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FAN50FC3 Datasheet, PDF (7/21 Pages) Fairchild Semiconductor – 8-Bit Programmable, 2- to 3-Phase FastvCore™ Buck Controller
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Electrical Characteristics (Continued)
VCC = 12V, FBRTN = GND, and TA = +25°C. The • denotes specifications which apply over the full operating
temperature range.
Symbol
Parameter
Current-Sense Amplifier (Continued)
Output Voltage Range
ICSCOMP
Output Current
Current Balance Circuit
VSW(x)CM
Common Mode Range(3)
RSW(x)
Input Resistance
ISW(x)
Input Current
ΔISW(x)
Input Current Matching
Current Limit Comparator
VILIMIT
IILIMIT
Output Voltage
Output Current
Maximum Output Current
VCL
Current Limit Threshold Voltage
Current Limit Setting Ratio
Delay Timer
IDELAY
IDELAY(CL)
VDELAY(TH)
Soft-Start
Normal Mode Output Current
Output Current in Current Limit
Threshold Voltage
I(SS)
Output Current
Enable Input
VTH(EN)
VHYS(EN)
IIN(EN)
Threshold Voltage
Threshold Hysteresis
Enable Input Current
tDELAY(EN) Turn-On Delay
#OD Output
VOL(ODB)
Output Voltage LOW
VOH(ODB) Output Voltage HIGH
Power-Good Comparator
VPWRGD(UV)
VPWRGD(OV)
Under-Voltage Threshold
Over-Voltage Threshold
VOL(PWRGD) Output Low Voltage
t1PG(DLY) Power Good Delay Time 1
t2PG(DLY)
t3PG(DLY)
Power Good Delay Time 2
Power Good Delay Time 3(3)
Conditions
Min. Typ. Max. Unit
• 0.05
3.20 V
1
mA
SW(x) = 0V
SW(x) = 0V
SW(x) = 0V
• -600
+200 mV
• 35 50 65 kΩ
• 1.6 3.3 5.0 µA
• -5
+5 %
RILIMT = 143kΩ
RILIMT = 143kΩ
VCSREF − VCSCOMP, RILIMT = 143kΩ
VCL / IILIMT
• 1.6 1.7 1.8 V
12
µA
• 60
µA
• 100 120 140 mV
10
mV/µA
• 12 15 18 µA
• 3.00 3.75 4.50 µA
• 1.6 1.7 1.8 V
During Start-up
• 12 15 18 µA
Start-up sequence, EN>950mV,
CDELAY = 10nF
• 800 850 900 mV
• 80 100 130 mV
1
µA
2
ms
IPWM(SINK) = 400μA
IPWM(SOURCE) = 400μA
•
160 400 mV
•4 5
V
Relative to Nominal DAC Output
• -300 -250 -200 mV
Relative to Nominal DAC Output
• 100 150 200 mV
IPWRGD(SINK) = -4mA
•
Start-up Sequence; CDELAY = 10nF;
Power Good Blanking Time
•
200 300 mV
2
ms
VID Code Changing; CDELAY = 10nF;
Power Good Blanking Time
•
100
250
µs
VID Code Static; CDELAY = 10nF;
Power Good Blanking Time
• 100 200
ns
© 2007 Fairchild Semiconductor Corporation
FAN50FC3 Rev. 1.0.0
7 of 21
www.fairchildsemi.com
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