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LT1085 Dataheets PDF



Part Number LT1085
Manufacturers Linear
Logo Linear
Description Low Dropout Positive Fixed Regulator
Datasheet LT1085 DatasheetLT1085 Datasheet (PDF)

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 Supplie.

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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 7.5A LT1084 5.0A LT1085 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 currents. 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 current 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 INPUT/OUTPUT VOLTAGE DIFFERENTIAL (V) 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 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 108345fh 2 For more information www.linear.com/LT1083 LT1083/LT1084/LT1085 Order Information LEAD FREE FINISH LT1083CP#PBF TAPE AND REEL NA LT1084CP#PBF NA LT1084CT#PBF LT1084IT#PBF LT1085CT#PBF LT1085IT#PBF LT1085CM#PBF LT1085IM#PBF LEAD BASED FINISH LT1083CP LT1084CP NA NA NA NA LT1085CM#TRPBF LT1085IM#TRPBF TAPE AND REEL NA NA LT1084CT LT1084IT LT1085CT LT1085IT LT1085CM LT1085IM NA NA NA NA LT1085CM#TR LT1085IM#TR PART MARKING LT1083CP PACKAGE DESCRIPTION 3-Lead Plastic TO-3P LT1084CP 3-Lead Plastic TO-3P OBSOLETE PACKAGE LT1084CT 3-Lead Plastic TO-220 LT1084IT 3-Lead Plastic TO-220 LT1085CT 3-Lead Plastic TO-220 LT1085IT 3-Lead Plastic TO-220 LT1085CM 3-Lead Plastic DD LT1085IM 3-Lead Plastic DD PART MARKING LT1083CP PACKAGE DESCRIPTION 3-Lead Plastic TO-3P LT1084CP 3-Lead Plastic TO-3P OBSOLETE PACKAGE LT1084CT 3-Lead Plastic TO-220 LT1084IT 3-Lead Plastic TO-220 LT1085CT 3-Lead Plastic TO-220 LT1085IT 3-Lead Plastic TO-220 LT1085CM 3-Lead Plastic DD LT1085IM 3-Lead Plastic DD 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 Pow.


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