FAN50FC3 Datasheet, PDF (6/21 Pages) Fairchild Semiconductor – 8-Bit Programmable, 2- to 3-Phase FastvCore™ Buck Controller

Electrical Characteristics
V_CC = 12V, FBRTN = GND, and T_A = +25°C. The • denotes specifications which apply over the full operating
temperature range.
Symbol
Parameter
Conditions
Min. Typ. Max. Unit
Error Amplifier
V_COMP
V_FB
Output Voltage Range
Accuracy
V_FB(BOOT) Accuracy
Load Line Droop Accuracy
Differential Non-Linearity
ΔV_FB Line Regulation
I_FB Input Bias Current
I_FBRTN FBRTN Current
I_O(ERR) Output Current
GBW_(ERR) Gain Bandwidth Product
Slew Rate
Relative to nominal DAC output, referenced to
FBRTN. (see Figure 3)
VRM11 VID Range: 1.00625V to 1.60000V
During Start-up
CSREF-CSCOMP= 80mV (see Figure 5)
V_CC =10V to 14V
FB forced to V_OUT -3%
COMP = FB⁽³⁾
COMP = FB⁽³⁾
• 0.5
• ^-7.7
4.0 V
+7.7 mV
• ^{1.0921.1001.108 V}
• -78 -80 -82 mV
• -1
+1 LSB
0.05
%
• 13.5 15 16.5 µA
•
70 95 µA
500
µA
20
MHz
25
V/µs
V_CSCOMP CSCOMP Voltage Range
t_BOOT BOOT Voltage Hold Time
VID Inputs and VIDSEL
Relative to CSREF
C_DELAY = 10nF
• -250
+250 mV
2
ms
V_IL(VID)
V_IH(VID)
V_IL(VID)
V_IH(VID)
I_IN(VID)
t_DLY(VID)
t_DLY(CPU)
Input Low Voltage
Input High Voltage
Select VR10 Table
Select VR11 Table
Input Current, VID Low
VID Transition Delay Time
No CPU Detection Turn-off
Delay Time
VIDx, VIDSEL
VIDx, VIDSEL
VIDSEL Logic LOW
VIDSEL Logic HIGH
VID code change to FB change⁽³⁾
VID code change to off state to PWM going
LOW⁽³⁾
•
0.4 V
• 0.8
3.3 V
0.4 V
0.8
3.3 V
-1
µA
• 200
ns
• 200
ns
Oscillator
f_OSC
f_PHASE
V_RT
Frequency
Frequency Variation
Output Voltage
V_RAMPADJ RAMPADJ Output Voltage
I_RAMPADJ
RAMPADJ Input Current
Range
• 0.25
4.50 MHz
T_A = 25C, R_T= 200K, 3-phase
-20% 400 20% kHz
R_T =100kΩ to GND
• 1.9 2.0 2.1 V
V_RAMPADJ = V_DAC + 2kΩ * (V_CC – V_DAC) / (R_RAMPADJ
+ 2KΩ)
•
-50
+50 mV
1
50 µA
Current-Sense Amplifier
V_OS(CSA) Offset Voltage
I_BIAS(CSSUM)
Input Bias Current
CSSUM)
(for
CSSUM – CSREF (see Figure 4)
• -1.0
• -50
+1.0 mV
+50 nA
I_BIAS(CSREF) Input Current (for CSREF)
GBW_(CSA) Gain Bandwidth Product
Slew Rate
V_CSACM Input Common-Mode Range
Current drawn by CSREF Pin
CSSUM = CSCOMP⁽³⁾
C_CSCOMP = 10pF⁽³⁾
CSSUM and CSREF
• -3
•0
+3 µA
10
MHz
10
V/µs
3.2 V
© 2007 Fairchild Semiconductor Corporation
FAN50FC3 Rev. 1.0.0
6 of 21
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