FAN5078 Datasheet, PDF (7/16 Pages) Fairchild Semiconductor – DDR/ACPI Regulator Combo

Electrical Specifications
Recommended operating conditions; component values per Figure 1, unless otherwise noted.
Parameter
Power Supplies
VCC Current: S0
S3
S5
VCC UVLO Threshold
5V MAIN UVLO Threshold
5V MAIN Input Resistance
Oscillator
Frequency
Ramp Amplitude, pk–pk⁽¹⁾
Ramp Offset
Reference and Soft Start
Internal Reference Voltage
ILIM Reference Voltage
Average Soft Start Current
(ISS)
SS Discharge Resistance
SS Complete Threshold
SS Complete Hysteresis
PWM Converter
Load Regulation
FB Bias Current
Under-Voltage Shutdown
Over-Voltage Threshold
ISNS Over-Current Threshold
VDDQ IN Discharge
Resistance
COMP Source Current
COMP Sink Current
Error Amp GBW Product⁽¹⁾
Error Amp DC Gain⁽¹⁾
Conditions
LDRV, HDRV Open, FB forced above
regulation point, I(VTT) = 0, EN=1, S3#I=1
EN=1, S3#I = LOW, I(3.3) < 10mA
EN=0, I(3.3) = 0
Rising VCC
Falling
Hysteresis
Rising
Falling
Hysteresis
to GND
-2μA > I_ILIM > -18μA
Initial ramp after power-up
During PWM / LDO soft start
EN = 0
IOUT from 0 to 15A
as % of set point, 2 μS noise filter
as % of set point
RILIM= 56KΩ
EN = 0
V_COMP = 2.5V
V_COMP = 2.5V
Min.
4.0
3.9
4.3
3.9
35
255
0.891
0.882
-2
-1.8
65
110
-195
20
Typ.
15
15
2
4.2
4,1
0.15
4.4
4.1
0.30
62
300
1.8
0.5
0.900
0.900
4.2
45
150
1.5
50
-1.3
75
115
-170
650
100
5.5
82
Max. Units
24
mA
24
mA
4
mA
4.4
V
4.3
V
V
4.6
V
4.2
V
V
KΩ
345
KHz
V
V
0.909
V
0.918
V
µA
Ω
V
mV
+2
-0.8
80
120
-145
55
%
µA
%
%
µA
Ω
µA
µA
MHz
dB
© 2006 Fairchild Semiconductor Corporation
7
FAN5078 Rev. 1.0.0 • 05/11/06
www.fairchildsemi.com