LTC4241 Datasheet | Linear Technology

.. LTC4241 PCI-Bus with 3.3V Auxiliary Hot Swap Controller Features s s DESCRIPTIO s s s s s s U APPLICATIO S s s Allows Safe Board Insertion and Removal from a Live PCI Slot Controls 3.3V, 5V, - 12V, 12V and 3.3V Auxiliary Supplies Independent 3.3V Auxiliary Supply Hot Swap TM Controller Adjustable Foldback Current Limit with Circuit Breaker Adjustable Supply Voltage Power-Up Rate High Side Drive for External N-Channel FETs - 12V and 12V On-Chip Switches Fault and Power Good Outputs PCI-Based Servers puter Systems The LTC®4241 is a Hot Swap controller that allows a board to be safely inserted and removed from a live PCI-bus slot. It has a primary controller that controls the four PCI supplies and an independent auxiliary controller to control the 3.3V auxiliary supply. External N-channel transistors are used to control the 3.3V, 5V and 3.3V auxiliary supplies while on-chip switches control the - 12V and 12V supplies. The 3.3V, 5V and 3.3V auxiliary supplies can be ramped up at an adjustable rate. Electronic circuit breakers protect all five supplies against overcurrent faults. The foldback current limit feature reduces current spikes and power dissipation when shorts occur. The PWRGD output of the primary controller indicates when all four PCI supplies are within tolerance. The FAULT output indicates an overcurrent condition for any of the five supplies. The LTC4241 is available in the 20-pin narrow SSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. TYPICAL APPLICATIO R1 0.007Ω Q1 IRF7413 R2 0.005Ω Q2 IRF7413 SYSTEM POWER SUPPLY R3 0.07Ω Q3 Si2306DS R5 10Ω C3 10n F R6 10Ω 9 13 14 15 3 3VOUT 17 16 18 11 8 1 2 12 5 R8 10k PCI POWER SYSTEM CONTROLLER RESET 6 R9 10k 7 GND 12VIN VEEIN AUXON ON FAULT PWRGD AUXIN AUXSENSE AUXGATE 3VIN 3VSENSE GATE 5VIN 5VSENSE 5VOUT 12V 500m A - 12V 100m A BACKPLANE CONNECTOR C2 0.1µF LOGIC RESET 4241...