Datasheet LT1083, LT1084, LT1085 (Analog Devices)

LT1083/LT1084/LT1085 Fixed 3A, 5A, 7.5A Low Dropout Positive Fixed Regulators
FeaTures DescripTion
n Three-Terminal 3.3V, 3.6V, 5V and 12V The LT®1083 series of positive adjustable regulators are n Output Current of 3A, 5A or 7.5A designed to provide 3A, 5A and 7.5A with higher efficiency n Operates Down to 1V Dropout than currently available devices. All internal circuitry is n Guaranteed Dropout Voltage at Multiple Current Levels designed to operate down to 1V input to output differential n Line Regulation: 0.015% and the dropout voltage is fully specified as a function n Load Regulation: 0.1% of load current. Dropout is guaranteed at a maximum of n 100% Thermal Limit Functional Test 1.5V at maximum output current, decreasing at lower load n Adjustable Versions Available 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
applicaTions
overload conditions. n High Efficiency Linear Regulators The LT1083 series devices are pin compatible with older n Post Regulators for Switching Supplies three-terminal regulators. A 10µF output capacitor is n Constant Current Regulators required on these new devices; however, this is usually n Battery Chargers included in most regulator designs.
DEVICE OUTPUT CURRENT*
Unlike PNP regulators, where up to 10% of the output cur- LT1083 7.5 Amps rent is wasted as quiescent current, the LT1083 quiescent LT1084 5.0 Amps current flows into the load, increasing efficiency. LT1085 3.0 Amps L, LT, LTC, LTM, Linear Technology, the Linear logo and OPTI-LOOP are registered trademarks *For a 1.5A low dropout regulator see the LT1086 data sheet. 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 Dropout Voltage vs Output Current
2 VIN ≥ 6.5V LT1083-5 5V AT 7.5A + + 22µF* 10µF TANTALUM LT1083/4/5 TA01 1 *REQUIRED FOR STABILITY INPUT/OUTPUT VOLTAGE DIFFERENTIAL (V) 0 0 IFULLLOAD/2 IFULLLOAD OUTPUT CURRENT (A) 1083/4/5 TA02 1083ffe For more information www.linear.com/LT1083 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts