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FAN5099 Datasheet(PDF) 5 Page - Fairchild Semiconductor

Part No. FAN5099
Description  Wide Frequency Synchronous Buck PWM AND LDO Controller
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5099 Datasheet(HTML) 5 Page - Fairchild Semiconductor

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© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5099 Rev. 1.1.3
5
Electrical Characteristics
Unless otherwise noted, VCC = 5V, TA = 25°C, using the circuit in Figure 1. The ‘•’ denotes that the specifications apply
to the full ambient operating temperature range.(4,5)
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
Supply Current
IVCC
VCC Current (Quiescent)
HDRV, LDRV Open
2.6
3.2
3.8
mA
IVCC(SD)
VCC Current (Shutdown)
EN = 0V, VCC = 5.5V
200
400
μA
IVCC(OP)
VCC Current (Operating)
EN = 5V, VCC = 5.0V,
QFET = 20nC, FSW = 200kHz
10
15
mA
VSHUNT
VCC Voltage(6)
Sinking 1mA to 100mA at VCC Pin
5.4
5.9
V
Under-Voltage Lockout (UVLO)
UVLO(H)
Rising VCC UVLO Threshold
4.00
4.25
4.50
V
UVLO(L)
Falling VCC UVLO Threshold
3.60
3.75
4.00
V
VCC UVLO Threshold
Hysteresis
0.5
V
Soft-Start
ISS
Current
10
μA
VLDOSTART LDO Start Threshold
2.2
V
VSSOK
PWM Protection Enable
Threshold
1.2
V
Oscillator
FOSC
Frequency
R(T) = 25.5K
Ω ± 1%
240
300
360
kHz
R(T) = 199K
Ω ± 1%
60
80
100
kHz
R(T) = Open
50
kHz
Operating Frequency Range
40
600
kHz
ΔVRAMP Ramp Amplitude
(Peak-to-Peak)
R(RAMP) = 330K
Ω
0.4
V
Minimum On Time
f = 200kHz
200
ns
Reference
VREF
Reference Voltage
(Measured at FB Pin)
TA = 0°C to 70°C
790
800
810
mV
TA = -40°C to 85°C
788
800
812
mV
Current Amplifier Reference
(at SW node)
160
mV
Error Amplifier
DC Gain
80
dB
GBWP
Gain-BW Product
25
MHz
S/R
Slew Rate
10pF across COMP to GND
8
V/
μS
Output Voltage Swing
No Load
0.5
4.0
V
IFB
FB Pin Source Current
μA
Gate Drive
RHUP
HDRV Pull-up Resistor
Sourcing
1.8
3.0
Ω
RHDN
HDRV Pull-down Resistor
Sinking
1.8
3.0
Ω
RLUP
LDRV Pull-up Resistor
Sourcing
1.8
3.0
Ω
RLDN
LDRV Pull-down Resistor
Sinking
1.2
2.0
Ω


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