ACT88430 datasheet(39/74 Pages) QORVO

39 / 74 page

Data Sheet Rev. G, August 2021 | Subject to change without notice

39 of 74

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ACT88430

Advanced PMU for Microcontrollers and Solid State Drive Applications

PC BOARD LAYOUT GUIDANCE

Proper parts placement and PCB layout are critical to

the operation of switching power supplies. Follow the

following

layout

guidelines

when

designing

the

ACT88430 PCB. Refer to the Qorvo ACT88430

Evaluation Kits for layout examples

Place the buck input capacitors as close as possible

to the IC. Connect the capacitors directly to the

corresponding VIN_Bx input pin and PGNDx power

ground pin. Avoid the use of vias if possible.

Minimize the switch node trace length between

each SW_Bx pin and the inductor. Avoid routing

sensitive analog signals near these high frequency,

high dV/dt traces.

Place the LDO input capacitors close to their input

pins. Connect their ground pins into the ground

plane that connects the IC’s exposed pad.

The input capacitor and output capacitor grounds

should be connected as close together as possible,

with short, direct, and wide traces.

Connect the PGNDx ground pins and the AGND

ground pin directly to the exposed pad under the IC.

The AGND

ground

plane

should

routed

separately from the other ground planes and only

connect to the main ground plane under the IC at

the AGND pin.

Connect the VIO_IN input capacitor to the AGND

ground pin.

Connect the VIN input capacitor to the AGND

ground pin.

Remember that all open drain outputs need pullup

resistors.

Connect the exposed pad directly the top layer

ground plane. Connect the top layer ground plane

to both internal ground planes and the PCB back-

side ground plane with thermal vias. Provide ground

plane routing on multiple layers that allows the IC’s

heat to flow into the PCB and then spread radially

from the IC. Avoid cutting the ground planes and

adding

vias

that

restrict

the

radial

flow

heat of operating conditions, and are relatively in-

sensitive to layout considerations.

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