADJ
M PACKAGE
3-LEAD PLASTIC DD
ADJ
K PACKAGE
θ
= 30°C/W*
JA
2-LEAD TO-3 METAL CAN
2
*WITH PACKAGE SOLDERED TO 0.5IN COPPER AREA OVER
θ
= 35°C/W
BACKSIDE GROUND PLANE OR INTERNAL POWER PLANE. θ CAN VARY
JA
JA
FROM 20°C/W TO >40°C/W DEPENDING ON MOUNTING TECHNIQUE
OBSOLETE PACKAGE
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For more information www.linear.com/LT1083
LT1083/LT1084/LT1085
orDer inForMaTion
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT1083CP#PBF
NA
LT1083CP
3-Lead Plastic TO-3P
Control: 0°C to 125°C
Power: 0°C to 150°C
LT1084CP#PBF
NA
LT1084CP
3-Lead Plastic TO-3P
Control: 0°C to 125°C
Power: 0°C to 150°C
OBSOLETE PACKAGE
LT1084CT#PBF
LT1084IT#PBF
LT1085CT#PBF
LT1085IT#PBF
LT1085CM#PBF
LT1085IM#PBF
NA
LT1084CT
LT1084IT
LT1085CT
LT1085IT
LT1085CM
LT1085IM
3-Lead Plastic TO-220
3-Lead Plastic TO-220
3-Lead Plastic TO-220
3-Lead Plastic TO-220
3-Lead Plastic DD
Control: 0°C to 125°C
Power: 0°C to 150°C
NA
Control: –40°C to 125°C
Power: –40°C to 150°C
NA
Control: 0°C to 125°C
Power: 0°C to 150°C
NA
Control: –40°C to 125°C
Power: –40°C to 150°C
LT1085CM#TRPBF
LT1085IM#TRPBF
Control: 0°C to 125°C
Power: 0°C to 150°C
3-Lead Plastic DD
Control: –40°C to 125°C
Power: –40°C to 150°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT1083CP
NA
LT1083CP
3-Lead Plastic TO-3P
Control: 0°C to 125°C
Power: 0°C to 150°C
LT1084CP
NA
LT1084CP
3-Lead Plastic TO-3P
Control: 0°C to 125°C
Power: 0°C to 150°C
OBSOLETE PACKAGE
LT1084CT
LT1084IT
LT1085CT
LT1085IT
LT1085CM
LT1085IM
NA
LT1084CT
LT1084IT
LT1085CT
LT1085IT
LT1085CM
LT1085IM
3-Lead Plastic TO-220
3-Lead Plastic TO-220
3-Lead Plastic TO-220
3-Lead Plastic TO-220
3-Lead Plastic DD
Control: 0°C to 125°C
Power: 0°C to 150°C
NA
Control: –40°C to 125°C
Power: –40°C to 150°C
NA
Control: 0°C to 125°C
Power: 0°C to 150°C
NA
Control: –40°C to 125°C
Power: –40°C to 150°C
LT1085CM#TR
LT1085IM#TR
Control: 0°C to 125°C
Power: 0°C to 150°C
3-Lead Plastic DD
Control: –40°C to 125°C
Power: –40°C to 150°C
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For more information www.linear.com/LT1083
LT1083/LT1084/LT1085
orDer inForMaTion
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT1083CK
NA
LT1083CK
2-Lead TO-3 Metal Can
Control: 0°C to 125°C
Power: 0°C to 150°C
LT1083MK
LT1084CK
LT1084MK
LT1085CK
LT1085MK
NA
NA
NA
NA
NA
LT1083MK
LT1084CK
LT1084MK
LT1085CK
LT1085MK
2-Lead TO-3 Metal Can
2-Lead TO-3 Metal Can
2-Lead TO-3 Metal Can
2-Lead TO-3 Metal Can
2-Lead TO-3 Metal Can
Control: –55°C to 150°C
Power: –55°C to 200°C
Control: 0°C to 125°C
Power: 0°C to 150°C
Control: –55°C to 150°C
Power: –55°C to 200°C
Control: 0°C to 125°C
Power: 0°C to 150°C
Control: –55°C to 150°C
Power: –55°C to 200°C
OBSOLETE PACKAGE
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
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LT1083/LT1084/LT1085
The l denotes the specifications which apply over the full operating
elecTrical characTerisTics
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
I = 10mA, T = 25°C,
OUT
MIN
TYP
MAX
UNITS
Reference Voltage
J
(V – V ) = 3V
1.238
1.225
1.250
1.250
1.262
1.270
V
V
IN
OUT
10mA ≤ I
≤ I
FULL_LOAD
OUT
l
1.5V ≤ (V – V ) ≤ 25V (Notes 4, 6, 7)
IN
OUT
Line Regulation
I
= 10mA, 1.5V ≤ (V – V ) ≤ 15V, T = 25°C (Notes 2, 3)
0.015
0.035
0.2
0.2
%
%
LOAD
IN
OUT
J
l
l
l
M-Grade: 15V ≤ (V – V ) ≤ 35V (Notes 2, 3)
0.05
0.05
0.5
0.5
%
%
IN
OUT
C-, I-Grades: 15V ≤ (V – V ) ≤ 30V (Notes 2, 3)
IN
OUT
Load Regulation
Dropout Voltage
(V – V ) = 3V, 10mA ≤ I
(Notes 2, 3, 4, 6)
≤ I
, T = 25°C
0.1
0.2
0.3
0.4
%
%
IN
OUT
OUT
FULL_LOAD
J
l
l
∆V = 1%, I
= I (Notes 5, 6, 8)
FULL_LOAD
1.3
1.5
V
REF
OUT
Current Limit
LT1083
l
l
l
l
l
l
(V – V ) = 5V
8.0
0.4
5.5
0.3
3.2
0.2
9.5
1.0
6.5
0.6
4.0
0.5
A
A
A
A
A
A
IN
OUT
(V – V ) = 25V
IN
OUT
LT1084
LT1085
(V – V ) = 5V
IN OUT
(V – V ) = 25V
IN
OUT
(V – V ) = 5V
IN
OUT
(V – V ) = 25V
IN
OUT
l
Minimum Load Current
(V – V ) = 25V
5
10
mA
IN
OUT
Thermal Regulation
LT1083
T = 25°C, 30ms Pulse
A
0.002
0.003
0.004
0.010
0.015
0.020
%/W
%/W
%/W
LT1084
LT1085
l
Ripple Rejection
f = 120Hz, C
= 25µF, C
= 25µF Tantalum
60
75
dB
ADJ
OUT
I
= I
FULL_LOAD
, (V – V ) = 3V (Notes 6, 7, 8)
OUT
IN
OUT
Adjust Pin Current
T = 25°C
55
µA
µA
J
l
l
l
120
5
Adjust Pin Current Change
Temperature Stability
10mA ≤ I
≤ I
, 1.5V ≤ (V – V ) ≤ 25V (Note 6)
0.2
0.5
µA
%
%
%
OUT
FULL_LOAD
IN
OUT
Long-Term Stability
T = 125°C, 1000 Hrs
A
0.3
1
RMS Output Noise (% of V
)
T = 25°C, 10Hz = ≤ f ≤ 10kHz
A
0.003
OUT
Thermal Resistance Junction-to-Case
LT1083
Control Circuitry/Power Transistor
K Package
0.6/1.6
0.5/1.6
0.75/2.3
0.65/2.3
0.65/2.7
0.9/3.0
0.7/3.0
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
P Package
K Package
P Package
T Package
K Package
M, T Package
LT1084
LT1085
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For more information www.linear.com/LT1083
LT1083/LT1084/LT1085
elecTrical characTerisTics
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 4: I
is defined in the current limit curves. The I
FULL_LOAD FULL_LOAD
curve is defined as the minimum value of current limit as a function of
input-to-output voltage. Note that the 60W power dissipation for the
LT1083 (45W for the LT1084 (K, P), 30W for the LT1084 (T), 30W for the
LT1085) is only achievable over a limited range of input-to-output voltage.
Note 5: Dropout voltage is specified over the full output current range of
the device. Test points and limits are shown on the Dropout Voltage curve.
Note 2: See thermal regulation specifications for changes in output voltage
due to heating effects. Load and line regulation are measured at a constant
junction temperature by low duty cycle pulse testing.
Note 3: Line and load regulation are guaranteed up to the maximum power
dissipation (60W for the LT1083, 45W for the LT1084 (K, P), 30W for the
LT1084 (T) and 30W for the LT1085). Power dissipation is determined by
the input/output differential and the output current. Guaranteed maximum
power dissipation will not be available over the full input/output voltage
range.
Note 6: For LT1083 I
is 5A for –55°C ≤ T < – 40°C and 7.5A for
FULL_LOAD J
T ≥ –40°C.
J
Note 7: 1.7V ≤ (V – V ) ≤ 25V for LT1084 at –55°C ≤ T ≤ – 40°C.
IN
OUT
J
Note 8: Dropout is 1.7V maximum for LT1084 at –55°C ≤ T ≤ –40°C.
Note 9: The LT1083/LT1084/LT1085 regulators are tested and specified
under pulse load conditions such that T ≅ T . The C-grade LT1083/
J
J
A
LT1084/LT1085 are 100% tested at 25°C.The I-grade LT1084/LT1085 are
guaranteed over the full –40°C to 125°C operating ambient temperature
range.
