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LTC4227 Dataheets PDF



Part Number LTC4227
Manufacturers Linear
Logo Linear
Description Dual Ideal Diode and Single Hot Swap Controller
Datasheet LTC4227 DatasheetLTC4227 Datasheet (PDF)

Features n Power Path and Inrush Current Control for Redundant Supplies n Low Loss Replacement for Power Schottky Diodes n Allows Safe Hot Swapping from a Live Backplane n 2.9V to 18V Operating Range n Controls N-Channel MOSFETs n Limits Peak Fault Current in ≤1µs n 0.5µs Ideal Diode Turn-On and Reverse Turn-Off Time n Adjustable Current Limit with Circuit Breaker n Smooth Switchover without Oscillation n Adjustable Current Limit Fault Delay n Fault and Power Status Output n 20-Lead 4.

  LTC4227   LTC4227



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Features n Power Path and Inrush Current Control for Redundant Supplies n Low Loss Replacement for Power Schottky Diodes n Allows Safe Hot Swapping from a Live Backplane n 2.9V to 18V Operating Range n Controls N-Channel MOSFETs n Limits Peak Fault Current in ≤1µs n 0.5µs Ideal Diode Turn-On and Reverse Turn-Off Time n Adjustable Current Limit with Circuit Breaker n Smooth Switchover without Oscillation n Adjustable Current Limit Fault Delay n Fault and Power Status Output n 20-Lead 4mm × 5mm QFN and 16-Lead SSOP Packages Applications n Redundant Power Supplies and Supply Holdup n Computer Systems and Servers n Telecom Networks L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. LTC4227 Dual Ideal Diode and Single Hot Swap Controller Description The LTC®4227 offers ideal diode-OR and Hot Swap™ functions for two power rails by controlling external Nchannel 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 current limit and internal timed circuit breaker. The LTC4227 regulates the forward voltage drop across the MOSFETs to ensure smooth current transfer from one supply to the other without oscillation. The ideal diodes 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. The LTC4227 allows turn-on/off control, and reports fault and power good status for the supply. PART LTC4227-1 LTC4227-2 LTC4227-3 LTC4227-4 OVERCURRENT FAULT LATCH OFF RETRY LATCH OFF RETRY START-UP DELAY 100ms 100ms 1.6ms 1.6ms Typical Application Diode-OR with Hot Swap Application SiR462DP 12V 0.1µF 12V SiR462DP 0.006Ω Si7336ADP + 12V 7.6A 0.1µF 100µF 137k CPO1 IN1 DGATE1 CPO2 ON 20k IN2 DGATE2 SENSE+ SENSE– HGATE OUT LTC4227 FAULT PWRGD BACKPLANE CARD CONNECTOR CONNECTOR EN INTVCC 0.1µF D2ON GND TMR 0.1µF 4227 TA01a For more information www.linear.com/LTC4227 IN1 1V/DIV IN2 1V/DIV IIN1 2A/DIV IIN2 2A/DIV Smooth Supply Switchover 200ns/DIV 4227 TA01b 422712fa 1 LTC4227 Absolute Maximum Ratings (Notes 1, 2) Supply Voltages IN1, IN2................................................... –0.3V to 24V INTVCC...................................................... –0.3V to 7V Input Voltages ON, EN, D2ON ........................................ –0.3V to 24V STMENRS...E.+..,..S..E..N...S..E..–..........................................–..0....3..V...t.o...I.N–T0V.3CVC + 0.3V to 24V Output Voltages FAULT, PWRGD....................................... –0.3V to 24V CPO1, CPO2 (Note 3).............................. –0.3V to 35V DGATE1, DGATE2 (Note 3)...................... –0.3V to 35V HGATE (Note 4)...................................... –0.3V to 35V OUT........................................................ –0.3V to 24V Average Currents FAULT, PWRGD.....................................................5mA INTVCC..................................................................1mA Operating Temperature Range LTC4227C................................................. 0°C to 70°C LTC4227I..............................................–40°C to 85°C Storage Temperature Range................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) GN Package....................................................... 300°C Pin Configuration TOP VIEW DGATE1 CPO1 HGATE OUT SENSE– 1 SENSE+ 2 IN1 3 INTVCC 4 GND 5 IN2 6 20 19 18 17 16 NC 15 ON 21 14 EN 13 TMR 12 D2ON 11 FAULT 7 8 9 10 DGATE2 CPO2 NC PWRGD UFD PACKAGE 20-LEAD (4mm × 5mm) PLASTIC QFN TJMAX = 125°C, θJA = 34°C/W EXPOSED PAD (PIN 21) PCB GND CONNECTION OPTIONAL TOP VIEW DGATE1 SENSE– SENSE+ IN1 INTVCC GND IN2 DGATE2 1 2 3 4 5 6 7 8 16 CPO1 15 HGATE 14 OUT 13 ON 12 TMR 11 D2ON 10 PWRGD 9 CPO2 GN PACKAGE 16-LEAD PLASTIC SSOP NARROW TJMAX = 125°C, θJA = 110°C/W 2 For more information www.linear.com/LTC4227 422712fa LTC4227 Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4227CUFD-1#PBF LTC4227CUFD-1#TRPBF 42271 20-Lead (4mm × 5mm) Plastic QFN 0°C to 70°C LTC4227CUFD-2#PBF LTC4227CUFD-2#TRPBF 42272 20-Lead (4mm × 5mm) Plastic QFN 0°C to 70°C LTC4227CUFD-3#PBF LTC4227CUFD-3#TRPBF 42273 20-Lead (4mm × 5mm) Plastic QFN 0°C to 70°C LTC4227CUFD-4#PBF LTC4227CUFD-4#TRPBF 42274 20-Lead (4mm × 5mm) Plastic QFN 0°C to 70°C LTC4227IUFD-1#PBF LTC4227IUFD-1#TRPBF 42271 20-Lead (4mm × 5mm) Plastic QFN –40°C to 85°C LTC4227IUFD-2#PBF LTC4227IUFD-2#TRP.


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