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MAX5037 Evaluation Kit
where R24 and R23 are the input and feedback resistors
of the voltage-error amplifier, GC is current-loop gain,
and RS is the current-sense resistor. See Figure 4 and
Figure 5 for the output voltage vs. the R CNTR (R21).
Applying the voltage-positioning window at different
1.90
1.85
OUTPUT VOLTAGE
vs. I LOAD AND R CNTR
R CNTR = 50k?
VRM voltage settings requires an additional element
proportional to the VID setting. The resistor from REG
(pin 15) to SGND provides a current proportional to the
1.80
1.75
R CNTR = 100k?
VID setting (Figure 18). Calculate the resistor from REG
to SGND as:
R22 = R23
1.70
1.65
1.60
R CNTR = 200k?
V IN = +12V
VID SETTING = +1.75V
R CNTR = ∞
0
5 10 15 20 25 30 35 40 45 50 55
I LOAD (A)
where R23 is the feedback resistor of the voltage-error
amplifier. The voltage on REG is internally regulated to
the programmed VID output voltage.
Figure 4. Output Voltage vs. I LOAD and R CNTR
Note that in the case of VID voltage setting equal to
V COREMAX at I OUT = 0 (no load), R21 is calculated
from the above equation as infinity. Because the VID
1.60
OUTPUT VOLTAGE
vs. I LOAD AND R CNTR
setting has an output voltage set-point accuracy speci-
fication of 0.8%, the output voltage may exceed the
V CCMAX limit. For systems requiring V CCMAX as an
absolute maximum voltage at I OUT = 0 (no load), R REG
can be recalculated using the following equation:
1.55
1.50
1.45
1.40
R CNTR = 50k?
V IN = +12V
VID SETTING = +1.4V
R CNTR = 100k?
R 24 + R 23 × ? 1 ?
?
?
?
R 22 =
R 24 × R 23
? V COREMAX ?
VID
1.35
1.30
1.25
R CNTR = 200k?
R CNTR = ∞
1.20
The voltage positioning of 120mV at 52A load is set in
the MAX5037 EV kit. See Figure 6 for the VRM output
0
5 10 15 20 25 30 35 40 45 50 55
I LOAD (A)
load line for voltage positioning at a different ratio of R F
Figure 5. Output Voltage vs. I LOAD and R CNTR
(R23) and R IN (R24).
OUTPUT VOLTAGE vs. OUTPUT CURRENT
AND ERROR AMP GAIN (R F / R IN )
1.85
V IN = +12V
V COREMAX ≤ VID
V COREMAX - ? V OUT /2
1.80
R f / R IN = 15
V OUT = +1.8V
R f / R IN = 12.   5
1.75
V COREMAX - ? V OUT
1.70
R f / R IN = 7.5
1.65
R f / R IN = 10
NO LOAD
1/2 LOAD
LOAD (A)
FULL LOAD
1.60
0
5 10 15 20 25 30 35 40 45 50 55
I LOAD (A)
Figure 3. VRM Loadline with V COREMAX = VID at No Load
Figure 6. Output Voltage vs. Output Current and Error AMP
GAIN (R F /R IN )
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