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For more information www.linear.com/LT1083
LT1083/LT1084/LT1085
Typical perForMance characTerisTics
LT1083
LT1083
LT1083
Dropout Voltage
Short-Circuit Current
Load Regulation
12
10
8
0.10
2
INDICATES GUARANTEED TEST POINT
∆I = 7.5A
–40°C ≤ T ≤ 150°C
J
25°C
0.05
0
0°C ≤ T ≤ 125°C
J
150°C
–0.05
–0.10
–0.15
–0.20
1
6
T = 150°C
J
–55°C
4
2
0
T = 25°C
J
T = –55°C
J
I
FULL LOAD
GUARANTEED
10
INPUT/OUTPUT DIFFERENTIAL (V)
0
75 100
TEMPERATURE (°C)
–50 –25
0
25 50
125 150
0
1
2
3
4
5
6
7
8
9
10
20
30
35
0
5
15
25
OUTPUT CURRENT (A)
LT1083/4/5 ADJ G03
LT1083/4/5 ADJ G01
LT1083/4/5 ADJ G02
LT1084
Dropout Voltage
LT1084
LT1084
Short-Circuit Current
Load Regulation
10
9
8
7
6
5
4
3
2
1
0
2
1
0
0.10
0.05
INDICATES GUARANTEED TEST POINT
∆I = 5A
–55°C ≤ T ≤ 150°C
J
0°C ≤ T ≤ 125°C
J
150°C
25°C
0
–55°C
–0.05
–0.10
–0.15
–0.20
T = –55°C
J
T = 25°C
J
T = 150°C
J
I
FULL LOAD
GUARANTEED
0
10
15
20
25
30
35
5
75 100
0
1
3
4
5
6
–50 –25
0
25 50
125 150
2
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE (°C)
OUTPUT CURRENT (A)
LT1083/4/5 ADJ G05
LT1083/4/5 ADJ G04
LT1083/4/5 ADJ G06
LT1085
Dropout Voltage
LT1085
LT1085
Short-Circuit Current
Load Regulation
2
1
0
6
5
4
3
0.10
0.05
INDICATES GUARANTEED TEST POINT
∆I = 3A
–55°C ≤ T ≤ 150°C
J
0°C ≤ T ≤ 125°C
J
25°C
0
150°C
–0.05
–0.10
–0.15
–0.20
T = –55°C
J
T = 25°C
J
–55°C
T = 150°C
J
2
1
0
I
FULL LOAD
GUARANTEED
0
2
3
1
4
75 100
–50 –25
0
25 50
125 150
LT1083/4/5 ADJ G09
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20
30
35
0
5
10
15
25
OUTPUT CURRENT (A)
TEMPERATURE (°C)
INPUT/OUTPUT DIFFERENTIAL (V)
LT1083/4/5 ADJ G07
LT1083/4/5 ADJ G08
7
For more information www.linear.com/LT1083
LT1083/LT1084/LT1085
Typical perForMance characTerisTics
Minimum Operating Current
Temperature Stability
Adjust Pin Current
10
9
8
7
6
5
4
3
2
1
0
100
90
80
70
60
50
40
30
20
10
0
1.27
1.26
1.25
1.24
1.23
T = 150°C
J
T = 25°C
J
T = –55°C
J
75 100
–50 –25
0
25 50
125 150
0
10
15
20
25
30
35
–50 –25
0
25 50
75 100
125 150
5
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT/OUTPUT DIFFERENTIAL (V)
LT1083/4/5 ADJ G12
LT1083/4/5 ADJ G10
LT1083/4/5 ADJ G11
LT1083
Ripple Rejection
LT1083
Ripple Rejection vs Current
LT1083
Maximum Power Dissipation*
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
V
≤ 3V
P-P
V
f
= 120Hz
RIPPLE
RIPPLE
RIPPLE
R
V
≤ 0.5V
≤ 3V
P-P
P-P
(V – V ) ≥ 3V
IN
OUT
f
= 20kHz
RIPPLE
R
V
≤ 0.5V
P-P
LT1083MK
(V – V ) ≥ V
IN
OUT
DROPOUT
LT1083CP
LT1083CK
C
C
I
= 200µF AT FREQUENCIES < 60Hz
= 25µF AT FREQUENCIES > 60Hz
= 7A
V
C
C
= 5V
= 25µF
= 25µF
ADJ
ADJ
OUT
OUT
ADJ
OUT
10
100
1k
10k
100k
0
4
6
7
50 60 70 80 90 100 110 120 130 140 150
CASE TEMPERATURE (°C)
1
2
3
5
8
FREQUENCY (Hz)
OUTPUT CURRENT (A)
1083/4/5 ADJ G13
* AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
1083/4/5 ADJ G14
LT1083/4/5 ADJ G15
LT1084
Ripple Rejection
LT1084
Ripple Rejection vs Current
LT1084
Maximum Power Dissipation*
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
60
f
= 120Hz
RIPPLE
V
≤ 3V
V
≤ 0.5V
RIPPLE P-P
R
RIPPLE
P-P
V
≤ 3V
P-P
50
(V – V ) ≥ 3V
IN
OUT
LT1084MK
f
= 20kHz
RIPPLE
R
40
V
≤ 0.5V
P-P
(V – V ) ≥ V
IN
OUT
DROPOUT
30
LT1084CT
LT1084CP
20
C
C
I
= 200µF AT FREQUENCIES < 60Hz
= 25µF AT FREQUENCIES > 60Hz
= 5A
V
C
C
= 5V
= 25µF
= 25µF
ADJ
ADJ
OUT
OUT
ADJ
OUT
10
0
LT1084CK
50 60 70 80 90 100 110 120 130 140 150
CASE TEMPERATURE (°C)
10
100
1k
10k
100k
0
4
1
2
3
5
FREQUENCY (Hz)
OUTPUT CURRENT (A)
* AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
1083/4/5 ADJ G16
1083/4/5 ADJ G17
LT1083/4/5 ADJ G18
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LT1083/LT1084/LT1085
Typical perForMance characTerisTics
LT1085
LT1085
LT1085
Ripple Rejection
Ripple Rejection vs Current
Maximum Power Dissipation*
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
50
V
≤ 3V
P-P
V
RIPPLE
RIPPLE
≤ 0.5V
P-P
40
f
= 120Hz
RIPPLE
R
(V – V ) ≥ 3V
IN
OUT
V
≤ 3V
P-P
LT1085MK
30
(V – V ) ≥ V
IN DROPOUT
f
= 20kHz
RIPPLE
OUT
R
V
≤ 0.5V
P-P
20
LT1085CT
C
C
I
= 200µF AT FREQUENCIES < 60Hz
= 25µF AT FREQUENCIES > 60Hz
= 3A
V
= 5V
= 25µF
= 25µF
10
ADJ
ADJ
OUT
OUT
ADJ
OUT
C
LT1085CK
C
0
10
100
1k
10k
100k
