MIC2778 Micrel Semiconductor, MIC2778 Datasheet - Page 15

• Manufacturer Part Number: MIC2778
• Description: Mic2778 Voltage Monitor With Adjustable Hysteresis
• Manufacturer: Micrel Semiconductor

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