LTC4242 Datasheet | Linear Technology

.. LTC4242 Dual Slot Hot Swap Controller for PCI Express DESCRIPTIO The LTC®4242 Hot Swap TM controller allows safe board insertion and removal for two independent slots on a PCI Express backplane. External N-channel transistors control the 12V and 3.3V supplies while integrated switches control the 3.3V auxiliary supplies. Both 12V and 3.3V supplies can be ramped up at an adjustable rate. Dual level circuit breakers and fast active current limiting protect all supplies against overcurrent faults. A supply filter at the VCC pin allows the LTC4242 to endure supply transients. The EN input detects the presence of a card in the PCI Express slot. The FAULT and AUXFAULT outputs alert the system of overcurrent conditions on the main and auxiliary supplies, respectively. PGOOD and AUXPGOOD outputs indicate proper main and auxiliary supply outputs. , LT, LTC and LTM 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. Features - - - - - - - - - - - Allows Live Insertion into PCI Express® Backplane Controls Two Independent PCI Express Slots Independent Control of Main and Auxiliary Supplies 20V Rating for 12V Supply Input Pins Integrated 0.25Ω AUX Switches Limits Fault Current in ≤1µs Force On Test Mode Adjustable Supply Voltage Power-Up Rate High Side Drivers for N-Channel MOSFETs Thermal Shutdown Protection Available in 38-Lead QFN and 36-Lead SSOP Packages U APPLICATIO S - - PCI Express-Based PC and Servers Hot Swap Application for Triple Supply Systems TYPICAL APPLICATIO 12V 3.3V PCI Express Application 12VOUT 3.3VOUT 12VIN1 12VSENSE1 12VGATE1 12VOUT1 3VIN1 VCC 3VSENSE1 3VGATE1 3VOUT1 AUXOUT1 3.3VOUT BD_PRST1 ENn 5V/DIV AUXOUTn 5V/DIV 3.3V AUXIN1 AUXON1 ON1 FAULT1 AUXFAULT1 PGOOD1 PGOOD2 AUXFAULT2 FAULT2 ON2 AUXON2 AUXIN2 12VIN2 12VSENSE2 12VGATE2 12VOUT2 3VIN2 PCI EXPRESS HOT PLUG CONTROLLER LTC4242G FON1 EN1...