50 60 70 80 90 100 110 120 130 140 150
0
2.5
0.5
1.0
1.5
2.0
3.0
FREQUENCY (Hz)
CASE TEMPERATURE (°C)
OUTPUT CURRENT (A)
1083/4/5 ADJ G19
* AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
1083/4/5 ADJ G20
LT1083/4/5 ADJ G21
LT1084
Load Transient Response
LT1083
Load Transient Response
LT1085
Load Transient Response
0.6
0.4
0.2
0
0.6
0.4
0.2
0
0.3
0.2
0.1
0
C
= 0
C
= 0
ADJ
ADJ
C
ADJ
= 0
C
= 1µF
C
= 1µF
C
= 1µF
ADJ
ADJ
ADJ
–0.2
–0.4
8
–0.2
–0.4
–0.6
6
–0.1
–0.2
–0.3
3
C
C
= 1µF
OUT
IN
C
C
= 1µF
OUT
= 10µF TANTALUM
IN
C
C
= 1µF
OUT
IN
= 10µF TANTALUM
= 10µF TANTALUM
V
V
=10V
OUT
IN
6
=13V
PRELOAD=100mA
V
=10V
OUT
V
V
=10V
4
4
OUT
IN
2
V
=13V
IN
=13V
2
2
1
PRELOAD=100mA
PRELOAD=100mA
0
0
0
0
50
TIME (µs)
0
50
TIME (µs)
100
100
0
50
TIME (µs)
100
1083/4/5 ADJ G22
1083/4/5 ADJ G23
1083/4/5 ADJ G24
LT1083
Line Transient Response
LT1084
Line Transient Response
LT1085
Line Transient Response
150
100
50
60
40
60
40
C
ADJ
= 0
C
= 0
C
ADJ
= 0
ADJ
C
ADJ
= 1µF
C
ADJ
= 1µF
C
= 1µF
ADJ
20
20
0
0
0
–50
–100
–150
14
–20
–40
–60
14
–20
–40
–60
14
V
I
= 10V
V
I
C
C
= 10V
V
I
= 10V
OUT
IN
OUT
IN
IN
OUT
OUT
IN
= 0.2A
= 0.2A
= 0.2A
C
C
= 1µF TANTALUM
= 10µF TANTALUM
= 1µF TANTALUM
= 10µF TANTALUM
C
C
= 1µF TANTALUM
= 10µF TANTALUM
IN
OUT
IN
OUT
13
13
13
12
12
12
0
100
TIME (µs)
0
100
TIME (µs)
200
200
0
100
TIME (µs)
200
1083/4/5 ADJ G25
1083/4/5 ADJ G27
1083/4/5 ADJ G26
108345fh
9
For more information www.linear.com/LT1083
LT1083/LT1084/LT1085
block DiagraM
V
IN
+
–
THERMAL
LIMIT
V
OUT
1083/4/5 ADJ BD
V
ADJ
applicaTions inForMaTion
The LT1083 family of 3-terminal adjustable regulators is
easy to use and has all the protection features that are
expectedinhighperformancevoltageregulators.Theyare
short-circuit protected, and have safe area protection as
well as thermal shutdown to turn off the regulator should
the junction temperature exceed about 165°C.
on the output will ensure stability. Normally, capacitors
muchsmallerthanthiscanbeusedwiththeLT1083.Many
different types of capacitors with widely varying charac-
teristics are available. These capacitors differ in capacitor
tolerance (sometimes ranging up to 100%), equivalent
seriesresistance,andcapacitancetemperaturecoefficient.
The 150µF or 22µF values given will ensure stability.
These regulators are pin compatible with older 3-terminal
adjustable devices, offer lower dropout voltage and more
precisereferencetolerance.Further,thereferencestability
with temperature is improved over older types of regula-
tors. The only circuit difference between using the LT1083
family and older regulators is that this new family requires
an output capacitor for stability.
When the adjustment terminal is bypassed to improve the
ripple rejection, the requirement for an output capacitor
increases. The value of 22µF tantalum or 150µF aluminum
covers all cases of bypassing the adjustment terminal.
Without bypassing the adjustment terminal, smaller
capacitors can be used with equally good results and the
table below shows approximately what size capacitors are
needed to ensure stability.
Stability
The circuit design used in the LT1083 family requires the
use of an output capacitor as part of the device frequency
compensation.Foralloperatingconditions,theadditionof
a 150µF aluminium electrolytic or a 22µF solid tantalum
Recommended Capacitor Values
INPUT
OUTPUT
ADJUSTMENT
10µF
10µF
10µF Tantalum, 50µF Aluminum
22µF Tantalum, 150µF Aluminum
None
20µF
108345fh
10
For more information www.linear.com/LT1083
LT1083/LT1084/LT1085
applicaTions inForMaTion
Normally, capacitor values on the order of 100µF are used
in the output of many regulators to ensure good transient
responsewithheavyloadcurrentchanges. Outputcapaci-
tance can be increased without limit and larger values of
output capacitor further improve stability and transient
response of the LT1083 regulators.
pininstantaneouslyshortedtoground,candamageoccur.
A crowbar circuit at the input of the LT1083 can generate
thosekindsofcurrents, andadiodefromoutputtoinputis
then recommended. Normal power supply cycling or even
plugging and unplugging in the system will not generate
current large enough to do any damage.
