LT1083/LT1084/LT1085 Fixed
3A, 5A, 7.5A Low Dropout
Positive Fixed Regulators
FeaTures
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DescripTion
The
LT
®
1083
series of positive adjustable regulators are
designed to provide 3A, 5A and 7.5A with higher efficiency
than currently available devices. All internal circuitry is
designed to operate down to 1V input to output differential
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
currents. On-chip trimming adjusts the output voltage to
1%. Current limit is also trimmed, minimizing the stress
on both the regulator and power source circuitry under
overload conditions.
The LT1083 series devices are pin compatible with older
three-terminal regulators. A 10µF output capacitor is
required on these new devices; however, this is usually
included in most regulator designs.
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, the Linear logo and OPTI-LOOP are registered trademarks
and UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Three-Terminal 3.3V, 3.6V, 5V and 12V
Output Current of 3A, 5A or 7.5A
Operates Down to 1V Dropout
Guaranteed Dropout Voltage at Multiple Current Levels
Line Regulation: 0.015%
Load Regulation: 0.1%
100% Thermal Limit Functional Test
Adjustable Versions Available
applicaTions
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High Efficiency Linear Regulators
Post Regulators for Switching Supplies
Constant Current Regulators
Battery Chargers
DEVICE
LT1083
LT1084
LT1085
OUTPUT CURRENT*
7.5 Amps
5.0 Amps
3.0 Amps
*For a 1.5A low dropout regulator see the LT1086 data sheet.
Typical applicaTion
5V, 7.5A Regulator
INPUT/OUTPUT VOLTAGE DIFFERENTIAL (V)
2
Dropout Voltage vs Output Current
V
IN
≥ 6.5V
LT1083-5
5V AT 7.5A
+
10µF
+
22µF*
TANTALUM
LT1083/4/5 TA01
*REQUIRED FOR STABILITY
1
0
0
I
FULLLOAD
/2
OUTPUT CURRENT (A)
I
FULLLOAD
1083/4/5 TA02
1083ffe
For more information
www.linear.com/LT1083
1
LT1083/LT1084/LT1085 Fixed
absoluTe MaxiMuM raTings
(Note 1)
Power Dissipation .............................. Internally Limited
Input Voltage* .......................................................... 30V
Operating Input Voltage
3.3V, 3.6V Devices ............................................... 20V
5V Devices ........................................................... 20V
12V Devices ......................................................... 25V
Operating Junction Temperature Range
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
*Although the devices maximum operating voltage is limited, (20V for
a 3V, 5V device, and 25V for a 12V device) the devices are guaranteed
to withstand transient input voltages up to 30V. For input voltages
greater than the maximum operating input voltage some degradation of
specifications will occur. For input/output voltage differentials greater than
15V, a minimum external load of 5mA is required to maintain regulation.
preconDiTioning
100% Thermal Limit Functional Test.
orDer inForMaTion
TAB IS
OUTPUT
FRONT VIEW
TAB IS
OUTPUT
V
IN
V
OUT
GND
FRONT VIEW
3
2
2
1
T PACKAGE
3-LEAD PLASTIC TO-220
θ
JA
= 50°C/W
1
P PACKAGE
3-LEAD TO-3P PLASTIC
θ
JA
= 35°C/W
V
IN
V
OUT
GND
3
OBSOLETE PACKAGE
CASE IS
OUTPUT
FRONT VIEW
3
TAB IS
