LTC4236 Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor Fea T Descrip T n Ideal Diode-OR and Inrush Current Control for The LTC 4236 offers ideal diode-OR and Hot Swap func- Redundant Supplies tions for two power rails by controlling external N-channel n MOSFETs. MOSFETs acting as ideal diodes replace two Low Loss Replacement for Power Schottky Diodes n high power Schottky diodes and the associated heat sinks, Enables Safe Board Insertion into a Live Backplane n saving power and board area. A Hot Swap control MOSFET 2.9V to 18V Operating Range n allows a board to be safely inserted and removed from a Current Monitor Output n live backplane by limiting inrush current. The supply output Controls N-Channel MOSFETs is also protected against short-circuit faults with a fast n Limits Peak Fault Current in 1s acting foldback current limit and electronic circuit breaker. n Adjustable Current Limit with Foldback n Adjustable Start-Up and Current Limit Fault Delay The LTC4236 regulates the forward voltage drop across n 0.5s Ideal Diode Turn-On and Turn-Off Time the ideal diode MOSFETs to ensure smooth current transfer n Smooth Switchover without Oscillation from one supply to the other without oscillation. The ideal n Fault, Power Good and Diode Status Outputs diode MOSFETs turn on quickly to reduce the load voltage n LTC4236-1: Latch Off After Fault droop during supply switchover. If the input supply fails n LTC4236-2: Automatic Retry After Fault or is shorted, a fast turn-off minimizes reverse current n 28-Pin 4mm x 5mm QFN Package transients. A current sense amplifier translates the voltage across the sense resistor to a ground referenced signal. The LTC4236 a T provides adjustable start-up delay, turn-on/-off control, n Redundant Power Supplies and reports fault and power good status for the supply. n High Availability Systems and Servers L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n Technology Corporation. All other trademarks are the property of their respective owners. Telecom and Network Infrastructure Protected by U.S. Patents, including 7920013, 8022679. Typical a T Ideal Diode-OR with Hot Swap Application Smooth Supply Switchover SiR158DP 12V IN2 0.1F SiR158DP 0.003 SiR158DP 12V IN1 12V 7A + IN1 1V/DIV 0.1F 0.1F C LOAD IN2 1V/DIV + + 13.7k CPO1 IN1 DGATE1 CPO2 D2SRC IN2 DGATE2 REG SENSE CS SENSE HGATE OUT 15k I IN1 ON FB 2A/DIV 2k 2k I IN2 2A/DIV LTC4236 FAULT PWRGD 4236 TA01b DSTAT1 EN 200ms/DIV DSTAT2 IMON ADC INTV CC GND D2OFF DTMR FTMR 0.1F 0.1F 0.1F 4236 TA01a 4236f 1 For more information www.linear.com/LTC4236 ion pplica ions pplica ion uresLTC4236 a T e Maxi Mu M r a T p c F T (Notes 1, 2) Supply Voltages TOP VIEW IN1, IN2 .................................................. 0.3V to 24V INTV ..................................................... 0.3V to 7V CC + + REG ...........................SENSE 5V to SENSE + 0.3V 28 27 26 25 24 23 Input Voltages SENSE 1 22 FAULT + ON, D2OFF, EN ...................................... 0.3V to 24V SENSE 2 21 DSTAT1 + CS 3 20 DSTAT2 FTMR, DTMR .........................0.3V to INTV + 0.3V CC IN1 4 19 ON FB ............................................................ 0.3V to 7V 29 INTV 5 18 D2OFF + + CC SENSE , SENSE , CS , D2SRC .............. 0.3V to 24V GND 6 17 NC Output Voltages IN2 7 16 NC IMON ....................................................... 0.3V to 7V D2SRC 8 15 REG FAULT, PWRGD, DSTAT1, DSTAT2 ........... 0.3V to 24V 9 10 11 12 13 14 CPO1, CPO2 (Notes 3, 4) ....................... 0.3V to 35V DGATE1, DGATE2 (Notes 3, 4) ............... 0.3V to 35V UFD PACKAGE HGATE (Note 5) ..................................... 0.3V to 35V 28-LEAD (4mm 5mm) PLASTIC QFN T = 125C, = 43C/W (NOTE 6) OUT ....................................................... 0.3V to 24V JMAX JA EXPOSED PAD (PIN 29) PCB GND CONNECTION OPTIONAL Average Currents FAULT, PWRGD, DSTAT1, DSTAT2 .........................5mA INTV ...............................................................10mA CC Operating Ambient Temperature Range LTC4236C ................................................ 0C to 70C LTC4236I .............................................40C to 85C Storage Temperature Range .................. 65C to 150C o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4236CUFD-1 PBF LTC4236CUFD-1 TRPBF 42361 28-Lead (4mm x 5mm) Plastic QFN 0C to 70C LTC4236CUFD-2 PBF LTC4236CUFD-2 TRPBF 42362 28-Lead (4mm x 5mm) Plastic QFN 0C to 70C LTC4236IUFD-1 PBF LTC4236IUFD-1 TRPBF 42361 28-Lead (4mm x 5mm) Plastic QFN 40C to 85C LTC4236IUFD-2 PBF LTC4236IUFD-2 TRPBF 42362 28-Lead (4mm x 5mm) Plastic QFN 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: