LT1083 LINER [Linear Technology], LT1083 Datasheet

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LT1083

Manufacturer Part Number
LT1083
Description
3A, 5A, 7.5A Low Dropout Positive Fixed Regulators
Manufacturer
LINER [Linear Technology]
Datasheet

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APPLICATIONS
FEATURES
*For a 1.5A low dropout regulator see the LT1086 data sheet.
TYPICAL
High Efficiency Linear Regulators
Post Regulators for Switching Supplies
Constant Current Regulators
Battery Chargers
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
V
IN
6.5V
DEVICE
LT1083
LT1084
LT1085
APPLICATION
+
10µF
U
5V, 7.5A Regulator
*REQUIRED FOR STABILITY
LT1083-5
OUTPUT CURRENT*
U
7.5 Amps
5.0 Amps
3.0 Amps
+
LT1083/4/5 TA01
22µF*
TANTALUM
5V AT 7.5A
DESCRIPTION
The LT1083 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 1083 series devices are pin compatible with older
three-terminal regulators. A 10 F 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
current is wasted as quiescent current, the LT1083 quies-
cent current flows into the load, increasing efficiency.
3A, 5A, 7.5A Low Dropout
Positive Fixed Regulators
2
1
0
0
Dropout Voltage vs Output Current
U
LT1083/84/85 Fixed
OUTPUT CURRENT (A)
I
FULL LOAD
/2
1083/4/5 TA02
I
FULL LOAD
1

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LT1083 Summary of contents

Page 1

... 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 7.5 Amps current is wasted as quiescent current, the LT1083 quies- 5.0 Amps cent current flows into the load, increasing efficiency. 3.0 Amps 5V AT 7.5A + 22µ ...

Page 2

... LT1083/84/85 Fixed ABSOLUTE MAXIMUM Power Dissipation............................... Internally Limited Input Voltage (Note 1) ............................................. 30V Operating Input Voltage 3.3V, 3.6V Devices ............................................ 20V 5V Devices ........................................................ 20V 12V Devices ...................................................... 25V Operating Junction Temperature Range “C” Grades Control Section ............................... 125 C Power Transistor ............................. 150 C “M” Grades Control Section ........................... – ...

Page 3

... FULL LOAD = 10V = 17V = 8V = 10V = 17V = 8V = 10V = 17V = 18V = 18V = 18V 20V 25V = 25 C, 30ms pulse = I OUT FULLLOAD = 25 F Tantalum 5A, V OUT OUT IN LT1083/84/85 Fixed MIN TYP 3.528 3.350 3.450 3.528 4.950 5.000 4.900 5.000 11.880 12.000 12.120 11.760 12.000 12.240 0.5 1.0 0.5 1.0 0.5 1.0 0.5 1.0 1.0 2.0 ...

Page 4

... 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 4: Dropout voltage is specified over the full output current range of the device ...

Page 5

... LT1085 Load Regulation 0. 0.05 0 –0.05 –0.10 –0.15 –0. –50 – TEMPERATURE (°C) Temperature Stability 2.0 1.0 P-P 0 –1.0 –2.0 50 –50 – 1.0 TEMPERATURE (° 100 125 150 LT1083/4/5 FIXED G06 75 100 125 150 LT1083/4/5 FIXED G09 75 100 125 150 LT1183/4/5 FIXED G12 5 ...

Page 6

... LT1083CK 100 110 120 130 140 150 1.0 CASE TEMPERATURE (° LIMITED BY MAXIMUM JUNCTION TEMPERATURE LT1085 Maximum Power Dissipation* LT1085MK LT1085CT LT1085CK 100 110 120 130 140 150 CASE TEMPERATURE (°C) LT1083/4/5 FIXED G17 LT1083/4/5 FIXED G15 ...

Page 7

... Negitive resistance during current limit is not unique to the LT1083 series and has been present on all power IC regulators. The value of negative resistance is a function of how fast the current limit is folded back as input-to- ...

Page 8

... OUT IN ADJ 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 ...

Page 9

... Note that the case of all devices in this series is electronically connected to the ouput. U TYPICAL APPLICATIONS 28V INPUT 10k W U For example, using a LT1083-5CK (TO-3, Commercial) and assuming: V (max continuous CASE-TO-HEAT SINK thermal compound. ...

Page 10

... FILM RESISTOR L-DALE TO-5 TYPE T2-STANCOR 11Z-2003 REGULATOR WITH SCR PREREGULATOR TO LOWER POWER DISSIPATION. ABOUT 1.7V DIFFERENTIAL IS MAINTAINED ACROSS THE LT1083 INDEPENDENT OF LOAD CURRENT. 10 Paralleling Regulators 2 FEET #18 WIRE* IN LT1083-5 OUT GND 0.015 IN LT1083-5 OUT *THE #18 WIRE ACTS ...

Page 11

... GND + 10,000µF Battery Backed Up Regulated Supply LT1084-5 + 10µF 50 SELECT FOR CHARGE RATE LT1084-5 + 6.5V 10µF LT1083/84/85 Fixed Regulator with Reference 10V LT1085 100µF 10µF 5V OUT LT1029 LT1083/4/5 TA07 + 100µ –12V OUT LT1083/4/5 TA08 5.2V LINE 5.0V BATTERY + 100µF LT1083/4/5 TA09 11 ...

Page 12

... LT1083/84/85 Fixed PACKAGE DESCRIPTION M Package 3-Lead Plastic DD 0.401 ± 0.015 0.060 (10.185 ± 0.381) (1.524) 0.175 ± 0.008 (4.445 ± 0.203) 15° TYP +0.012 0.331 –0.020 +0.305 8.407 –0.508 0.100 ± 0.010 +0.012 (2.5402 ± 0.254) 0.143 –0.020 0.050 ± ...

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