Anotherpossiblestabilityproblemthatcanoccurinmono-
lithic IC regulators is current limit oscillations. These can
occur because, in current limit, the safe area protection
exhibits a negative impedance. The safe area protection
decreases the current limit as the input-to-output volt-
age increases. That is the equivalent of having a negative
resistance since increasing voltage causes current to
decrease. Negative resistance during current limit is not
unique to the LT1083 series and has been present on all
power IC regulators. The value of the negative resistance
is a function of how fast the current limit is folded back
as input-to-output voltage increases. This negative resis-
tance can react with capacitors or inductors on the input
to cause oscillation during current limiting. Depending
on the value of series resistance, the overall circuitry may
end up unstable. Since this is a system problem, it is not
necessarily easy to solve; however, it does not cause any
problemswiththeICregulatorandcanusuallybeignored.
The adjustment pin can be driven on a transient basis
25V, with respect to the output without any device deg-
radation. Of course, as with any IC regulator, exceeding
the maximum input to output voltage differential causes
the internal transistors to break down and none of the
protection circuitry is functional.
D1
1N4002
(OPTIONAL)
IN
OUT
LT1083
ADJ
V
V
OUT
IN
+
C
OUT
150µF
R1
R2
+
C
ADJ
10µF
1083/4/5 ADJ F00
Overload Recovery
Like any of the IC power regulators, the LT1083 has safe
area protection. The safe area protection decreases the
current limit as input-to-output voltage increases and
keeps the power transistor inside a safe operating region
for all values of input-to-output voltage. The LT1083
protection is designed to provide some output current
at all values of input-to-output voltage up to the device
breakdown.
Protection Diodes
In normal operation, the LT1083 family does not need
any protection diodes. Older adjustable regulators re-
quired protection diodes between the adjustment pin and
the output and from the output to the input to prevent
overstressing the die. The internal current paths on the
LT1083 adjustment pin are limited by internal resistors.
Therefore, even with capacitors on the adjustment pin, no
protection diode is needed to ensure device safety under
short-circuit conditions.
When power is first turned on, as the input voltage rises,
the output follows the input, allowing the regulator to start
up into very heavy loads. During the start-up, as the input
voltage is rising, the input-to-output voltage differential
remains small, allowing the regulator to supply large
output currents. With high input voltage, a problem can
occur wherein removal of an output short will not allow
the output voltage to recover. Older regulators, such as
the 7800 series, also exhibited this phenomenon, so it is
not unique to the LT1083.
Diodes between input and output are usually not needed.
The internal diode between the input and the output pins
of the LT1083 family can handle microsecond surge cur-
rentsof50Ato100A. Evenwithlargeoutputcapacitances,
it is very difficult to get those values of surge currents
in normal operations. Only with a high value of output
capacitors, such as 1000µF to 5000µF and with the input
108345fh
11
For more information www.linear.com/LT1083
LT1083/LT1084/LT1085
applicaTions inForMaTion
The problem occurs with a heavy output load when the
input voltage is high and the output voltage is low, such
as immediately after removal of a short. The load line for
such a load may intersect the output current curve at two
points. If this happens, there are two stable output operat-
ing points for the regulator. With this double intersection,
the power supply may need to be cycled down to zero and
brought up again to make the output recover.
IN
OUT
LT1083
ADJ
V
OUT
V
IN
V
R1
R2
REF
I
ADJ
50µA
R2
R1
V
= V
1 +
+ I
R2
ADJ
OUT
REF
1083/4/5 ADJ F01
Figure 1. Basic Adjustable Regulator
Ripple Rejection
Load Regulation
The typical curves for ripple rejection reflect values for a
bypassed adjustment pin. This curve will be true for all
values of output voltage. For proper bypassing and ripple
rejection approaching the values shown, the impedance
of the adjust pin capacitor at the ripple frequency should
be less than the value of R1, (normally 100Ω to 120Ω).
The size of the required adjust pin capacitor is a function
of the input ripple frequency. At 120Hz the adjust pin
capacitor should be 25µF if R1 = 100Ω. At 10kHz only
0.22µF is needed.
Because the LT1083 is a 3-terminal device, it is not pos-
sible to provide true remote load sensing. Load regulation
will be limited by the resistance of the wire connecting
the regulator to the load. The data sheet specification for
load regulation is measured at the bottom of the package.
Negative side sensing is a true Kelvin connection, with the
bottom of the output divider returned to the negative side
of the load. Although it may not be immediately obvious,
best load regulation is obtained when the top of the resis-
tor divider R1 is connected directly to the case not to the
load. This is illustrated in Figure 2. If R1 were connected
to the load, the effective resistance between the regulator
and the load would be:
For circuits without an adjust pin bypass capacitor, the
ripple rejection will be a function of output voltage. The
output ripple will increase directly as a ratio of the output
voltageto thereferencevoltage(V /V ). Forexample,
OUT REF
⎛
⎜
⎝
⎞
R2+R1
withtheoutputvoltageequalto5Vandnoadjustpincapaci-
tor, theoutputripplewillbehigherbytheratioof5V/1.25V
or four times larger. Ripple rejection will be degraded by
12dB from the value shown on the typical curve.
R •
,R =Parasitic Line Resistance
P
⎟
P
⎠
R1
R
P
PARASITIC
LINE RESISTANCE
Output Voltage
V
IN
IN
LT1083 OUT
ADJ
The LT1083 develops a 1.25V reference voltage between
the output and the adjust terminal (see Figure 1). 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. Normally this
current is the specified minimum load current of 10mA.
