LTC4212 Hot Swap Controller with Power-Up Timeout DESCRIPTIO FEATURES TM n Allows Safe Board Insertion and Removal The LTC 4212 is a Hot Swap controller that allows a from a Live Backplane board to be safely inserted and removed from a live n Controls Supply Voltages from 2.5V to 16.5V backplane. An internal high side switch driver controls the n Adjustable Soft-Start with Inrush Current gate of an external N-channel MOSFET for supply voltages Limiting ranging from 2.5V to 16.5V. The LTC4212 provides soft- n Fast Turn-Off Time start and inrush current limiting during the start-up n No External Gate Capacitor is Required period. It features a power-up timeout circuit that discon- n Power Good Input with Adjustable Timer and nects the system supply when the onboard supplies do not Glitch Filter enter into regulation within an adjustable timeout period. n Power-Up Timeout Circuit Interfaces with External The controller interfaces with external supply monitor ICs Supply Monitors or directly with the PGOOD pin of a DC/DC converter. After n Dual Level Overcurrent Fault Protection normal power-up, a programmable power good glitch n Automatic Retry or Latched Mode Operation filter can be enabled to filter out short term dips in the n High Side Drive for an External N-Channel FET supplies. n MS10 Package Two current limit comparators provide dual level overcurrent circuit breaker protection. The slow com- U APPLICATIO S parator trips at V 50mV and activates in 18s. The fast CC comparator trips at V 150mV and typically responds CC n Electronic Circuit Breaker in 500ns. n Hot Board Insertion and Removal n The LTC4212 can be configured for both latchoff and Self-Isolating Hot Swap Boards autoretry applications and is available in a 10-pin MSOP , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. package. TYPICAL APPLICATIO Hot Swap Controller with Power Good Function BACKPLANE EDGE CONNECTOR CONNECTOR (FEMALE) (MALE) 0.007 Si4410DY Power-Up Waveforms V CC 5V 5V + 10 2.5V Z1 LT1963-2.5 10F ON + + 1.5A 5V/DIV 10F 10F 100nF TIMER 10k V SENSE GATE CC 1V/DIV 3.3V ON LT1963-3.3 + + 1.5A 10k 10k 20k 10F 10F LTC4212 PGT FAULT FAULT PGI 10k 1V/DIV GND V V TIMER PGT PGF CCA CC3 LTC1727-2.5 PGI 2.1k COMP2.5 V CC25 5V/DIV COMP3 0.01F 4.7nF 270pF COMP A GND 5ms/DIV 4212 TA01a GND Z1 = SMAJ10A (TVS) 4212f 1 U ULTC4212 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) ORDER PART Supply Voltage (V ) ............................................... 17V CC NUMBER TOP VIEW Input Voltages ON 1 10 FAULT LTC4212CMS ON, PGI ................................................ 0.3V to 17V TIMER 2 9 V CC PGT 3 8 SENSE LTC4212IMS SENSE .................................... 0.3V to (V + 0.3V) PGF 4 7 GATE CC GND 5 6 PGI TIMER, PGT, PGF ....................................0.3V to 2V MS PACKAGE Output Voltages 10-LEAD PLASTIC MSOP GATE ............................... Internally Limited (Note 3) MS PART T = 125C, = 200C/ W JMAX JA FAULT .................................................. 0.3V to 17V MARKING Operating Temperature Range LTC5 LTC4212C .............................................. 0C to 70C LTC6 LTC4212I........................................... 40C to 85C Storage Temperature Range ................. 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25C. V = 5V, unless otherwise noted. (Note 2) A CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V V Supply Voltage Range l 2.5 16.5 V CC CC I V Supply Current ON = High, TIMER = Low l 1 1.5 mA CC CC V Internal V Undervoltage Lockout V Low-to-High Transition l 2.13 2.34 2.47 V LKO CC CC V V Undervoltage Lockout Hysteresis 110 mV LKOHST CC I ON Input Current V = V or GND 1 10 A INON ON CC I FAULT Leakage Current V = 15V, Pull-Down Device Off l 0.1 2.5 A LEAK FAULT I PGI Pin Input Current V = V or GND 1 10 A INPGI PGI CC I SENSE Input Current V = V or GND 1 10 A INSENSE SENSE CC V SENSE Trip Voltage (V V ) Fast Comparator Trips l 130 150 170 mV CB(FAST) CC SENSE V SENSE Trip Voltage (V V ) Slow Comparator Trips l 40 50 60 mV CB(SLOW) CC SENSE I GATE Pull-Up Current Charge Pump On, V 0.2V l 12.5 10 7.5 A GATEUP GATE I Normal GATE Pull-Down Current ON Low l 130 200 270 A GATEDOWN Fast GATE Pull-Down Current FAULT Latched and Circuit Breaker 50 mA Tripped or in UVLO, V = 15V GATE V External N-Channel Gate Drive V V (For V = 2.5V) l 4.0 8 V GATE GATE CC CC V V (For V = 2.7V) l 4.5 8 V GATE CC CC V V (For V = 3.3V) l 5.0 10 V GATE CC CC V V (For V = 5V) l 10 16 V GATE CC CC V V (For V = 12V) l 10 18 V GATE CC CC V V (For V = 15V), (Note 3) l815 V GATE CC CC V GATE Overvoltage Lockout Threshold l 0.08 0.2 0.3 V GATEOV V ON Threshold High l 1.23 1.316 1.39 V ONHI V ON Threshold Low l 0.4 0.455 0.5 V ONLO V Power Good Input Threshold l 1.20 1.236 1.26 V PGI V Power Good Input Hysterisis 28 mV PGIHST 4212f 2 U WWW