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LTC4242 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4242 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LTC4242 1 4242f Dual Slot Hot Swap Controller for PCI Express The LTC ®4242 Hot SwapTM 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. ■ PCI Express-Based PC and Servers ■ Hot Swap Application for Triple Supply Systems ■ 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 0.25 Ω 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 APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATIO , 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. PCI Express Application Normal Power-Up Sequence 3VSENSE1 3VGATE1 3VIN1 4242 TA01a PCIe CONNECTOR PLUG-IN CARD PCIe CONNECTOR PLUG-IN CARD 3.3VOUT 3.3VOUT 12VOUT 3VOUT1 3VOUT2 12VSENSE1 12VGATE1 12VIN1 VCC AUXIN1 AUXOUT1 FON1 EN1 GND EN2 FON2 3.3V 3.3V 12V AUXOUT2 3.3V AUXON1 ON1 FAULT1 AUXFAULT1 PGOOD1 PGOOD2 AUXFAULT2 FAULT2 ON2 AUXON2 12V 3.3V 12VOUT1 3VSENSE2 3VGATE2 3VIN2 LTC4242G 12VSENSE2 12VGATE2 12VIN2 12VOUT2 BD_PRST1 12VOUT 3.3VOUT 3.3VOUT BD_PRST2 PCI EXPRESS HOT PLUG CONTROLLER AUXIN2 AUXOUTn 5V/DIV 12VOUTn 5V/DIV 3VOUTn 5V/DIV PGOODn 5V/DIV 10ms/DIV 4242 F04 ENn 5V/DIV |
Similar Part No. - LTC4242 |
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Similar Description - LTC4242 |
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