R1*
R2*
R
L
*CONNECT R1 TO CASE
CONNECT R2 TO LOAD
1083/4/5 ADJ F02
Because I
is very small and constant when compared
ADJ
with the current through R1, it represents a small error
and can usually be ignored.
Figure 2. Connections for Best Load Regulation
108345fh
12
For more information www.linear.com/LT1083
LT1083/LT1084/LT1085
applicaTions inForMaTion
Connected as shown, R is not multiplied by the divider
compound at the case-to-heat sink interface is strongly
recommended. If the case of the device must be electri-
cally isolated, a thermally conductive spacer can be used,
as long as its added contribution to thermal resistance is
considered. Note that the case of all devices in this series
is electrically connected to the output.
P
ratio.R isabout0.004Ωperfootusing16-gaugewire.This
P
translates to 4mV/ft at 1A load current, so it is important
to keep the positive lead between regulator and load as
short as possible and use large wire or PC board traces.
Thermal Considerations
For example, using an LT1083CK (TO-3, Commercial)
and assuming:
The LT1083 series of regulators have internal power and
thermal limiting circuitry designed to protect the device
under overload conditions. For continuous normal load
conditions however, maximum junction temperature rat-
ings must not be exceeded. It is important to give careful
consideration to all sources of thermal resistance from
junction to ambient. This includes junction-to-case, case-
to-heat sink interface, and heat sink resistance itself. New
thermal resistance specifications have been developed to
more accurately reflect device temperature and ensure
safe operating temperatures. The data section for these
newregulatorsprovidesaseparatethermalresistanceand
maximumjunctiontemperatureforboththeControlSection
andthePowerTransistor.Previousregulators,withasingle
junction-to-case thermal resistance specification, used
an average of the two values provided here and therefore
couldallowexcessivejunctiontemperaturesundercertain
conditionsofambienttemperatureandheatsinkresistance.
To avoid this possibility, calculations should be made for
both sections to ensure that both thermal limits are met.
V (Max Continuous) = 9V, V
= 5V, I
= 6A,
OUT
IN
OUT
T = 75°C, θ
= 1°C/W,
A
HEAT SINK
θ
= 0.2°C/W for K package with
CASE-TO-HEAT SINK
thermal compound.
Power dissipation under these conditions is equal to:
P = (V – V )(I ) = 24W
D
IN
OUT OUT
Junction temperature will be equal to:
T = T + P (θ + θ
+ θ )
J
A
D
HEAT SINK
CASE-TO-HEAT SINK
JC
For the Control Section:
T = 75°C + 24W (1°C/W + 0.2°C/W + 0.6°C/W) = 118°C
J
118°C < 125°C = T
Commercial Range)
(Control Section
JMAX
For the Power Transistor:
T = 75°C + 24W (1°C/W + 0.2°C/W + 1.6°C/W) = 142°C
J
142°C < 150°C = T
Commercial Range)
(Power Transistor
JMAX
Junction-to-case thermal resistance is specified from the
IC junction to the bottom of the case directly below the
die. Thisis thelowestresistancepath forheatflow. Proper
mounting is required to ensure the best possible thermal
flowfromthisareaofthepackagetotheheatsink.Thermal
In both cases the junction temperature is below the maxi-
mum rating for the respective sections, ensuring reliable
operation.
108345fh
13
For more information www.linear.com/LT1083
LT1083/LT1084/LT1085
Typical applicaTion
7.5A Variable Regulator
T1
L
1mH
TRIAD
C30B
F-269U
0V TO 35V
OA TO 7.5A
IN
LT1083 OUT
ADJ
+
20Ω
T2
750Ω* 1.5k
100µF
3
+
C1
50,000µF
110VAC
1N4003
LT1004-1.2
1N914
20Ω
2
1
C30B
1N4003
2k
1N4003
OUTPUT
ADJUST
16k*
11k*
1µF
560Ω
15k
15V
LT1004-1.2
2.7k
82k
10k
16k*
–15V
4
8
200k
2
+
–
7
–15V
LT1011
3
0.1µF
1
1N4148
NC
100pF
15V
2N3904
8
–15V
4
3
1
–
+
7
3
2
8
LT1011
+
10k
6
2
LM301A
1% FILM RESISTOR
L: DALE TO-5 TYPE
*
1
–
7
15V
15K
15V
T2: STANCOR 11Z-2003
4
–15V
11k*
GENERAL PURPOSE REGULATOR WITH SCR PREREGULATOR
TO LOWER POWER DISSIPATION. ABOUT 1.7V DIFFERENTIAL
IS MAINTAINED ACROSS THE LT1083 INDEPENDENT OF OUTPUT
VOLTAGE AND LOAD CURRENT
LT1083/4/5 ADJ TA05
1µF
108345fh
14
LT1083/LT1084/LT1085
Typical applicaTion
Paralleling Regulators
2 FEET #18 WIRE*
V
IN
IN
IN
LT1083 OUT
ADJ
R2
R1
V
= 1.25V 1 +
(
OUT
)
I
= 0A TO 15A
OUT
0.015Ω
LT1083 OUT
ADJ
*THE #18 WIRE ACTS
AS BALLAST RESISTANCE
INSURING CURRENT SHARING
BETWEEN BOTH DEVICES
R1
120Ω
LT1083/4/5 ADJ TA03
R2
Improving Ripple Rejection
V
OUT
LT1083
ADJ
OUT
V
IN
IN
5V
R1
121Ω
1%
+
+
10µF
150µF
R2
365Ω
1%
+
C1
25µF*
*C1 IMPROVES RIPPLE REJECTION.
