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| MIC2591B_05 Datasheet, PDF (16/34 Pages) Micrel Semiconductor – Dual-Slot PCI Express Hot-Plug Controller | |||
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MIC2591B
Function Block Diagram
Micrel
12VSENSE[A/B]
12VIN[A/B]
3VSENSE[A/B]
3VIN[A/B]
CFILTER[A/B]
ON[A/B] AUX[A/B]
Power-on
Reset
250ïs
50mV
50mV
100mV*
ON/OFF
100mV*
ON/OFF
Overcurrent Detection
VSTBY(REF)
IREF
Current Mirror
12V
UVLO
3V
UVLO
ON/OFF
VREF
VSTBY[A/B]
12VIN[A/B]
VSTBY
UVLO
Bandgap
Reference
VREF
VAUX Charge
Pump &
MOSFET
VAUX
Overcurrent
3VIN[A/B]
12VBIAS
ON/OFF
Thermal
Shutdown
Logic Circuits
VAUX
PWRGD
3VPWRGD
VREF
12VPWRGD
VREF
12VGATE[A/B]
VAUX[A/B]
3VGATE[A/B]
/PWRGD[A/B]
/FAULT[A/B]
3VOUT[A/B]
12VOUT[A/B]
/INT
RFILTER[A&B]
/FORCE_ON[A/B]
GND
GPI_[A0/B0]
RFILTER[A&B]
OPEN PIN
DETECTOR
MUX &
12 Channel, 8-bit
A/D Converter
DIGITAL CORE/SERIAL INTERFACE
VAUX
FULL-SCALE
CURRENT
REFERENCE
VSTBY(REF)
40kï ï´ 3
* MIC2591B-3BTQ fast threshold is 150mV
MIC2591B-5BTQ fast threshold is disabled
Contact factory for availabilty
SCL SDA
A2 A1 A0
MIC2591B Block Diagram
IREF
March 2005
16
M9999-033105
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