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Linear Technology Electronic Components Datasheet

LT1084 Datasheet

Low Dropout Positive Adjustable Regulators

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LT1083/LT1084/LT1085
7.5A, 5A, 3A Low Dropout
Positive Adjustable Regulators
Features
nn 3-Terminal Adjustable
nn Output Current of 3A, 5A or 7.5A
nn Operates Down to 1V Dropout
nn Guaranteed Dropout Voltage at Multiple Current Levels
nn Line Regulation: 0.015%
nn Load Regulation: 0.1%
nn 100% Thermal Limit Functional Test
nn Fixed Versions Available
nn Available in 3-Lead Plastic TO-220 and DD Packages
Applications
nn High Efficiency Linear Regulators
nn Post Regulators for Switching Supplies
nn Constant Current Regulators
nn Battery Chargers
DEVICE
OUTPUT CURRENT*
LT1083
LT1084
LT1085
7.5A
5.0A
3.0A
*For a 1.5A low dropout regulator see the LT1086 data sheet.
Description
The LT®1083 series of positive adjustable regulators are
designed to provide 7.5A, 5A and 3A 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 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.
The LT1083/LT1084/LT1085 devices are pin compatible
with older 3-terminal regulators. A 10µF output capacitor
is required on these new devices. However, this is 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 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.
Typical Application
5V, 7.5A Regulator
VIN ≥ 6.5V
+
IN
10µF
LT1083 OUT
ADJ
*REQUIRED FOR STABILITY
121Ω
1% +
365Ω
1%
5V AT 7.5A
10µF*
TANTALUM
1083/4/5 ADJ TA01
Dropout Voltage vs Output Current
2
1
0
0 IFULL LOAD
OUTPUT CURRENT
1083/4/5 ADJ TA02
For more information www.linear.com/LT1083
108345fh
1


Linear Technology Electronic Components Datasheet

LT1084 Datasheet

Low Dropout Positive Adjustable Regulators

No Preview Available !

LT1083/LT1084/LT1085
Absolute Maximum Ratings (Note 1)
Power Dissipation................................ Internally Limited
Input-to-Output Voltage Differential
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
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
TAB
IS
OUTPUT
FRONT VIEW
3
2
1
T PACKAGE
3-LEAD PLASTIC TO-220
θJA = 50°C/W
VIN
VOUT
ADJ
BOTTOM VIEW
VIN
CASE IS
OUTPUT
2
1
ADJ
K PACKAGE
2-LEAD TO-3 METAL CAN
θJA = 35°C/W
OBSOLETE PACKAGE
TAB IS
OUTPUT
FRONT VIEW
3
2
1
VIN
VOUT
ADJ
P PACKAGE
3-LEAD PLASTIC TO-3P
θJA = 35°C/W
OBSOLETE PACKAGE
TAB
IS
OUTPUT
FRONT VIEW
3
2
1
VIN
VOUT
ADJ
M PACKAGE
3-LEAD PLASTIC DD
θJA = 30°C/W*
*WITH PACKAGE SOLDERED TO 0.5IN2 COPPER AREA OVER
BACKSIDE GROUND PLANE OR INTERNAL POWER PLANE. θJA CAN VARY
FROM 20°C/W TO >40°C/W DEPENDING ON MOUNTING TECHNIQUE
2
For more information www.linear.com/LT1083
108345fh


Part Number LT1084
Description Low Dropout Positive Adjustable Regulators
Maker Linear Technology
Total Page 22 Pages
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