MIC2580A Hot-Swap PCI Power Controller - Micrel - #2

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MIC2580A Micrel, Inc. MIC2580A 2 February 2005 Pin Configuration 12VOUT 1 3VGATE 3VOUT 3VSENSE 3VIN /PCIRST /LPCIRST /EPWRGD /PWRGD VPCHG 24 12VIN 5VGATE 5VOUT 5VSENSE 5VIN /FAULT CSTART CSLEW /POR CRST 23 22 21 20 19 18 17 16 15 2 3 4 5 6 7 8 9 10 GND 11 /ON M12VIN 12 M12VOUT 14 13 24-lead TSSOP (TS) Pin Description Pin Number Pin Name Pin Function 1 12VOUT +12V Switched Supply (Output): Load carrying output. 2 3VGATE 3.3V Gate Drive (Output): Drives gate of external N-channel MOSFET +3V switch. Adding capacitance will slow the slew rate of the external MOSFET switch turn-on. (The external MOSFET’s gate is charged by an internal current source.) 3 3VOUT +3.3V Output Voltage Sense (Input): Connect to source of external N-channel MOSFET (+3V switched output) to monitor for output undervoltage conditions. 4 3VSENSE +3.3V Current Sense (Input): Measures voltage drop across an external sense resistor with respect to 3VIN for overcurrent detection through the +3.3V switch. 5 3VIN 3V Supply (Input): +3.3V-supply input for current monitoring (reference input for 3VSENSE). Not a load-current carrying input. 6 /PCIRST PCI-Bus Reset (Input): Input from PCI bus that resets the internal logic. Ordering Information Part Number Precharge Temperature Standard Pb-Free Voltage Range Package MIC2580A-1.0BTS MIC2580A-1.0YTS 1V –40°C to +85°C 24-lead TSSOP MIC2580A-1.6BTS MIC2580A-1.6YTS 1.6V –40°C to +85°C 24-lead TSSOP