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FAN5033 Datasheet, PDF (7/39 Pages) Fairchild Semiconductor – 8-Bit Programmable, 2- to 3-Phase, Synchronous Buck Controller
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Electrical Characteristics (Continued)
VCC = 12V, FBRTN = GND, and TA = +25°C. The • denotes specifications that apply over the full operating
temperature range.
Symbol
Parameter
Current Sense Amplifier
VOS(CSA) Offset Voltage
IBIAS(CSSUM) Input Bias Current (for CSSUM)
IBIAS(CSREF) Input Current (for CSREF)
GBW(CSA) Gain Bandwidth Product
Slew Rate
VCSACM Input Common-Mode Range
Output Voltage Range
ICSCOMP Output Current
tOC(DELAY) Current Limit Latch-off Delay Time
Current Balance Circuit
VSW(x)CM Common Mode Range(2)
RSW(x)
Input Resistance
ISW(x)
Input Current
ΔISW(x) Input Current Matching
Current Limit Comparator
VILIMIT
Output Voltage
IILIMIT
Output Current
Maximum Output Current
VCL
Current Limit Threshold Voltage
Current Limit Setting Ratio
Delay Timer
IDELAY
Normal Mode Output Current
IDELAY(CL) Output Current in Current Limit
VDELAY(TH)
Soft-Start
Threshold Voltage
I(SS)
Output Current
Enable Input
VTH(EN) Threshold Voltage
VHYS(EN)
IIN(EN)
Threshold Hysteresis
Enable Input Current
tDELAY(EN) Turn-on Delay
Conditions
Min. Typ. Max. Unit
CSSUM – CSREF
Figure 4
Current drawn by
CSREF Pin
CSSUM = CSCOMP(2)
CCSCOMP = 10pF(2)
CSSUM and CSREF
CDELAY = 10nF
SW(x) = 0V
SW(x) = 0V
SW(x) = 0V
• -1.0
+1.0 mV
• -50
+50 nA
• -3
+3
µA
10
10
•0
• 0.05
1
5
MHz
V/µs
3.2
V
3.2
V
mA
ms
• -600
+200 mV
• 35 50
65
kΩ
• 1.6 3.3 5.0 µA
• -5
+5
%
RILIMT = 143kΩ
• 1.6 1.7 1.8
V
RILIMT = 143kΩ
12
µA
• 60
µA
VCSREF − VCSCOMP, RILIMT
= 143kΩ
•
100
120
140
mV
VCL / IILIMT
10
mV/µA
• 12 15
18
µA
• 3.0 3.75 4.5 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
• 80 100 120 mV
1
µA
2
ms
© 2006 Fairchild Semiconductor 2006
FAN5033 Rev. 1.0.0
7 of 39
www.fairchildsemi.com
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