OUTPUT
2
1
M PACKAGE
3-LEAD PLASTIC DD
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
GND
V
IN
2
1
GND
K PACKAGE
2-LEAD TO-3 METAL CAN
θ
JA
= 35°C/W
OBSOLETE PACKAGE
2
1083ffe
For more information
www.linear.com/LT1083
LT1083/LT1084/LT1085 Fixed
orDer inForMaTion
LEAD FREE FINISH
LT1083CP-5#PBF
LT1083CP-12#PBF
LT1084CP-5#PBF
LT1084CP-12#PBF
TAPE AND REEL
NA
NA
NA
NA
PART MARKING
LT1083CP-5
LT1083CP-12
LT1084CP-5
LT1084CP-12
OBSOLETE PACKAGE
LT1084CT-3.3#PBF
LT1084CT-5#PBF
LT1084CT-12#PBF
LT1085CT-3.3#PBF
LT1085CT-3.6#PBF
LT1085CT-5#PBF
LT1085CT-12#PBF
LT1085CM-3.3#PBF
LT1085CM-3.6#PBF
LT1085IM-3.6#PBF
LEAD BASED FINISH
LT1083CP-5
LT1083CP-12
LT1084CP-5
LT1084CP-12
LT1083CK-5
LT1083CK-12
LT1083MK-5
LT1083MK-12
NA
NA
NA
NA
NA
NA
NA
LT1085CM-3.3#TRPBF
LT1085CM-3.6#TRPBF
LT1085IM-3.6#TRPBF
TAPE AND REEL
NA
NA
NA
NA
NA
NA
NA
NA
LT1084CT-3.3
LT1084CT-5
LT1084CT-12
LT1085CT-3.3
LT1085CT-3.6
LT1085CT-5
LT1085-12
LT1085CM-3.3
LT1085CM-3.6
LT1085IM-3.6
PART MARKING
LT1083CP-5
LT1083CP-12
LT1084CP-5
LT1084CP-12
LT1083CK-5
LT1083CK-12
LT1083MK-5
LT1083MK-12
3-Lead Plastic TO-220
3-Lead Plastic TO-220
3-Lead Plastic TO-220
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
3-Lead Plastic DD
PACKAGE DESCRIPTION
3-Lead Plastic TO-3P
3-Lead Plastic TO-3P
3-Lead Plastic TO-3P
3-Lead Plastic TO-3P
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: 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: 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: 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
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: 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: –55°C to 150°C
Power: –55°C to 200°C
Control: –55°C to 150°C
Power: –55°C to 200°C
PACKAGE DESCRIPTION
3-Lead Plastic TO-3P
3-Lead Plastic TO-3P
3-Lead Plastic TO-3P
3-Lead Plastic TO-3P
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: 0°C to 125°C
Power: 0°C to 150°C
1083ffe
For more information
www.linear.com/LT1083
3
LT1083/LT1084/LT1085 Fixed
orDer inForMaTion
LEAD BASED FINISH
LT1084CK-5
LT1084CK-12
LT1084MK-5
LT1084MK-12
LT1085CK-5
LT1085CK-12
LT1085MK-5
LT1085MK-12
TAPE AND REEL
NA
NA
NA
NA
NA
NA
NA
NA
PART MARKING
LT1084CK-5
LT1084CK-12
LT1084MK-5
LT1084MK-12
LT1085CK-5
LT1085CK-12
LT1085MK-5
LT1085MK-12
OBSOLETE PACKAGE
LT1084CT-3.3
LT1084CT-5
LT1084CT-12
LT1085CT-3.3
LT1085CT-3.6
LT1085CT-5
LT1085CT-12
LT1085CM-3.3
LT1085CM-3.6
LT1085IM-3.6
NA
NA
NA
NA
NA
NA
NA
LT1085CM-3.3#TR
LT1085CM-3.6#TR
LT1085IM-3.6#TR
LT1084CT-3.3
LT1084CT-5
LT1084CT-12
LT1085CT-3.3
LT1085CT-3.6
LT1085CT-5
LT1085-12
LT1085CM-3.3
LT1085CM-3.6
LT1085IM-3.6
3-Lead Plastic TO-220
3-Lead Plastic TO-220
3-Lead Plastic TO-220
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
3-Lead Plastic DD
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: 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: 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
PACKAGE DESCRIPTION
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
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: –55°C to 150°C
Power: –55°C to 200°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: 0°C to 125°C
Power: 0°C to 150°C
Control: –55°C to 150°C
