MIC2591B Dual-Slot PCI Express Hot-Plug Controller - Micrel - #2

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MIC2591B Micrel March 2005 2 M9999-033105 Typical Application System Power Supply PCI Express Connector +12V +3.3V VSTBY VSTBYA VSTBYB VAUXA 12VINA 12VSENSEA 3VINA 3VSENSEA 12VINB 12VSENSEB 3VINB 3VSENSEB 12VGATEA 12VOUTA 3VGATEA 3VOUTA 3VGATEB 3VOUTB VAUXB GND GND A1 A2 A0 ONB ONA GPI_B0 GPI_A0 /FORCE_ONB /FORCE_ONA AUXENB AUXENA /INT SCL SDA 12VGATEB 12VOUTB RFILTER[A&B] CFILTERA CFILTERB MIC2591B #CGS 22nF *R12VGATEA 15ƒÇ Si4435DY Si4420DY #CGATE 22nF #CMILLER 6800pF 15ƒÇ RSENSE 0.020ƒÇ PCI Express Bus 3.3AUX 375mA 3.3V 3.0A 12V 2.1A (x4/x8) RSENSE 0.020ƒÇ #CGS 22nF *R12VGATEB 15ƒÇ #CMILLER Si4435DY 6800pF RSENSE 0.013ƒÇ Si4420DY #CGATE 22nF *R3VGATEB RSENSE 0.013ƒÇ PCI Express Connector PCI Express Bus 3.3AUX 375mA 3.3V 3.0A 12V 2.1A (x4/x8) * Values for R12VGATE[A/B] and R3VGATE[A/B] may vary depending upon the CGS of the external MOSFETs. # These components are not required for MIC2591B operation but can be implemented for GATE output slew rate control (application specific) ¥ Bold lines indicate high current paths 4 9 2 11 26 5 8 3 10 12 13 14 16 32 29 34 27 25 24 23 21 22 17 46 15 15ƒÇ *R3VGATEA 0.1ìF 0.1ìF 0.1ƒÝF 0.1ƒÝF 0.1ƒÝF 0.1ƒÝF /FAULTB /FAULTA /PWRGDB /PWRGDA 1 ONB ONA AUXENB AUXENA /INT SCL SDA 110kƒÇ 1% Hot-Plug Controller SMBus I/O Management Controller 48 47 37 43 42 38 28 35 20 45 44 VSTBY C1 C2 VSTBY 10k x 3 10k x 4 SDA SCL /INT SMBus Base Address 39 40 41 GPI_B0 100k 100k 100k 100k GPI_A0 VSTBY /FORCE_ONB /FORCE_ONA /FAULTB /FAULTA /PWRGDB /PWRGDA 36 31 6 VSTBY 10k x 4 33 IREF 23.2k 1%