P9415-R Datasheet

© 2021 Renesas Electronics Corporation

39

May 4, 2021

9.14PCB Layout Considerations

For optimum device performance and lowest output noise, the following guidelines should be observed. Please contact Renesas for Gerber

files that contain the recommended board layout.

An optimum layout is one with all components on the same side of the board, minimizing vias through other signal layers. Signal traces not

related to the P9415-R should be routed away from the IC as much as possible to avoid blocking thermal dissipation paths from the IC to the

PCB. This includes signal traces just underneath the device, or on layers adjacent to the ground plane layer used by the device.

Layout and PCB design have a significant influence on the power dissipation capabilities of power management ICs because the surface-mount

packages used with these devices rely heavily on thermally conductive traces or pads to transfer heat away from the package. Appropriate PC

layout techniques should be used to remove the heat due to device power dissipation.

The following general guidelines are helpful with designing a board layout for lowest thermal resistance:

1. PC board traces with large cross-sectional areas remove more heat. For optimum results, use large-area PCB patterns with wide copper

traces, placed on the P9415-R side of the PCB.

2. In cases where maximum heat dissipation is required, use double-sided copper planes connected with multiple vias.

3. Thermal vias are needed to provide a thermal path to inner and/or bottom layers of the PCB to remove the heat generated by device power

dissipation.

9.15Special Notes

Package assembly:



Unopened dry packaged parts have a one-year shelf life.



The HIC indicator card for newly-opened dry packaged parts should be checked. If there is any moisture content, the parts must be baked

for a minimum of 8 hours at 125˚C within 24 hours of the assembly reflow process.

10. I2C Function

The P9415-R uses standard I2C slave implementation protocol to communicate with a host Application Processor (AP) or other I2C

peripherals. The I2C slave address is decided by GP4 voltage. During the P9451-R power-up, if the GP4 pin is pulled down, the I2C address

is 0x3B. During the P9451-R power-up, if the GP4 pin is pulled high, the I2C address is 0x3F.

The AP can write to only the registers that are marked as Read/Write (RW). Registers marked as Read Only (R) should never be sent a Write

command. Likewise, register locations marked Reserved should not receive a Write command. When writing to a RW register that contains a

combination of RW fields and reserved fields, a read-modify-write should be performed to the intended bit/field only. All other bits, including

reserved bits should NOT be modified.