Power: –55°C to 200°C
Control: –55°C to 150°C
Power: –55°C to 200°C
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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1083ffe
For more information
www.linear.com/LT1083
LT1083/LT1084/LT1085 Fixed
elecTrical characTerisTics
PARAMETER
Output Voltage
CONDITIONS
LT1084-3.3
LT1085-3.3
LT1085-3.6
I
OUT
= 0mA, T
J
= 25°C, V
IN
= 8V (K Package Only)
4.8V ≤ V
IN
≤ 15V, 0 ≤ I
OUT
≤ I
FULL_LOAD
(Notes 3, 4, 9)
V
IN
= 5V, I
OUT
= 0mA, T
J
= 25°C (K Package Only)
4.8V ≤ V
IN
≤ 15V, 0 ≤ I
OUT
≤ I
FULL_LOAD
(Notes 3, 4, 9)
V
IN
= 5V, I
OUT
= 0mA, T
J
= 25°C (K Package Only)
5V ≤ V
IN
≤ 15V, 0 ≤ I
OUT
≤ I
FULL_LOAD
(Note 9)
5V ≤ V
IN
≤ 15V, 0 ≤ I
OUT
≤ I
FULL_LOAD
, T
J
≥ 0°C (Notes 3, 4, 9)
5V ≤ V
IN
≤ 15V, 0 ≤ I
OUT
≤ 2.5A (Notes 3, 4, 9)
V
IN
= 4.75V, I
OUT
= 3A, T
J
≥ 0°C
V
IN
= 4.75V, I
OUT
= 2.5A, T
J
≥ 0°C
V
IN
= 4.75V, I
OUT
= 1.5A, T
J
> 0°C
I
OUT
= 0mA, T
J
= 25°C, V
IN
= 8V (K Package Only)
0 ≤ I
OUT
≤ I
FULL_LOAD
, 6.5V ≤ V
IN
≤ 20V (Notes 4, 6, 7, 9)
I
OUT
= 0mA, T
J
= 25°C, V
IN
= 15V (K Package Only)
0 ≤ I
OUT
≤ I
FULL_LOAD
, 13.5V ≤ V
IN
≤ 25V (Notes 4, 6, 7, 9)
I
OUT
= 0mA, T
J
= 25°C, 4.8V ≤ V
IN
≤ 15V
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The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
MIN
3.270
3.235
3.270
3.235
3.564
3.500
3.528
3.528
3.350
3.450
3.528
4.950
4.900
11.880
11.760
5.000
5.000
12.000
12.000
0.5
1.0
0.5
1.0
0.5
1.0
0.5
1.0
1.0
2.0
3
7
3
7
3
7
5
10
12
24
1.3
1.3
1.3
1.3
8.0
8.0
5.5
5.5
5.5
3.2
3.2
3.2
9.5
9.5
6.5
6.5
6.5
4.0
4.0
4.0
TYP
3.300
3.300
3.300
3.300
3.600
MAX
3.330
3.365
3.330
3.365
3.636
3.672
3.672
3.672
3.672
3.672
3.672
5.050
5.100
12.120
12.240
6
6
6
6
6
6
10
10
25
25
15
20
15
20
15
20
20
35
36
72
1.5
1.5
1.5
1.5
UNITS
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
V
V
V
V
A
A
A
A
A
A
A
A
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LT1085-3.6
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LT1083/4/5-5
LT1083/4/5-12
Line Regulation
LT1084-3.3
LT1085-3.3
LT1085-3.6
LT1083/4/5-5
LT1083/4/5-12
Load Regulation
LT1084-3.3
LT1085-3.3
LT1085-3.6
LT1083/4/5-5
LT1083/4/5-12
Dropout Voltage
LT1084/5-3.3
LT1085-3.6
LT1083/4/5-5
LT1083/4/5-12
Current Limit
LT1083-5
LT1083-12
LT1084-3.3
LT1084-5
LT1084-12
LT1085-3.3/3.6
LT1085-5
LT1085-12
4.8V ≤ V
IN
≤ 15V, I
OUT
= 0mA, T
J
= 25°C
l
4.8V ≤ V
IN
≤ 15V, I
OUT
= 0mA, T
J
= 25°C
l
I
OUT
= 0mA, T
J
= 25°C, 6.5V ≤ V
IN
≤ 20V (Notes 2, 3)
l
I
OUT
= 0mA, T
J
= 25°C, 13.5V ≤ V
IN
≤ 25V (Notes 2, 3)
l
V
IN
= 5V, 0 ≤ I
OUT
≤ 5A, T
J
= 25°C
l
V
IN
= 5V, 0 ≤ I
OUT
≤ 3A, T
J
= 25°C
l
V
IN
= 5.25V, 0 ≤ I
OUT
≤ 3A, T
J
= 25°C
l
V
IN
= 8V, 0 ≤ I
OUT
≤ I
FULL_LOAD
, T
J
= 25°C (Notes 2, 3, 4, 6)
l
V
IN
= 15V, 0 ≤ I
OUT
≤ I
FULL_LOAD
, T
J
= 25°C (Notes 2, 3, 4, 6)
l
∆V
OUT
= 33mV, I
OUT
= I
FULL_LOAD
(Notes 5, 6)
∆V
OUT
= 36mV, I
OUT
= I
FULL_LOAD
(Notes 5, 6)
∆V
OUT
= 50mV, I
OUT
= I
FULL_LOAD
(Notes 5, 6)
∆V
OUT
= 120mV, I
OUT
= I
FULL_LOAD
(Notes 5, 6)
V
IN
= 10V
V
IN
= 17V
V
IN
= 8V
V
IN
= 10V
V
IN
= 17V
V
IN
= 8V
V
IN
= 10V
V
IN
= 17V
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For more information
www.linear.com/LT1083
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