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LTC4236 Dataheets PDF



Part Number LTC4236
Manufacturers Linear
Logo Linear
Description Dual Ideal Diode-OR and Single Hot Swap Controller
Datasheet LTC4236 DatasheetLTC4236 Datasheet (PDF)

Features nn Ideal Diode-OR and Inrush Current Control for Redundant Supplies nn Low Loss Replacement for Power Schottky Diodes nn Enables Safe Board Insertion into a Live Backplane nn 2.9V to 18V Operating Range nn Current Monitor Output nn Controls N-Channel MOSFETs nn Limits Peak Fault Current in ≤ 1µs nn Adjustable Current Limit with Foldback nn Adjustable Start-Up and Current Limit Fault Delay nn 0.5µs Ideal Diode Turn-On and Turn-Off Time nn Smooth Switchover without Oscillation nn Fault, P.

  LTC4236   LTC4236


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Features nn Ideal Diode-OR and Inrush Current Control for Redundant Supplies nn Low Loss Replacement for Power Schottky Diodes nn Enables Safe Board Insertion into a Live Backplane nn 2.9V to 18V Operating Range nn Current Monitor Output nn Controls N-Channel MOSFETs nn Limits Peak Fault Current in ≤ 1µs nn Adjustable Current Limit with Foldback nn Adjustable Start-Up and Current Limit Fault Delay nn 0.5µs Ideal Diode Turn-On and Turn-Off Time nn Smooth Switchover without Oscillation nn Fault, Power Good and Diode Status Outputs nn LTC4236-1: Latch Off After Fault nn LTC4236-2: Automatic Retry After Fault nn 28-Pin 4mm x 5mm QFN Package Applications nn Redundant Power Supplies nn High Availability Systems and Servers nn Telecom and Network Infrastructure LTC4236 Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor Description The LTC®4236 offers ideal diode-OR and Hot Swap functions for two power rails by controlling external N-channel MOSFETs. MOSFETs acting as ideal diodes replace two high power Schottky diodes and the associated heat sinks, saving power and board area. A Hot Swap control MOSFET allows a board to be safely inserted and removed from a live backplane by limiting inrush current. The supply output is also protected against short-circuit faults with a fast acting foldback current limit and electronic circuit breaker. The LTC4236 regulates the forward voltage drop across the ideal diode MOSFETs to ensure smooth current transfer from one supply to the other without oscillation. The ideal diode MOSFETs turn on quickly to reduce the load voltage droop during supply switchover. If the input supply fails or is shorted, a fast turn-off minimizes reverse current transients. A current sense amplifier translates the voltage across the sense resistor to a ground referenced signal. The LTC4236 provides adjustable start-up delay, turn-on/-off control, and reports fault and power good status for the supply. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7920013, 8022679. Typical Application 12V 0.1µF 12V Ideal Diode-OR with Hot Swap Application SiR158DP 0.1µF SiR158DP 0.1µF 0.003Ω SiR158DP 13.7k CPO1 IN1 DGATE1 CPO2 D2SRC IN2 DGATE2 REG SENSE+ CS+ SENSE– HGATE OUT ON FB 2k EN INTVCC GND 0.1µF LTC4236 D2OFF DTMR 0.1µF FAULT PWRGD DSTAT1 DSTAT2 FTMR IMON 0.1µF + 12V IN1 7A 1V/DIV CLOAD IN2 1V/DIV 15k IIN1 2A/DIV 2k IIN2 2A/DIV ADC 4236 TA01a For more information www.linear.com/LTC4236 Smooth Supply Switchover IN2 IN1 200ms/DIV 4236 TA01b 4236f 1 LTC4236 Absolute Maximum Ratings (Notes 1, 2) Supply Voltages IN1, IN2................................................... –0.3V to 24V INTVCC...................................................... –0.3V to 7V REG............................SENSE+ – 5V to SENSE+ + 0.3V Input Voltages ON, D2OFF, EN ....................................... –0.3V to 24V FTMR, DTMR..........................–0.3V to INTVCC + 0.3V FB............................................................. –0.3V to 7V SENSE+, SENSE–, CS+, D2SRC............... –0.3V to 24V Output Voltages IMON........................................................ –0.3V to 7V FAULT, PWRGD, DSTAT1, DSTAT2............ –0.3V to 24V CPO1, CPO2 (Notes 3, 4)........................ –0.3V to 35V DGATE1, DGATE2 (Notes 3, 4)................ –0.3V to 35V HGATE (Note 5)...................................... –0.3V to 35V OUT........................................................ –0.3V to 24V Average Currents FAULT, PWRGD, DSTAT1, DSTAT2..........................5mA INTVCC................................................................10mA Operating Ambient Temperature Range LTC4236C................................................. 0°C to 70°C LTC4236I..............................................–40°C to 85°C Storage Temperature Range................... –65°C to 150°C Pin Configuration TOP VIEW DGATE1 CPO1 HGATE OUT FB PWRGD 28 27 26 25 24 23 SENSE– 1 22 FAULT SENSE+ 2 21 DSTAT1 CS+ 3 20 DSTAT2 IN1 4 INTVCC 5 GND 6 29 19 ON 18 D2OFF 17 NC IN2 7 16 NC D2SRC 8 15 REG 9 10 11 12 13 14 DGATE2 CPO2 DTMR FTMR EN IMON UFD PACKAGE 28-LEAD (4mm × 5mm) PLASTIC QFN TJMAX = 125°C, θJA = 43°C/W (NOTE 6) EXPOSED PAD (PIN 29) PCB GND CONNECTION OPTIONAL Order Information 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 0°C to 70°C LTC4236CUFD-2#PBF LTC4236CUFD-2#TRPBF 42362 28-Lead (4mm x 5mm) Plastic QFN 0°C to 70°C LTC4236IUFD-1#PBF LTC4236IUFD-1#TRPBF 42361 28-Lead (4mm x 5mm) Plastic QFN –40°C to 85°C LTC4236IUFD-2#PBF LTC4236IUFD-2#TRPBF 42362 28-Lead (4mm x 5mm) Plastic QFN –40°C to 85°C Consult.


LTC4235 LTC4236 VHK-03200A01-H150


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