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LTC1643AH Datasheet(PDF) 1 Page - Linear Technology |
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LTC1643AH Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LTC1643AL LTC1643AL-1/LTC1643AH 1643afa PCI-Bus Hot Swap Controller Hot Swappable PCI Supply s Allows Safe Board Insertion and Removal from a Live PCI Slot s Works on either a Motherboard (LTC1643AH) or CompactPCI TM Card (LTC1643AL/LTC1643AL-1) s Controls –12V, 3.3V, 5V, 12V Supplies s Programmable Foldback Current Limit with Circuit Breaker s User-Programmable Supply Voltage Power-Up Rate s High Side Drive for External N-Channel MOSFETs s –12V and 12V On-Chip Switches s Fault and Power-Good Outputs s Available in a Narrow 16-Lead SSOP Package The LTC ®1643AisaHotSwapTMcontrollerthatallowsaboard 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 program- mable rate. An electronic circuit breaker protects all four suppliesagainstovercurrentfaults.Thefoldbackcurrentlimit 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(LTC1643AH)/ON (LTC1643AL/ LTC1643AL-1) pin is used to cycle the board power or reset the circuit breaker. The LTC1643AL-1 has the ±12V power good comparators disabled. The LTC1643A is available in a 16-pin narrow SSOP package. s PCI-Based Servers s CompactPCI Compliant Boards , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. CompactPCI is a trademark of PCI Industrial Computer Manufacturing Group. FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATION R2 0.005 Ω Q2 IRF7413 Q1 IRF7413 R1 0.007 Ω R5 10 Ω R6 10 Ω R7 100 Ω C1 0.047 µF 5V 5A 3.3V 7.6A GND –12V 100mA 12V 500mA R3 10k R4 10k 11 3 13 12 14 16 15 4 10 9 8 1 2 5 6 7 3VIN GND 12VIN VEEIN ON FAULT PWRGD 3VSENSE 5VSENSE 3VOUT LTC1643AH 5VOUT 12VOUT VEEOUT TIMER 5VIN GATE 1643A TA01 SYSTEM POWER SUPPLY PCI POWER SYSTEM CONTROLLER C2 0.1 µF RESET LOGIC RESET |
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