LT1086 Series 1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 3.6V, 5V, 12V FEATURES DESCRIPTIO n 3-Terminal Adjustable or Fixed The LT 1086 is designed to provide up to 1.5A output 2.85V, 3.3V, 3.6V, 5V, 12V current. All internal circuitry is designed to operate down n Output Current of 1.5A (0.5A for LT1086H) to 1V input-to-output differential and the dropout voltage n Operates Down to 1V Dropout is fully specified as a function of load current. Dropout is n Guaranteed Dropout Voltage at Multiple Current Levels guaranteed at several operating points up to a maximum n Line Regulation: 0.015% of 1.5V at maximum output current. Dropout decreases at n Load Regulation: 0.1% lower load currents. On-chip trimming adjusts the refer- n 100% Thermal Limit Functional Test ence/ouput voltage to 1%. Current limit is also trimmed, n Ripple Rejection >75dB minimizing the stress on both the regulator and power n Available in 3-Pin TO-220 and 3-Pin DD Packages source circuitry under overload conditions. The LT1086 is pin compatible with older 3-terminal adjust- U able regulators. A minimum 10m F output capacitor is APPLICATIO S required on these devices. n SCSI-2 Active Terminator The LT1086 offers excellent line and load regulation speci- n High Efficiency Linear Regulators fications and ripple rejection exceeds 75dB even at the n Post Regulators for Switching Supplies maximum load current of 1.5A. The LT1086 is floating n Constant Current Regulators architecture with a composite NPN output stage. All of the n Battery Chargers quiescent current and the drive current for the output n Microprocessor Supply stage flows to the load increasing efficiency. The LT1086 is available in a 3-pin TO-220 package and a space-saving surface mountable 3-pin DD package. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO LT1086 Dropout Voltage 2 INDICATES GUARANTEED TEST POINT 5V to 3.3V Regulator 55C T 150C J 0C T 125C J V 4.75V 3.3V AT 1.5A IN IN LT1086-3.3 OUT GND 1 10F* 10F T = 55C TANTALUM TANTALUM J T = 25C J T = 150C J LT1086 TA01 *MAY BE OMITTED IF INPUT SUPPLY IS WELL 0 BYPASSED WITHIN 2 OF THE LT1086 0 0.5 1 1.5 OUTPUT CURRENT (A) LT1086 TA02 sn1086 1086ffs 1 MINIMUM INPUT/OUTPUT DIFFERENTIAL (V) U ULT1086 Series (Note 1) ABSOLUTE MAXIMUM RATINGS Power Dissipation............................... Internally Limited M Grades Input Voltage* ......................................................... 30V Control Section .......................... 55 C to 150 C Operating Input Voltage Power Transistor........................ 55 C to 200 C Adjustable Devices ........................................... 25V Storage Temperature Range ................. 65 C to 150 C 2.85V Devices .................................................. 18V Lead Temperature (Soldering, 10 sec).................. 300 C 3.3V, 3.6V, and 5V Devices ............................... 20V * Although the devices maximum operating voltage is limited, (18V for a 12V Devices ...................................................... 25V 2.85V device, 20V for a 5V device, and 25V for adjustable and12V devices) the Operating Junction Temperature Range devices are guaranteed to withstand transient input voltages up to 30V. For input voltages greater than the maximum operating input voltage some C Grades degradation of specifications will occur. For fixed voltage devices operating at Control Section ............................... 0 C to 125 C input/output voltage differentials greater than 15V, a minimum external load Power Transistor ............................. 0 C to 150 C of 5mA is required to maintain regulation. I Grades Control Section .......................... 40 C to 125 C PRECONDITIONING Power Transistor ........................ 40 C to 150 C 100% Thermal Shutdown Functional Test. PACKAGE/ORDER INFORMATION FRONT VIEW ORDER ORDER BOTTOM VIEW PART NUMBER PART NUMBER 3 V IN ADJ TAB IS V 2 OUT OUTPUT LT1086CM LT1086CH 2 ADJ 1 V 13 V IN OUT LT1086CM-3.3 LT1086MH (GND) (CASE) M PACKAGE LT1086CM-3.6 3-LEAD PLASTIC DD LT1086IM q = 30 C/W** H PACKAGE JA 3-LEAD TO-39 METAL CAN 2 LT1086IM-3.3 ** WITH PACKAGE SOLDERED TO 0.5IN COPPER AREA OVER BACKSIDE GROUND PLANE OR INTERNAL POWER q = 150 C/W JA PLANE. q CAN VARY FROM 20 C/W TO >40 C/W JA DEPENDING ON MOUNTING TECHNIQUE. ORDER ORDER PART NUMBER PART NUMBER BOTTOM VIEW CASE FRONT VIEW V IN LT1086CK IS OUTPUT LT1086CT 2 LT1086CK-5 3 V LT1086CT-2.85 IN TAB IS LT1086CK-12 2 V LT1086CT-3.3 OUT OUTPUT 1 LT1086IK 1 ADJ LT1086IT (GND) LT1086IK-5 ADJ (GND)* LT1086IT-5 T PACKAGE 3-LEAD PLASTIC TO-220 LT1086IK-12 K PACKAGE LT1086IT-12 2-LEAD TO-3 METAL CAN q = 50 C/W JA LT1086MK LT1086CT-3.6 q = 35 C/W JA LT1086MK-5 LT1086CT-5 LT1086MK-12 LT1086CT-12 OBSOLETE PACKAGES Consider the T Package for Alternate Source For fixed versions. Consult LTC Marketing for parts specified with wider operating temperature ranges. sn1086 1086ffs 2 U W U U U U U WWW