LT1584/LT1585/LT1587 7A, 4.6A, 3A Low Dropout Fast Response Positive Regulators Adjustable and Fixed DESCRIPTIO FEATURES n Fast Transient Response The LT 1584/LT1585/LT1587 are low dropout three- n Guaranteed Dropout Voltage at Multiple Currents terminal regulators with 7A, 4.6A and 3A output current n Load Regulation: 0.05% Typical capability, respectively. Design has been optimized for low n Trimmed Current Limit voltage applications where transient response and mini- n On-Chip Thermal Limiting mum input voltage are critical. Similar to the LT1083/4/5 n Standard 3-Pin Power Package family, it has lower dropout voltage and faster transient response. These improvements make it ideal for low volt- U age microprocessor applications requiring a regulated APPLICATIO S 2.5V to 3.6V output with an input supply below 7V. TM n Pentium Processor Supplies TM Current limit is trimmed to ensure specified output current n PowerPC Supplies and controlled short-circuit current. On-chip thermal lim- n Other 2.5V to 3.6V Microprocessor Supplies iting provides protection against any combination of over- n Low Voltage Logic Supplies load that would create excessive junction temperatures. n Battery-Powered Circuitry n Post Regulator for Switching Supply The LT1585/LT1587 are available in both the through-hole and surface mount versions of the industry standard 3-pin LT1585/7CM, LT1584/5/7CT Adjustable TO-220 power package. The LT1584 is available in the LT1585/7CM-3.3, LT1584/5/7CT-3.3 3.3V Fixed through-hole 3-pin TO-220 power package. LT1585CM-3.38, LT1584/5CT-3.38 3.38V Fixed , LTC and LT are registered trademarks of Linear Technology Corporation. LT1585/7CM-3.45, LT1584/5/7CT-3.45 3.45V Fixed Pentium is a trademark of Intel Corporation. PowerPC is a trademark of IBM Corporation. LT1585/7CM-3.6, LT1584/5/7CT-3.6 3.6V Fixed TYPICAL APPLICATIO Dropout Voltage vs Output Current 1.5 3.3V, 7A, 4.6A, 3A Regulator 1.4 1.3 LT1584-3.3 1.2 3.3V LT1585-3.3 V 4.75V IN 7A, 4.6A, 3A LT1587-3.3 1.1 + + C1 C2* 1.0 10m F SOLID TANTALUM 0.9 0.8 * REQUIRED FOR STABILITY LT1584: C2 = 22m F, 0.7 1585 TA01 LT1585/LT1587: C2 = 10m F 0.6 NOTE: MICROPROCESSOR APPLICATIONS WITH LOAD TRANSIENTS OF 3.8A REQUIRE 0.5 OUTPUT DECOUPLING CAPACITANCE > 1300F ON FIXED VOLTAGE PARTS TO ACHIEVE 0 I < 50mV OF DEVIATION FROM NOMINAL OUTPUT. CONSULT FACTORY FOR DETAILS FULL LOAD OUTPUT CURRENT (A) 1585 TA02 158457a 1 INPUT/OUTPUT DIFFERENTIAL (V) U ULT1584/LT1585/LT1587 ABSOLUTE AXI U RATI GS (Note 1) V ............................................................................. 7V Storage Temperature Range ................. 65C to 150C IN Operating Junction Temperature Range Lead Temperature (Soldering, 10 sec).................. 300C C-Grade PRECONDITIONI G Control Section ................................... 0C to 125C Power Transistor ................................. 0C to 150C 100% Thermal Limit Functional Test I-Grade Control Section ............................... 40C to 125C Power Transistor ............................. 40C to 150C PACKAGE/ORDER INFORMATION ORDER PART ORDER PART NUMBER NUMBER FRONT VIEW FRONT VIEW LT1585CM LT1584CT 3 V IN 3 V LT1587CM LT1585CT IN TAB TAB LT1587CT 2 V IS IS 2 V OUT OUT OUTPUT OUTPUT 1 ADJ 1 ADJ M PACKAGE T PACKAGE 3-LEAD PLASTIC DD 3-LEAD PLASTIC TO-220 = 30C/W* = 50C/W JA JA LT1585CM-3.3 LT1584CT-3.3 LT1585CM-3.38 LT1584IT-3.3 FRONT VIEW LT1585CM-3.45 LT1585CT-3.3 FRONT VIEW LT1585CM-3.6 LT1587CT-3.3 3 V IN 3 V IN LT1587CM-3.3 LT1584CT-3.38 TAB TAB LT1587CM-3.45 LT1585CT-3.38 IS 2 V OUT IS 2 V OUT OUTPUT OUTPUT LT1587CM-3.6 LT1584CT-3.45 1 GND LT1585CT-3.45 1 GND LT1587CT-3.45 M PACKAGE T PACKAGE LT1584CT-3.6 3-LEAD PLASTIC DD 3-LEAD PLASTIC TO-220 = 30C/W* LT1585CT-3.6 JA = 50C/W JA LT1587CT-3.6 * With package soldered to 0.5 square inch copper area over backside Consult LTC Marketing for parts specified with wider operating temperature ranges. ground plane or internal power plane. can vary from 20C/W to JA >40C/W with other mounting techniques. 158457a 2 UUW U U U U WWW