SHOULD BE < R1 AT RIPPLE FREQUENCY
X
1083/4/5 ADJ TA04
C
Remote Sensing
R
P
(MAX DROP 300mV)
V
OUT
V
IN
LT1083 OUT
ADJ
IN
5V
+
V
IN
100µF
2
3
7
–
25Ω
6
LM301A
1k
+
1
+
121Ω
R
10µF
L
8
4
5µF
100pF
365Ω
+
RETURN
25Ω
RETURN
1083/4/5 ADJ TA07
108345fh
15
LT1083/LT1084/LT1085
Typical applicaTion
High Efficiency Regulator with Switching Preregulator
1mH
V
IN
IN
LT1083 OUT
ADJ
V
OUT
28V
+
MR1122
10,000µF
28V
240Ω
2k
470Ω
1N914
10k
1k
1M
4N28
10k
+
1083/4/5 ADJ TA06
LT1011
10k
28V
–
1N914
1.2V to 15V Adjustable Regulator
†
V
IN
LT1083 OUT
ADJ
V
OUT
IN
R1
90.9Ω
+
+
C1*
10µF
C2
100µF
R2
1k
*NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS
†
R2
R1
V
OUT
= 1.25V 1 +
1083/4/5 ADJ TA08
5V Regulator with Shutdown*
V
OUT
LT1083
ADJ
V
OUT
IN
IN
5V
121Ω
1%
+
10µF
1k
+
100µF
365Ω
1%
2N3904
TTL
1k
1083/4/5 ADJ TA09
*OUTPUT SHUTS DOWN TO 1.3V
108345fh
16
LT1083/LT1084/LT1085
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
K Package
2-Lead TO-3 Metal Can
(Reference LTC DWG # 05-08-1310)
1.177 – 1.197
(29.90 – 30.40)
.760 – .775
.655 – .675
(16.64 – 17.15)
.320 – .350
(8.13 – 8.89)
(19.30 – 19.69)
.060 – .135
.210 – .220
(1.524 – 3.429)
(5.33 – 5.59)
.151 – .161
(3.86 – 4.09)
DIA, 2PLCS
.420 – .480
(10.67 – 12.19)
.425 – .435
.167 – .177
(4.24 – 4.49)
R
(10.80 – 11.05)
.038 – .043
.067 – .077
(1.70 – 1.96)
.490 – .510
(12.45 – 12.95)
R
(0.965 – 1.09)
K2 (TO-3) 0801
OBSOLETE PACKAGE
108345fh
17
For more information www.linear.com/LT1083
LT1083/LT1084/LT1085
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
M Package
3-Lead Plastic DD Pak
(Reference LTC DWG # 05-08-1460 Rev F)
.060
(1.524)
TYP
.390 – .415
(9.906 – 10.541)
.060
(1.524)
.165 – .180
(4.191 – 4.572)
.256
(6.502)
.045 – .055
(1.143 – 1.397)
15°
+.008
.004
–.004
.060
(1.524)
.183
(4.648)
.330 – .370
(8.382 – 9.398)
.059
(1.499)
+0.203
–0.102
0.102
(
)
.095 – .115
(2.413 – 2.921)
.075
(1.905)
DETAIL A
.013 – .023
.100
(2.54)
BSC
.050 .012
(1.270 0.305)
.300
(7.620)
+.012
.143
–.020
(0.330 – 0.584)
.050
(1.270)
+0.305
3.632
BOTTOM VIEW OF DD PAK
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
(
)
–0.508
DETAIL A
0° – 7° TYP
0° – 7° TYP
.420
.276
.080
.420
.350
.325
.585
.205
.585
.320
.090
.090
M (DD3) 0212 REV F
.100
.070
.070
.100
RECOMMENDED SOLDER PAD LAYOUT
RECOMMENDED SOLDER PAD LAYOUT
FOR THICKER SOLDER PASTE APPLICATIONS
NOTE:
1. DIMENSIONS IN INCH/(MILLIMETER)
2. DRAWING NOT TO SCALE
108345fh
18
For more information www.linear.com/LT1083
LT1083/LT1084/LT1085
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
P Package
3-Lead Plastic TO-3P (Similar to TO-247)
(Reference LTC DWG # 05-08-1450 Rev A)
.515 – .580
.187 – .207
(4.75 – 5.26)
(13.08 – 14.73)
.620 – .640
(15.75 – 16.26)
.305 – .370
(7.75 – 9.40)
.265 – .293
(6.73 – 7.44)
.060 – .081
(1.52 – 2.06)
MOUNTING HOLE
.115 – .145
(2.92 – 3.68)
DIA
18° – 22°
.560 – .620
(14.22 – 15.75)
.819 – .870
(20.80 – 22.10)
.170 – .215
(4.32 – 5.46)
.635 – .720
(16.13 – 18.29)
EJECTOR PIN MARKS
.105 – .125
.580 – .600
(14.73 – 15.24)
(2.67 – 3.18)
DIA
3° – 7°
.104 – .145
(2.64 – 3.68)
.170
(4.32)
MAX
.780 – .800
(19.81 – 20.32)
.042 – .052
(1.07 – 1.32)
.215
(5.46)
BSC
.087 – .102
(2.21 – 2.59)
BOTTOM VIEW OF TO-3P
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
.020 – .040
(0.51 – 1.02)
P3 0512 REV A
.074 – .084
(1.88 – 2.13)
.113 – .123
(2.87 – 3.12)
NOTE:
1. DIMENSIONS IN INCH/(MILLIMETER)
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED .030" (.762mm)
OBSOLETE PACKAGE
108345fh
19
For more information www.linear.com/LT1083
LT1083/LT1084/LT1085
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
T Package
3-Lead Plastic TO-220
(Reference LTC DWG # 05-08-1420)
.147 – .155
(3.734 – 3.937)
DIA
.165 – .180
(4.191 – 4.572)
.390 – .415
(9.906 – 10.541)
.045 – .055
(1.143 – 1.397)
.230 – .270
(5.842 – 6.858)
.570 – .620
(14.478 – 15.748)
.460 – .500
(11.684 – 12.700)
.330 – .370
(8.382 – 9.398)
.980 – 1.070
(24.892 – 27.178)
.520 – .570
(13.208 – 14.478)
.218 – .252
(5.537 – 6.401)
.013 – .023
(0.330 – 0.584)
.100
(2.540)
BSC
.095 – .115
(2.413 – 2.921)
T3 (TO-220) 0801
.050
(1.270)
TYP
.028 – .038
(0.711 – 0.965)
108345fh
20
For more information www.linear.com/LT1083
LT1083/LT1084/LT1085
revision hisTory (Revision history begins at Rev H)
REV
DATE
DESCRIPTION
PAGE NUMBER
H
06/15 Obsolete TO-3P package.
