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AMD Mobile Serial VID Dual-Phase
Fixed-Frequency Controller
Table 4. Output Voltage VID DAC Codes (continued)
SVID[6:0]
000_1010
000_1011
000_1100
000_1101
000_1110
000_1111
001_0000
001_0001
001_0010
001_0011
001_0100
001_0101
001_0110
001_0111
001_1000
001_1001
001_1010
001_1011
001_1100
001_1101
001_1110
001_1111
OUTPUT
VOLTAGE (V)
1.4250
1.4125
1.4000
1.3875
1.3750
1.3625
1.3500
1.3375
1.3250
1.3125
1.3000
1.2875
1.2750
1.2625
1.2500
1.2375
1.2250
1.2125
1.2000
1.1875
1.1750
1.1625
SVID[6:0]
010_1010
010_1011
010_1100
010_1101
010_1110
010_1111
011_0000
011_0001
011_0010
011_0011
011_0100
011_0101
011_0110
011_0111
011_1000
011_1001
011_1010
011_1011
011_1100
011_1101
011_1110
011_1111
OUTPUT
VOLTAGE (V)
1.0250
1.0125
1.0000
0.9875
0.9750
0.9625
0.9500
0.9375
0.9250
0.9125
0.9000
0.8875
0.8750
0.8625
0.8500
0.8375
0.8250
0.8125
0.8000
0.7875
0.7750
0.7625
SVID[6:0]
100_1010
100_1011
100_1100
100_1101
100_1110
100_1111
101_0000
101_0001
101_0010
101_0011
101_0100
101_0101
101_0110
101_0111
101_1000
101_1001
101_1010
101_1011
101_1100
101_1101
101_1110
101_1111
OUTPUT
VOLTAGE (V)
0.6250
0.6125
0.6000
0.5875
0.5750
0.5625
0.5500
0.5375
0.5250
0.5125
0.5000
0.4875
0.4750
0.4625
0.4500
0.4375
0.4250
0.4125
0.4000
0.3875
0.3750
0.3625
SVID[6:0]
110_1010
110_1011
110_1100
110_1101
110_1110
110_1111
111_0000
111_0001
111_0010
111_0011
111_0100
111_0101
111_0110
111_0111
111_1000
111_1001
111_1010
111_1011
111_1100
111_1101
111_1110
111_1111
OUTPUT
VOLTAGE (V)
0.2250
0.2125
0.2000
0.1875
0.1750
0.1625
0.1500
0.1375
0.1250
0.1125
0.1000
0.0875
0.0750
0.0625
0.0500
0.0375
0.0250
0.0125
0
0
0
0
NBV_BUF Output-Voltage Transition
The MAX17009 includes a buffered output voltage that
sets the target for the NB regulator. When a voltage
transition on the NB DAC occurs, the NBV_BUF
sources or sinks a programmed current on its output.
The programmed current (I NBV_BUF ) is set by R TIME .
R TIME is between 35.7k Ω and 357k Ω for corresponding
I NBV_BUF between 28μA and 2.8μA, respectively:
I NBV_BUF = (7μA) x (143k Ω / R TIME )
I NBV_BUF and the external capacitor (C NBV_BUF ) set
the voltage slew rate of the NBV_BUF:
dV NBV_BUF /dt = I NBV_BUF / C NBV_BUF
Program the NB regulator with a slew rate faster than
that set by NBV_BUF to allow the NBV_BUF to control
the NB regulator’s output slew rate.
Alternatively, the NB regulator can be programmed with
the desired slew rate, and the NBV_BUF voltage can
approach a step function by keeping C NBV_BUF small.
A minimum of 100pF capacitor is required.
Pulse-Skipping Operation
The SMPS of the MAX17009 always operates in pulse-
skipping mode. Pulse-skipping mode enables the driver’s
zero-crossing comparator, so the driver pulls its DL low
when “zero” inductor current is detected (V GND - V LX
= 0). This keeps the inductor from discharging the output
capacitors and forces the controller to skip pulses under
light-load conditions to avoid overcharging the output.
In the pulse-skipping operation, the controller termi-
nates the on-time when the output voltage exceeds the
feedback threshold and when the current-sense voltage
exceeds the Idle Mode current-sense threshold (V IDLE
= 0.15 x V LIMIT ). Under heavy-load conditions, the con-
tinuous inductor current remains above the Idle Mode
current-sense threshold, so the on-time depends only
on the feedback-voltage threshold. Under light-load
conditions, the controller remains above the feedback
voltage threshold, so the on-time duration depends
solely on the Idle Mode current-sense threshold, which
is approximately 15% of the full-load peak current-limit
threshold set by ILIM.
______________________________________________________________________________________
27
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