LTC1643L Datasheet | Linear Technology

LTC1643L/LTC1643L-1/LTC1643H PCI-Bus Hot Swap Controller Features s s DESCRIPTIO s s s s s s Allows Safe Board Insertion and Removal from a Live PCI Slot Works on either a Motherboard (LTC1643H) or pact PCITM Card (LTC1643L/LTC1643L-1) Controls - 12V, 3.3V, 5V, 12V Supplies Programmable Foldback Current Limit with Circuit Breaker User-Programmable Supply Voltage Power-Up Rate High Side Drive for External N-Channels - 12V and 12V On-Chip Switches Fault and Power-Good Outputs U APPLICATIO S s s PCI-Based Servers pact PCI pliant Boards , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. pact PCI is a trademark of PCI Industrial puter Manufacturing Group. The LTC®1643 is a Hot Swap TM controller that allows a board to be safely inserted and removed from a live PCI-Bus slot. Two external N-channel transistors control the 3.3V and 5V supplies while on-chip switches control the - 12V and 12V supplies. All supply voltages can be ramped up at a programmable rate. An electronic circuit breaker protects all four supplies against overcurrent faults. The foldback current limit feature limits current spikes and power dissipation when shorts occur and allows boards with large capacitances to be powered up without tripping the circuit breaker. The PWRGD output indicates when all of the supply voltages are within tolerance and the FAULT output indicates an overcurrent condition. The ON(LTC1643H)/ON (LTC1643L/LTC1643L-1) pin is used to cycle the board power or reset the circuit breaker. The LTC1643L-1 has the ± 12V power good parators disabled. The LTC1643 is available in a 16-pin narrow SSOP package. TYPICAL APPLICATION Hot Swappable PCI Supply R1 0.007Ω Q1 IRF7413 R2 0.005Ω Q2 IRF7413 R6 10Ω SYSTEM POWER SUPPLY 9 3VIN GND 1 12VIN 2 VEEIN 5 ON 8 PCI POWER SYSTEM CONTROLLER RESET R3 10k R4 10k 6 10 R5 10Ω 11 3 13 12 5VSENSE 14 5VOUT R7 100Ω C1 0.047µF 3VSENSE GATE 3VOUT...