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ISL62881_10 Datasheet, PDF (14/35 Pages) Intersil Corporation – Single-Phase PWM Regulator for IMVP-6.5™ Mobile CPUs and GPUs
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ISL62881, ISL62881B
TABLE 1. VID TABLE (Continued)
VO
VID6 VID5 VID4 VID3 VID2 VID1 VID0 (V)
1
0
0
0
0
1
1 0.6625
1
0
0
0
1
0
0 0.6500
1
0
0
0
1
0
1 0.6375
1
0
0
0
1
1
0 0.6250
1
0
0
0
1
1
1 0.6125
1
0
0
1
0
0
0 0.6000
1
0
0
1
0
0
1 0.5875
1
0
0
1
0
1
0 0.5750
1
0
0
1
0
1
1 0.5625
1
0
0
1
1
0
0 0.5500
1
0
0
1
1
0
1 0.5375
1
0
0
1
1
1
0 0.5250
1
0
0
1
1
1
1 0.5125
1
0
1
0
0
0
0 0.5000
1
0
1
0
0
0
1 0.4875
1
0
1
0
0
1
0 0.4750
1
0
1
0
0
1
1 0.4625
1
0
1
0
1
0
0 0.4500
1
0
1
0
1
0
1 0.4375
1
0
1
0
1
1
0 0.4250
1
0
1
0
1
1
1 0.4125
1
0
1
1
0
0
0 0.4000
1
0
1
1
0
0
1 0.3875
1
0
1
1
0
1
0 0.3750
1
0
1
1
0
1
1 0.3625
1
0
1
1
1
0
0 0.3500
1
0
1
1
1
0
1 0.3375
1
0
1
1
1
1
0 0.3250
1
0
1
1
1
1
1 0.3125
1
1
0
0
0
0
0 0.3000
1
1
0
0
0
0
1 0.2875
1
1
0
0
0
1
0 0.2750
1
1
0
0
0
1
1 0.2625
1
1
0
0
1
0
0 0.2500
1
1
0
0
1
0
1 0.2375
1
1
0
0
1
1
0 0.2250
1
1
0
0
1
1
1 0.2125
1
1
0
1
0
0
0 0.2000
1
1
0
1
0
0
1 0.1875
1
1
0
1
0
1
0 0.1750
TABLE 1. VID TABLE (Continued)
VO
VID6 VID5 VID4 VID3 VID2 VID1 VID0 (V)
1
1
0
1
0
1
1 0.1625
1
1
0
1
1
0
0 0.1500
1
1
0
1
1
0
1 0.1375
1
1
0
1
1
1
0 0.1250
1
1
0
1
1
1
1 0.1125
1
1
1
0
0
0
0 0.1000
1
1
1
0
0
0
1 0.0875
1
1
1
0
0
1
0 0.0750
1
1
1
0
0
1
1 0.0625
1
1
1
0
1
0
0 0.0500
1
1
1
0
1
0
1 0.0375
1
1
1
0
1
1
0 0.0250
1
1
1
0
1
1
1 0.0125
1
1
1
1
0
0
0 0.0000
1
1
1
1
0
0
1 0.0000
1
1
1
1
0
1
0 0.0000
1
1
1
1
0
1
1 0.0000
1
1
1
1
1
0
0 0.0000
1
1
1
1
1
0
1 0.0000
1
1
1
1
1
1
0 0.0000
1
1
1
1
1
1
1 0.0000
RDROOP
FB
VDROOP
IDROOP
VCCSENSE
VR LOCAL VO
“CATCH”
RESISTOR
COMP
E/A
Σ
DAC
VDAC
INTERNAL TO IC
X1
VIDS
RTN
VSS
VID<0:6>
VSSSENSE
“CATCH”
RESISTOR
FIGURE 12. DIFFERENTIAL SENSING AND LOAD LINE
IMPLEMENTATION
As the load current increases from zero, the output
voltage will droop from the VID table value by an amount
proportional to the load current to achieve the load line.
The ISL62881 can sense the inductor current through the
intrinsic DC Resistance (DCR) resistance of the inductors
as shown in Figure 1 or through resistors in series with
the inductors as shown in Figure 2. In both methods,
capacitor Cn voltage represents the inductor total
currents. A droop amplifier converts Cn voltage into an
internal current source with the gain set by resistor Ri.
14
FN6924.1
February 25, 2010
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