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Linear Technology Electronic Components Datasheet

LT1083 Datasheet

Low Dropout Positive Adjustable Regulators

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LT1083/LT1084/LT1085 Fixed
3A, 5A, 7.5A Low Dropout
Positive Fixed Regulators
Features
Description
nn Three-Terminal 3.3V, 3.6V, 5V and 12V
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 Adjustable Versions Available
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
7.5 Amps
5.0 Amps
3.0 Amps
*For a 1.5A low dropout regulator see the LT1086 data sheet.
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.
Typical Application
5V, 7.5A Regulator
VIN ≥ 6.5V
+
10µF
LT1083-5
5V AT 7.5A
+ 22µF*
TANTALUM
*REQUIRED FOR STABILITY
LT1083/4/5 TA01
Dropout Voltage vs Output Current
2
1
0
0
For more information www.linear.com/LT1083
IFULLLOAD/2
OUTPUT CURRENT (A)
IFULLLOAD
1083/4/5 TA02
1083ffe
1


Linear Technology Electronic Components Datasheet

LT1083 Datasheet

Low Dropout Positive Adjustable Regulators

No Preview Available !

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
3
2
1
T PACKAGE
3-LEAD PLASTIC TO-220
θJA = 50°C/W
VIN
VOUT
GND
VIN
CASE IS
OUTPUT
2
1
GND
K PACKAGE
2-LEAD TO-3 METAL CAN
θJA = 35°C/W
OBSOLETE PACKAGE
TAB IS
OUTPUT
FRONT VIEW
3
2
1
VIN
VOUT
GND
P PACKAGE
3-LEAD TO-3P PLASTIC
θJA = 35°C/W
OBSOLETE PACKAGE
TAB IS
OUTPUT
FRONT VIEW
3
2
1
VIN
VOUT
GND
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
1083ffe
2 For more information www.linear.com/LT1083


Part Number LT1083
Description Low Dropout Positive Adjustable Regulators
Maker Linear Technology
Total Page 18 Pages
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