LT4180 Virtual Remote Sense Controller Fea T Descrip T n Tight Load Regulation with Highly Resistive Cables The LT 4180 solves the problem of providing tight load without Requiring Remote Sense Wiring regulation over long, highly resistive cables without n Compatible with Isolated and Nonisolated Power requiring an additional pair of remote sense wires. This Supplies Virtual Remote Sense device continuously interrogates n 1% Internal Voltage Reference the line impedance and corrects the power supply output n 5mA Sink Current Capability voltage via its feedback loop to maintain a steady voltage n Soft-Correct Reduces Turn-On Transients at the load regardless of current changes. n Undervoltage and Overvoltage Protection The LT4180 is a full-featured controller with 5mA opto- n Pin-Programmable Dither Frequency isolator sink capability, under/overvoltage lockout, n Optional Spread Spectrum Dither soft-start and a 1% internal voltage reference. The n Wide V Range: 3.1V to 50V IN Virtual Remote Sense feature set includes user-program- n 24-Lead SSOP Package mable dither frequency and optional spread spectrum dither. a T The LT4180 works with any topology and type of isolated n 12V High Intensity Lamps or nonisolated power supply, including DC/DC converters n 28V Industrial Systems and adjustable linear regulators. n High Power (>40 Watts) CAT5 Cable Systems n Wiring Drop Cancellation for Notebook Computer The LT4180 is available in a 24-lead, SSOP package. Battery Charging L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Virtual Remote Sense is a trademark of Linear Technology Corporation. All other trademarks n AC and DC Adaptors are the property of their respective owners. n Well-Logging and Other Remote Instrumentation n Surveillance Equipment Typical a T Isolated Power Supply with Virtual Remote Sense V vs V LOAD WIRE 5.00 CAT5E CABLE R SENSE LINE 4.99 + 4.98 C R L L 4.97 LINE SWITCHING 4.96 REGULATOR V C 4.95 V SENSE DIV0 DIV1 DIV2 SPREAD CHOLD1 CHOLD2 CHOLD3 CHOLD4 IN 4.94 LT4180 DRAIN R OSC 4.93 VIRTUAL REMOTE SENSE COMP C OSC RUN FB OV 4.92 4.91 4180 TA01a 0 0.5 1 1.5 2 2.5 3 V (V) WIRING 4180 TAO1b 4180fb 1 For more information www.linear.com/4180 V (V) LOAD ion pplica ions pplica ion uresLT4180 a Te Maxi Mu M r a T p c F T (Note 1) TOP VIEW V ............................................................. 0.3V to 52V IN SENSE.......................................................V 0.3V to V INTV 1 24 V IN IN IN CC DRAIN 2 23 V INTVCC, RUN, FB, OV, ROSC, OSC, PP COMP 3 22 SENSE DIV0, DIV1, DIV2, SPREAD, CHOLD1, CHOLD1 4 21 RUN CHOLD2, CHOLD3, CHOLD4, DRAIN, COMP, GUARD2 5 20 OV GUARD2, GUARD3, GUARD4, V ............ 0.3V to 5.5V PP CHOLD2 6 19 SPREAD V Pin Current .......................................................10mA IN GUARD3 7 18 DIV0 INTVCC Pin Current .............................................10mA CHOLD3 8 17 DIV1 COSC Pin Current ..................................................3.3mA GUARD4 9 16 DIV2 Maximum Junction Temperature .......................... 125C CHOLD4 10 15 OSC Operating Junction Temperature Range (Note 2) FB 11 14 ROSC E-, I-Grades ....................................... 40C to 125C GND 12 13 COSC MP-Grade .......................................... 55C to 125C GN PACKAGE Storage Temperature Range .................. 65C to 125C 24-LEAD NARROW PLASTIC SSOP T = 150C, = 85C/W JMAX JA o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT4180EGN PBF LT4180EGN TRPBF LT4180GN 24-Lead Narrow Plastic SSOP 40C to 125C LT4180IGN PBF LT4180IGN TRPBF LT4180GN 24-Lead Narrow Plastic SSOP 40C to 125C LT4180MPGN PBF LT4180MPGN TRPBF LT4180GN 24-Lead Narrow Plastic SSOP 55C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: