MIC2592B
Micrel
Functional Block Diagram
ON[A/B] AUX[A/B]
VSTBY[A/B]
12VIN[A/B]
Power-on
Reset
250s
VSTBY
UVLO
12VGATE[A/B]
VAUX[A/B]
VAUX Charge
Pump &
Bandgap
Reference
MOSFET
12VSENSE[A/B]
50mV
VREF
VAUX
Overcurrent
3VIN[A/B]
12VBIAS
12VIN[A/B]
12V
UVLO
3VGATE[A/B]
/PWRGD[A/B]
/FAULT[A/B]
3VSENSE[A/B]
50mV
3VIN[A/B]
ON/OFF
100mV*
ON/OFF
Thermal
Shutdown
ON/OFF
100mV*
3V
UVLO
ON/OFF
Overcurrent Detection
VSTBY(REF)
VAUX
PWRGD
IREF
Logic Circuits
Current Mirror
12VPWRGD
12VOUT[A/B]
CFILTER[A/B]
VREF
3VPWRGD
3VOUT[A/B]
/INT
VREF
DIGITAL CORE/SERIAL INTERFACE
VSTBY(REF)
VREF
RFILTER[A&B]
RFILTER[A&B]
OPEN PIN
DETECTOR
40k 3
/FORCE_ON[A/B]
GPI_[A0/B0]
GND
SCL SDA
A2 A1 A0
* MIC2592B-3BTQ fast threshold is 150mV
MIC2592B-5BTQ fast threshold is disabled
Contact factory for availabilty
MIC2592B Block Diagram
March 2005
15
M9999-033105
MICREL [ MICREL SEMICONDUCTOR ]
