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LTC1646CGN Datasheet(PDF) 9 Page - Linear Technology |
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LTC1646CGN Datasheet(HTML) 9 Page - Linear Technology |
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9 / 20 page  LTC1646 9 1646fa Hot Circuit Insertion When a circuit board is inserted into a live CompactPCI (CPCI) slot, the supply bypass capacitors on the board can draw huge supply transient currents from the CPCI power bus as they charge up. The transient currents can cause glitches on the power bus, causing other boards in the system to reset. The LTC1646 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 CPCI slot without glitching the system power supplies. The chip also pro- tects the supplies from shorts, precharges the bus I/O pins during insertion and extraction and monitors the supply voltages. BLOCK DIAGRA TIMER 2 3VOUT 7 5VOUT 5 – + +– Q2 Q3 200 µA 13 µA GATE 5VOUT 55mV 150mV VGG 10 5VSENSE 11 5VIN 12 – + +– +– 2.5V UVL – + +– 3VOUT 55mV 150mV CP3 REF 3VSENSE 9 3VIN 8 RESETOUT 1 – + – + +– +– 2.5V UVL Q4 1V CP4 REF – + – + RESETIN 16 PWRGD 4 Q6 FAULT 3 Q7 OFF/ON 15 5 µA 5Vin GND 6 DRIVE 14 PRECHARGE 1646 BD 13 LOGIC Q1 Q5 APPLICATIO S I FOR ATIO The LTC1646 is specifically designed for CPCI applica- tions where the chip resides on the plug-in board. LTC1646 Feature Summary 1. Allows safe board insertion and removal from a CPCI backplane. 2. Controls 5V and 3.3V CPCI supplies. 3. Current limit during power-up: the supplies are allowed to power up in current limit. This allows the chip to power up boards with widely varying capacitive loads without tripping the circuit breaker. The maximum allowable power-up time is programmable using the TIMER pin and an external capacitor. |
Similar Part No. - LTC1646CGN |
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Similar Description - LTC1646CGN |
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