Rainbow Electronics MAX16064 - Manual (Page 50)

MAX16064
±0.3% Accurate, Quad, Power-Supply Controller with
Active-Voltage Output Control and PMBus Interface
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Figure 19. MAX16064 Graphic User Interface
PCB Consideration
Accurate voltage measurement and voltage regulation
can be achieved by following these guidelines for good
PCB layout:
1) Place IC decoupling and filter capacitors for AVDD,
DVDD, REFO, and RS_C as close as possible to
the IC pins. If using an external EEPROM, place it
close to the MAX16064 and use short direct traces
for interconnections.
2) Use Kelvin connections for the differential pair
traces from the desired remote-sense points on the
power-supply output-voltage power plane to RS_+
and RS_- of the MAX16064 for accurate power-
supply output-voltage sensing.
3) Connect the analog grounds (AGND, AGND1) and
digital ground (DGND) of the MAX16064 to a
ground plane right at the IC. Terminate all other
ground connections to this ground plane. Connect
this ground plane to the quiet analog ground plane
of the power supply so that the reference voltage to
the power supply is unaffected by switching noise.
Use a single-point (star) grounding technique to
connect the analog ground plane of the power sup-
ply to the heat dissipating power ground plane of
the power supply. Place MAX16064 as close as
possible to the power supply for best temperature
measurement performance.
4) Refer to the MAX16064 Evaluation kit for a sample
layout.