C-Grades: Control Section .................. 0°C to 125°C
Power Transistor ................ 0°C to 150°C
I-Grades: Control Section ..............– 40°C to 125°C
Power Transistor ............– 40°C to 150°C
M-Grades:
(OBSOLETE)
Control Section ..............– 55°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.
PIN CONFIGURATION
FRONT VIEW
TAB
IS
OUTPUT
3
2
1
T PACKAGE
3-LEAD PLASTIC TO-220
θ
JA
= 50°C/W
BOTTOM VIEW
V
IN
2
CASE IS
OUTPUT
TAB
IS
OUTPUT
FRONT VIEW
3
2
1
M PACKAGE
3-LEAD PLASTIC DD
K PACKAGE
2-LEAD TO-3 METAL CAN
θ
JA
= 35°C/W
θ
JA
= 30°C/W*
*WITH PACKAGE SOLDERED TO 0.5IN
2
COPPER AREA OVER
BACKSIDE GROUND PLANE OR INTERNAL POWER PLANE.
θ
JA
CAN VARY
FROM 20°C/W TO >40°C/W DEPENDING ON MOUNTING TECHNIQUE
V
IN
V
OUT
ADJ
V
IN
V
OUT
ADJ
TAB IS
OUTPUT
FRONT VIEW
3
2
1
P PACKAGE
3-LEAD PLASTIC TO-3P
θ
JA
= 35°C/W
V
IN
V
OUT
ADJ
1
ADJ
OBSOLETE PACKAGE
108345fg
2
LT1083/LT1084/LT1085
ORDER INFORMATION
LEAD FREE FINISH
LT1083CP#PBF
LT1084CP#PBF
LT1084CT#PBF
LT1084IT#PBF
LT1085CT#PBF
LT1085IT#PBF
LT1085CM#PBF
LT1085IM#PBF
LEAD BASED FINISH
LT1083CP
LT1084CP
LT1084CT
LT1084IT
LT1085CT
LT1085IT
LT1085CM
LT1085IM
LT1083CK
LT1083MK
LT1084CK
LT1084MK
LT1085CK
LT1085MK
TAPE AND REEL
LT1083CP#TRPBF
LT1084CP#TRPBF
LT1084CT#TRPBF
LT1084IT#TRPBF
LT1085CT#TRPBF
LT1085IT#TRPBF
LT1085CM#TRPBF
LT1085IM#TRPBF
TAPE AND REEL
LT1083CP#TR
LT1084CP#TR
LT1084CT#TR
LT1084IT#TR
LT1085CT#TR
LT1085IT#TR
LT1085CM#TR
LT1085IM#TR
LT1083CK#TR
LT1083MK#TR
LT1084CK#TR
LT1084MK#TR
LT1085CK#TR
LT1085MK#TR
PART MARKING*
LT1083CP
LT1084CP
LT1084CT
LT1084IT
LT1085CT
LT1085IT
LT1085CM
LT1085IM
PART MARKING*
LT1083CP
LT1084CP
LT1084CT
LT1084IT
LT1085CT
LT1085IT
LT1085CM
LT1085IM
LT1083CK
LT1083MK
LT1084CK
LT1084MK
LT1085CK
LT1085MK
PACKAGE DESCRIPTION
3-Lead Plastic TO-3P
3-Lead Plastic TO-3P
3-Lead Plastic TO-220
3-Lead Plastic TO-220
3-Lead Plastic TO-220
3-Lead Plastic TO-220
3-Lead Plastic DD
3-Lead Plastic DD
PACKAGE DESCRIPTION
3-Lead Plastic TO-3P
3-Lead Plastic TO-3P
3-Lead Plastic TO-220
3-Lead Plastic TO-220
3-Lead Plastic TO-220
3-Lead Plastic TO-220
3-Lead Plastic DD
3-Lead Plastic DD
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
2-Lead TO-3 Metal Can
TEMPERATURE RANGE
Control: 0°C to 125°C
Power: 0°C to 150°C
Control: 0°C to 125°C
Power: 0°C to 150°C
Control: 0°C to 125°C
Power: 0°C to 150°C
Control: –40°C to 125°C
Power: –40°C to 150°C
Control: 0°C to 125°C
Power: 0°C to 150°C
Control: –40°C to 125°C
Power: –40°C to 150°C
Control: 0°C to 125°C
Power: 0°C to 150°C
Control: –40°C to 125°C
Power: –40°C to 150°C
TEMPERATURE RANGE
Control: 0°C to 125°C
Power: 0°C to 150°C
Control: 0°C to 125°C
Power: 0°C to 150°C
Control: 0°C to 125°C
Power: 0°C to 150°C
Control: –40°C to 125°C
Power: –40°C to 150°C
Control: 0°C to 125°C
Power: 0°C to 150°C
Control: –40°C to 125°C
Power: –40°C to 150°C
Control: 0°C to 125°C
Power: 0°C to 150°C
Control: –40°C to 125°C
Power: –40°C to 150°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
