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LTC1643L Datasheet(PDF) 8 Page - Linear Technology |
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LTC1643L Datasheet(HTML) 8 Page - Linear Technology |
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8 / 16 page  8 LTC1643L/LTC1643L-1/LTC1643H BLOCK DIAGRAM + – LOGIC 9.5V UVL 5VOUT + – 3VOUT 12VIN 50 µA 200 µA Q5 ON/ON FAULT 20 µA 3VSENSE GATE 5VIN 5VSENSE 12VIN 12VOUT VEEIN VEEOUT TIMER GND 12VIN 3VIN 5VOUT 3VOUT 2.5V UVL 2.5V UVL REF REF REF LTC1643H/LTC1643L ONLY LTC1643H/LTC1643L ONLY Q2 Q8 REF 1643 BD CP3 CP4 CP5 CP7 Q3 Q4 5 13 1 16 4 2 15 8 12 11 10 9 3 14 6 7 PWRGD Q7 Q1 Q9 Q10 Q6 APPLICATIONS INFORMATION Hot Circuit Insertion When a circuit board is inserted into a live PCI slot, the supply bypass capacitors on the board can draw huge transient currents from the PCI power bus as they charge up. The transient currents can cause permanent damage to the connector pins and cause glitches on the power bus, causing other boards in the system to reset. The LTC1643 is designed to turn a board’s supply voltages on and off in a controlled manner, allowing the board to be safely inserted or removed from a live PCI slot without glitching the system power supplies. The chip also pro- tects the PCI supplies from shorts and monitors the supply voltages. The LTC1643H is designed for motherboard applica- tions, while the LTC1643L/LTC1643L-1 are designed for CompactPCI applications where the chip resides on the plug-in board. VEEOUT (Pin 15): –12V Supply Output. A 1.2Ω switch is connected between VEEIN and VEEOUT. VEEOUT must exceed –10.8V before the PWRGD signal can go high on the LTC1643H and LTC1643L. 12VOUT (Pin 16): 12V Supply Output. A 0.5Ω switch is connected between 12VIN and 12VOUT. 12VOUT must exceed 11.4V before the PWRGD signal can go high on the LTC1643H and LTC1643L. PIN FUNCTIONS |
Similar Part No. - LTC1643L_15 |
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Similar Description - LTC1643L_15 |
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