FAN5182_08 Datasheet, PDF (5/19 Pages) Fairchild Semiconductor – Adjustable Output, 1-, 2-, or 3-Phase Synchronous Buck Controller

Electrical Characteristics
VCC = 12V, FBRTN = GND, • indicates specifications over operating ambient temperature range.⁽²⁾
Symbol
Parameter
Conditions
Min. Typ. Max. Units
Oscillator
fOSC Frequency Range
TPHASE Frequency Variation
• 0.25
3.00 MHz
RT = 332kΩ, 3-phase
• 155 200 245
TA = 25°C, RT = 154kΩ, 3-phase • 155 400 245 kHz
TA = 25°C, RT = 100kΩ, 3-phase • 155 600 245
VRT Output Voltage
RT = 100kΩ to GND
•
2.0
V
VRAMPADJ RAMPADJ Output Voltage
RAMPADJ - FB - 2KΩ x IRAMPADJ
(with IRAMPADJ set to 20µA)
•
-50
IRAMPADJ RAMPADJ Input Current Range⁽³⁾
0
+50 mV
100 µA
Voltage Error Amplifier
VOL Output Voltage Low
0.3
V
VOH Output Voltage High
VFB Accuracy (Referenced to FBRTN) FAN5182_NA3E229
3.1
V
1% • 792 800 808 mV
IFB
Input Bias Current
FB = 800mV
• -4
±1
+4
µA
ΔVFB Line Regulation
VCC = 10V to 14V
0.05
%
IFBRTN FBRTN Current
•
100 140 µA
IO(ERR)
GBW(ERR)
Output Current
DC Gain⁽³⁾
Gain Bandwidth Product⁽³⁾
Slew Rate⁽³⁾
FB forced to VOUT - 3%
COMP = FB
CCOMP = 10pF
500
µA
87
dB
20
MHz
10
V/µs
Current-Sense Amplifier
VOS(CSA) Offset Voltage
CSSUM-CSREF (See Figure 3) • -5.5
+5.5 mV
IBIAS(CSSUM) Input Bias Current
DC Gain⁽³⁾
GBW(CSA) Gain Bandwidth Product⁽³⁾
Slew Rate⁽³⁾
CCSCOMP = 10pF
• -50
+50 nA
70
dB
10
MHz
10
V/µs
Input Common-Mode Range
VOL Output Voltage Low
CSSUM & CSREF
0
VCC-2.5 V
0.1
V
VOH Output Voltage High
VCC-2.5
V
ICSCOMP Output Current
500
µA
Current-Balance Circuit
VSW(X)CM Common-Mode Range⁽³⁾
-600
+200 mV
Rsw(X) Input Resistance
SW(X) = 0V
• 20 30 40 kΩ
ISW(X)
ΔISW(X)
Input Current
Input Current Matching
SW(X) = 0V
SW(X) = 0V
•4
7
10 µA
• -7
+7
%
ΔVOS Match
Offset Voltage Matching
(Difference between phases)
FAN5182_NA3E229
8
mV
© 2005 Fairchild Semiconductor Corporation
FAN5182 • Rev. 1.1.3
5
www.fairchildsemi.com