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. *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/
108345fg
3
LT1083/LT1084/LT1085
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Reference Voltage
CONDITIONS
I
OUT
= 10mA, T
J
= 25°C,
(V
IN
– V
OUT
) = 3V
10mA ≤ I
OUT
≤ I
FULL_LOAD
1.5V ≤ (V
IN
– V
OUT
) ≤ 25V (Notes 4, 6, 7)
I
LOAD
= 10mA, 1.5V ≤ (V
IN
– V
OUT
) ≤ 15V, T
J
= 25°C (Notes 2, 3)
M-Grade: 15V ≤ (V
IN
– V
OUT
) ≤ 35V (Notes 2, 3)
C-, I-Grades: 15V ≤ (V
IN
– V
OUT
) ≤ 30V (Notes 2, 3)
Load Regulation
Dropout Voltage
Current Limit
LT1083
LT1084
LT1085
Minimum Load Current
Thermal Regulation
LT1083
LT1084
LT1085
Ripple Rejection
Adjust Pin Current
Adjust Pin Current Change
Temperature Stability
Long-Term Stability
RMS Output Noise (% of V
OUT
)
T
A
= 125°C, 1000 Hrs
T
A
= 25°C, 10Hz = ≤ f ≤ 10kHz
(V
IN
– V
OUT
) = 3V, 10mA ≤ I
OUT
≤ I
FULL_LOAD
, T
J
= 25°C
(Notes 2, 3, 4, 6)
ΔV
REF
= 1%, I
OUT
= I
FULL_LOAD
(Notes 5, 6, 8)
(V
IN
– V
OUT
) = 5V
(V
IN
– V
OUT
) = 25V
(V
IN
– V
OUT
) = 5V
(V
IN
– V
OUT
) = 25V
(V
IN
– V
OUT
) = 5V
(V
IN
– V
OUT
) = 25V
(V
IN
– V
OUT
) = 25V
T
A
= 25°C, 30ms Pulse
0.002
0.003
0.004
f = 120Hz, C
ADJ
= 25μF, C
OUT
= 25μF Tantalum
I
OUT
= I
FULL_LOAD
, (V
IN
– V
OUT
) = 3V (Notes 6, 7, 8)
T
J
= 25°C
10mA ≤ I
OUT
≤ I
FULL_LOAD
, 1.5V ≤ (V
IN
– V
OUT
) ≤ 25V (Note 6)
l
ELECTRICAL CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating
MIN
1.238
l
l
l
l
l
l
l
l
l
l
l
l
l
TYP
1.250
1.250
0.015
0.035
0.05
0.05
0.1
0.2
1.3
MAX
1.262
1.270
0.2
0.2
0.5
0.5
0.3
0.4
1.5
UNITS
V
V
%
%
%
%
%
%
V
A
A
A
A
A
A
1.225
Line Regulation
8.0
0.4
5.5
0.3
3.2
0.2
9.5
1.0
6.5
0.6
4.0
0.5
5
10
0.010
0.015
0.020
mA
%/W
%/W
%/W
dB
μA
μA
μA
%
%
%
60
75
55
120
0.2
0.5
0.3
0.003
1
5
l
l
l
108345fg
4
LT1083/LT1084/LT1085
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Thermal Resistance Junction-to-Case
LT1083
LT1084
LT1085
CONDITIONS
Control Circuitry/Power Transistor
K Package
P Package
K Package
P Package
T Package
K Package
M, T Package
ELECTRICAL CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating
MIN
TYP
MAX
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
UNITS
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
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:
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 4:
I
FULL_LOAD
is defined in the current limit curves. The I
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 6:
For LT1083 I
FULL_LOAD
is 5A for – 55°C ≤ T
J
< – 40°C and 7.5A for
T
J
≥ –40°C.
Note 7:
1.7V ≤ (V
IN
– V
OUT
) ≤ 25V for LT1084 at – 55°C ≤ T
J
≤ – 40°C.
Note 8:
Dropout is 1.7V maximum for LT1084 at – 55°C ≤ T
J
≤ –40°C.
Note 9:
The LT1083/LT1084/LT1085 regulators are tested and specified
under pulse load conditions such that T
J
≅
T
A
. The C-grade LT1083/
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
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PCB Design
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