LTC4227 Dual Ideal Diode and Single Hot Swap Controller FeaT DescripT n Power Path and Inrush Current Control for The LTC 4227 offers ideal diode-OR and Hot Swap Redundant Supplies functions for two power rails by controlling external N- n Low Loss Replacement for Power Schottky Diodes channel MOSFETs. MOSFETs acting as ideal diodes replace n Allows Safe Hot Swapping from a Live Backplane two high power Schottky diodes and the associated heat n 2.9V to 18V Operating Range sinks, saving power and board area. A Hot Swap control n Controls N-Channel MOSFETs MOSFET allows a board to be safely inserted and removed n Limits Peak Fault Current in 1s from a live backplane by limiting inrush current. The supply n 0.5s Ideal Diode Turn-On and Reverse Turn-Off Time output is also protected against short-circuit faults with a n Adjustable Current Limit with Circuit Breaker fast acting current limit and internal timed circuit breaker. n Smooth Switchover without Oscillation The LTC4227 regulates the forward voltage drop across n Adjustable Current Limit Fault Delay the MOSFETs to ensure smooth current transfer from one n Fault and Power Status Output supply to the other without oscillation. The ideal diodes n 20-Lead 4mm 5mm QFN and 16-Lead SSOP Packages turn on quickly to reduce the load voltage droop during supply switchover. If the input supply fails or is shorted, Ta a fast turn-off minimizes reverse-current transients. n Redundant Power Supplies and Supply Holdup The LTC4227 allows turn-on/off control, and reports fault n Computer Systems and Servers and power good status for the supply. n Telecom Networks PART OVERCURRENT FAULT START-UP DELAY 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 LTC4227-1 LATCH OFF 100ms trademarks are the property of their respective owners. LTC4227-2 RETRY 100ms LTC4227-3 LATCH OFF 1.6ms LTC4227-4 RETRY 1.6ms Typical Ta Diode-OR with Hot Swap Application SiR462DP Smooth Supply Switchover 12V 0.1F SiR462DP 0.006 Si7336ADP 12V 12V 7.6A + 0.1F 100F IN1 1V/DIV + 137k CPO1 IN1 DGATE1 CPO2 IN2 DGATE2 SENSE SENSE HGATE OUT IN2 1V/DIV ON I IN1 FAULT 20k 2A/DIV LTC4227 PWRGD I IN2 2A/DIV EN INTV CC D2ON GND TMR 4227 TA01b 4227 TA01a 200ns/DIV 0.1F 0.1F BACKPLANE CARD CONNECTOR CONNECTOR 422712fa 1 For more information www.linear.com/LTC4227 ion pplica ions pplica ion uresLTC4227 Ta e MaxiMMu Tar (Notes 1, 2) Supply Voltages HGATE (Note 4) ..................................... 0.3V to 35V IN1, IN2 .................................................. 0.3V to 24V OUT ....................................................... 0.3V to 24V INTV ..................................................... 0.3V to 7V Average Currents CC Input Voltages FAULT, PWRGD ....................................................5mA ON, EN, D2ON ....................................... 0.3V to 24V INTV .................................................................1mA CC TMR .......................................0.3V to INTV + 0.3V Operating Temperature Range CC + SENSE , SENSE ................................... 0.3V to 24V LTC4227C ................................................ 0C to 70C Output Voltages LTC4227I .............................................40C to 85C FAULT, PWRGD ...................................... 0.3V to 24V Storage Temperature Range .................. 65C to 150C CPO1, CPO2 (Note 3) ............................. 0.3V to 35V Lead Temperature (Soldering, 10 sec) DGATE1, DGATE2 (Note 3) ..................... 0.3V to 35V GN Package ......................................................300C p Fc T TOP VIEW TOP VIEW 20 19 18 17 DGATE1 1 16 CPO1 1 16 NC SENSE SENSE 2 15 HGATE + SENSE 2 15 ON + SENSE 3 14 OUT IN1 3 14 EN IN1 4 13 ON 21 INTV 4 13 TMR CC INTV 5 12 TMR CC GND 5 12 D2ON GND 6 11 D2ON 6 11 FAULT IN2 IN2 7 10 PWRGD 7 8 9 10 DGATE2 8 9 CPO2 GN PACKAGE 16-LEAD PLASTIC SSOP NARROW UFD PACKAGE T = 125C, = 110C/W JMAX JA 20-LEAD (4mm 5mm) PLASTIC QFN T = 125C, = 34C/W JMAX JA EXPOSED PAD (PIN 21) PCB GND CONNECTION OPTIONAL 422712fa 2 For more information www.linear.com/LTC4227 DGATE2 DGATE1 CPO2 CPO1 NC HGATE OUT PWRGD ion igura on in ings bsolu