LTC4242 Dual Slot Hot Swap Controller for PCI Express FEATURES DESCRIPTIO TM Allows Live Insertion into PCI Express Backplane The LTC 4242 Hot Swap controller allows safe board Controls Two Independent PCI Express Slots insertion and removal for two independent slots on a PCI Independent Control of Main and Auxiliary Supplies Express backplane. External N-channel transistors control 20V Rating for 12V Supply Input Pins the 12V and 3.3V supplies while integrated switches control Integrated 0.25 AUX Switches the 3.3V auxiliary supplies. Both 12V and 3.3V supplies Limits Fault Current in 1s can be ramped up at an adjustable rate. Dual level circuit Force On Test Mode breakers and fast active current limiting protect all supplies Adjustable Supply Voltage Power-Up Rate against overcurrent faults. High Side Drivers for N-Channel MOSFETs A supply lter at the V pin allows the LTC4242 to endure CC Thermal Shutdown Protection supply transients. The EN input detects the presence of a Available in 38-Lead QFN and 36-Lead SSOP card in the PCI Express slot. The FAULT and AUXFAULT Packages outputs alert the system of overcurrent conditions on the U main and auxiliary supplies, respectively. PGOOD and APPLICATIO S AUXPGOOD outputs indicate proper main and auxiliary supply outputs. PCI Express-Based PC and Servers , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap Application for Triple Supply Systems Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO PCI Express Application 12V 12V OUT 3.3V 3.3V OUT Normal Power-Up Sequence 12V 12V 12V 12V 3V 3V 3V IN1 SENSE1 GATE1 OUT1 IN1 SENSE1 GATE1 V 3V CC OUT1 ENn 5V/DIV AUXOUT1 3.3V OUT AUXOUTn 3.3V AUXIN1 BD PRST1 5V/DIV AUXON1 ON1 FON1 FAULT1 PCIe PLUG-IN EN1 CONNECTOR CARD 12V AUXFAULT1 OUTn LTC4242G GND 5V/DIV PCI EXPRESS PGOOD1 EN2 HOT PLUG PGOOD2 FON2 3V CONTROLLER OUTn AUXFAULT2 5V/DIV FAULT2 BD PRST2 ON2 AUXON2 AUXOUT2 3.3V OUT PGOODn 3V AUXIN2 OUT2 3.3V 5V/DIV 12V 12V 12V 12V 3V 3V 3V IN2 SENSE2 GATE2 OUT2 IN2 SENSE2 GATE2 4242 F04 10ms/DIV 3.3V 3.3V OUT 12V 12V OUT 4242 TA01a PCIe PLUG-IN CONNECTOR CARD 4242f 1 U ULTC4242 ABSOLUTE AXI U RATI GS (Note 1) Supply Voltages 12V ................................................ 0.3V to 25V GATEn V ........................................................... 0.3V to 7V 12V (Note 3) .. 12V 5V to 12V + 0.3V CC OUTn GATEn GATEn 12V .................................................... 0.3V to 20V AUXOUTn, 3V .............................. 0.3V to 10V INn SENSEn 3V ...................................................... 0.3V to 10V 3V .................................................. 0.3V to 14V INn GATEn AUXINn .................................................. 0.3V to 10V 3V (Note 3) ....... 3V 5V to 3V + 0.3V OUTn GATEn GATEn Input Voltages Operating Temperature Range ONn, AUXONn, FONn ............................... 0.3V to 7V LTC4242C ................................................0C to 70C ENn .......................................................... 0.3V to 7V LTC4242I .............................................40C to 85C Output Voltages Storage Temperature Range FAULTn, PGOODn, AUXFAULTn, SSOP .................................................65C to 150C AUXPGOODn ........................................... 0.3V to 7V QFN ....................................................65C to 125C Analog Voltages Lead Temperature (Soldering, 10 sec) 12V .............................................. 0.3V to 20V SSOP ................................................................300C SENSEn UUW PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW EN1 1 36 FAULT1 2 35 AUXFAULT1 FON1 ON1 3 34 PGOOD1 38 37 36 35 34 33 32 AUXON1 4 33 12V IN1 AUXON1 1 31 12V IN1 5 32 12V 3V 3V 2 30 12V OUT1 SENSE1 OUT1 SENSE1 6 31 12V 3V 3 29 12V 3V GATE1 GATE1 GATE1 GATE1 3V 4 28 12V 3V 7 30 12V SENSE1 OUT1 OUT1 SENSE1 3V 5 27 AUXOUT1 8 AUXOUT1 IN1 3V 29 IN1 AUXIN1 6 26 GND 9 28 GND AUXIN1 39 V 7 25 AUXOUT2 CC V 10 27 AUXOUT2 CC AUXIN2 8 24 12V OUT2 AUXIN2 11 26 12V OUT2 3V 9 23 12V IN2 GATE2 12 25 12V 3V IN2 GATE2 3V 22 12V 10 SENSE2 SENSE2 3V 13 24 12V SENSE2 SENSE2 3V 21 12V 11 GATE2 IN2 3V 14 23 12V GATE2 IN2 3V 12 20 AUXPGOOD2 OUT2 15 22 PGOOD2 3V OUT2 13 14 15 16 17 18 19 16 21 AUXFAULT2 AUXON2 ON2 17 20 FAULT2 18 EN2 FON2 19 UHF PACKAGE G PACKAGE 38-LEAD (5mm 7mm) PLASTIC QFN 36-LEAD PLASTIC SSOP T = 125C, = 34C/W JMAX JA T = 125C, = 95C/W JMAX JA EXPOSED PAD (PIN 39) IS GND, PCB ELECTRICAL CONNECTION OPTIONAL ORDER PART NUMBER ORDER PART NUMBER UHF PART MARKING* LTC4242CG LTC4242CUHF 4242 LTC4242IG LTC4242IUHF 4242 Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: