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MAX5037 Evaluation Kit
Detailed Description
The MAX5037 EV kit is a voltage-regulating module that
provides 1.1V to 1.85V at 52A current from either a 5V or
12V input. The input voltage range can be 4.75V to 5.5V
for 5V input and 8V to 13.2V for 12V input conditions.
Use 2200μF/16V across the input if the wires running
from the source to the EV kit are thin and long. The out-
put voltage is set from 5-bit VID input according to the
Intel VRM 9.0 specification (see Table 1). The form factor
V CNTR + ? V OUT /2
V CNTR
V CNTR - ? V OUT /2
and input/output terminations are also as per the Intel
VRM 9.0 specification. See Table 2 for pinouts of edge
connectors compatible with AMP1364125-1. CLKIN is
NO LOAD
1/2 LOAD
LOAD (A)
FULL LOAD
accessible through a 3-pin header (JP3), and a shunt is
provided for setting the switching frequency to either
250kHz or 500kHz. The phase-shifted clock output
(CLKOUT) is available at the 2-pin header (JP5) and can
be used to synchronize other MAX5037 EV kits. Use JP3
to set the phase shift of 60 ° , 90 ° , or 120 ° .
The MAX5037 EV kit is designed to achieve optimum
electrical performance at a 12V input. High efficiency is
achieved with careful component selection (Figure 18).
The switching MOSFETs, inductors, and sense resistors
are the major power-dissipating components. Two
MOSFETs are used at the upper and lower sides of
each phase to distribute the dissipated power in two
different packages. The product of the gate charge and
on-resistance of the MOSFET is a figure of merit, with a
lower number signifying better performance. The
MOSFETs chosen are optimized for a high-frequency
switching application. The upper MOSFETs have a low
gate charge and moderate on-resistance, and the lower
MOSFETs have very low on-resistance and a moderate
gate charge. The inductor is a low-profile, high-current
type with low DC resistance. The sense resistors have
very low inductance. Plenty of copper is provided
around these power components to dissipate heat
effectively. The input capacitors are high-ripple-current
capacity, very low ESR, ceramic type. The output
capacitors have to support large output current during
the load transient. Both polymer and ceramic-type
capacitors are used to achieve high output capacitance
Figure 2. VRM Loadline with V CNTR = VID at Half Load
the shunt to pins 1 and 2 of JP4. For optimum transient
load performance, replace the existing 0.6μH inductors
with 0.3μH inductors.
Output Voltage
The output voltage set through the VID code has ±0.8%
accuracy. The voltage positioning and the ability to
operate with multiple reference voltages might require
the output to regulate away from a center value. Define
the center value as the voltage when the output voltage
equals the VID reference at exactly one-half the maximum
output current.
Set the voltage-positioning window ( ? V OUT ) using the
resistive feedback of the voltage-error amplifier. Use
the following equation to determine the values of R F
(R23) and R IN (R24) required for setting the voltage-
positioning window:
? V OUT = (R24 ? I OUT ) / (2 ? R23 ? G C )
The voltage at CNTR (pin 18) regulates to 1.2V (Figure
18). The inverting input to the voltage-error amplifier
(VEA) mirrors the current set by the resistor at CNTR,
centering the output voltage-positioning window around
the VID programmed output voltage. Set the center of
the output voltage with a resistor from CNTR to SGND as:
? + ( V OUT ? VID )
? 2 × R 23 × G C ?
and low ESR at high frequency.
5V Input Operation
The EV kit is designed for the best efficiency, transient
load performance at 12V input. The 5V input operation
R 21 =
? R 24 ?
I OUT ?
1 . 2 × R 24
can also be verified without significant component
change. Short the JMPR-5VIN pins with wire on the bot-
tom layer of the EV kit PC Board. This connects IN (pin
G C =
0 . 05
R S
28) and V CC (pin 27) of the MAX5037. For 5V input
operation, the switching frequency can be increased to
500kHz without significantly increasing the power losses.
R S =
R 1 × R 2
R 1 + R 2
=
R 3 × R 4
R 3 + R 4
To change the switching frequency to 500kHz, move
6
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