2, 19
108345fh
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
21
LT1083/LT1084/LT1085
Typical applicaTions
Automatic Light Control
Protected High Current Lamp Driver
12V
5A
LT1083
ADJ
V
OUT
LT1083
ADJ
15V
IN
IN
OUT
IN
TTL OR
CMOS
1.2k
+
1083/4/5 ADJ TA11
100µF
10µF
10k
1083/4/5 ADJ TA10
relaTeD parTs
PART NUMBER DESCRIPTION
COMMENTS
LT1129
LT1175
LT1185
LT1529
LT1580
LT1581
700mA Micropower Low Dropout Regulator
500mA Negative Low Dropout Micropower Regulator
3A Negative Low Dropout Regulator
50µA Quiescent Current
45µA I , 0.26V Dropout Voltage, SOT-223 Package
Q
V : –4.5V to –35V, 0.8V Dropout Voltage, DD-Pak and TO-220 Packages
IN
3A Low Dropout Regulator with 50µA I
7A, Very Low Dropout Regulator
10A, Very Low Dropout Regulator
7A/4.6A/3A Fast Response LDOs
500mV Dropout Voltage
Q
0.54V Dropout at 7A, Fixed 2.5V
and Adjustable
OUT
0.63V Dropout at 10A, Fixed 2.5V
and Adjustable
OUT
LT1584/
LT1585/
LT1587
Fast Transient Response for Microprocessor Applications
LT1761 Series 100mA, Low Noise, Low Dropout Micropower Regulators
in SOT-23
20µA Quiescent Current, 20µV
Noise, SOT-23 Package
RMS
LT1762 Series 150mA, Low Noise, LDO Micropower Regulators
LT1763 Series 500mA, Low Noise LDO Micropower Regulators
25µA Quiescent Current, 20µV
30µA Quiescent Current, 20µV
Noise, MSOP Package
Noise, SO-8 Package
RMS
RMS
LT1764
LT1962
LT1963
LT1964
3A Low Noise Fast Transient Response LDO
300mA, Low Noise LDO Micropower Regulator
1.5A, Low Noise, Fast Transient Response LDO
200mA, Low Noise, Negative LDO
40µV
20µV
40µV
Noise, 5-Lead DD Package
RMS
RMS
RMS
Noise, MSOP Package
Noise, SOT-223 Package
340mV Dropout Voltage, Low Noise 30µV
ThinSOT™ and 3mm × 3mm DFN-8 Packages
, V = –1.8V to –20V,
RMS IN
LT3015
1.5A, Low Noise, Negative Linear Regulator with Precision
Current Limit
V : –1.8V to –30V, V : –1.22V to –29.5V, Dropout Voltage: 310mV,
IN
OUT
Precision Current Limit with Foldback, Low Output Noise: 60μV
to 100kHz), TO-220, DD-Pak, DFN and MSOP Packages
(10Hz
RMS
LT3080/
LT3080-1
1.1A, Parallelable, Low Noise, Low Dropout Linear Regulator 300mV Dropout Voltage (2-Supply Operation), Low Noise: 40µV
,
RMS
V : 1.2V to 36V, V : 0V to 35.7V, Stable with Ceramic Caps, TO-220,
IN OUT
DD-Pak, SOT-223, MS8E and 3mm × 3mm DFN-8 Packages; "-1" Version
Has Integrated Internal Ballast Resistor
LT3090
600mA Low Noise Negative LDO with Programmable I
300mV Dropout Voltage, 18µV
Output Voltage Noise, Parallelable
LIMIT
RMS
50μA SET Pin Current: 1% Initial Accuracy, Positive/Negative Current
Monitors Wide Input Voltage Range: –1.5V to –36V, Rail-to-Rail Output
Voltage Range: 0V to –32V
108345fh
LT 0615 REV H • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
22
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LINEAR TECHNOLOGY CORPORATION 1994
(408)432-1900 FAX: (408) 434-0507 www.linear.com/LT1083
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