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MAX5037 Evaluation Kit
Ripple and Noise
The worst-case peak-to-peak output-ripple voltage
depends on the inductor ripple current, capacitance,
and ESR of the output capacitors. In multiphase con-
verter design, the ripple currents from individual phas-
100
90
EFFICIENCY vs. OUTPUT CURRENT
AND INPUT VOLTAGE
es cancel each other, and the resultant ripple current is
lower. The degree of ripple cancellation depends on
the operating duty cycle and number of phases. Note
that ripple cancellation is maximum when the N PH =
K/D condition is met, where N PH is the number of phas-
es, D is the operating duty cycle, and K = 1, 2, or 3.
See Figure 7 for the output ripple waveforms of the EV
kit at full load.
Transient Load Response
The EV kit is designed to handle high slew-rate-current
step without exceeding the dynamic load regulation limit
80
70
60
50
40
30
20
10
0
V IN = +12V
V IN = +5V
V OUT = +1.8V
f SW = 250kHz
0 4 8 12 16 20 24 28 32 36 40 44 48 52
I OUT (A)
of the output voltage. Figure 8 depicts the dynamic load
performance with 50A/μs slew rate of the current step.
OUTPUT RIPPLE
Figure 9. Efficiency vs. Output Current and Input Voltage
EFFICIENCY vs. OUTPUT CURRENT
AND OUTPUT VOLTAGE
100
90
80
70
V OUT = +1.5V
V OUT = +1.8V
V IN = +12V
V OUT = +1.75V
I OUT = 52A
V OUT
(AC-COUPLED)
10mV/div
60
50
40
30
20
10
0
V IN = +12V
f SW = 250kHz
V OUT = +1.1V
500ns/div
Figure 7. Output Ripple
LOAD-TRANSIENT RESPONSE
0 4 8 12 16 20 24 28 32 36 40 44 48 52
I OUT (A)
Figure 10. Efficiency vs. Output Current and Output Voltage
EFFICIENCY vs. OUTPUT CURRENT
AND OUTPUT VOLTAGE
100
90
80
70
60
V OUT = +1.5V
V OUT = +1.8V
V OUT
50mV/div
V IN = +12V
50
40
30
20
V OUT = +1.1V
V OUT = +1.75V
I STEP = 8A TO 52A
t RISE = 1 μ s
10
0
V IN = +5V
f SW = 500kHz
0 4 8 12 16 20 24 28 32 36 40 44 48 52
40 μ s/div
Figure 8. MAX5037 EV Kit Transient Response
I OUT (A)
Figure 11. Efficiency vs. Output Current and Output Voltage
8
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