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Application Note
BD71837MWV Platform Design Guide
© 2018 ROHM Co., Ltd.
No. 61AN002E Rev.001
May.2018
5.2. General Layout Guideline
This section explains the guideline about the layout for voltage regulators. The voltage rails with higher Iomax current especially for
BUCK convertors should be carefully designed not to transmit the unwanted interference caused by switching noises to other signals
with high impedance.
And IR drop caused by large switching currents often influence the violation of the stability for the input level for each buck convertor
so the design for each input should be also taken care. It is highly recommended to follow the all guidelines in this section.
5.2.1. Overall Component Placement
Figure 5.2 shows the overall parts placement. The figure shows the positions of the components needed to be put closely to PMIC. It
is strongly recommended that the components controlling the higher currents like input / output capacitors and inductors are placed in
priority to any other components to guarantee the stabilities of each VR.
Figure 5.2 Overall component placement example
BUCK1
BUCK6
BCUK7
BUCK8
BUCK4
BUCK2
BUCK3
BUCK5
LDO4
LDO1
LDO5
MUXSW
LDO7
LDO3
LDO6
