ACT88320 datasheet(31/57 Pages) QORVO

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Data Sheet Rev. E, November 2019 | Subject to change without notice

31 of 57

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ACT88320

Advanced PMU with Inrush Control and Bypass Switch

sensitive analog signals near these high

frequency, high dV/dt traces.

Place the LDO input capacitor close to the AVIN

pin. Connect the capacitor directly to AVIN and

AGND on the top layer.

The Buck output capacitors should be placed

by the inductor and connected directly to the

inductor and ground plane with short and wide

traces. The output capacitor ground should

make a short connection to the input capacitor

ground. If required, use multiple vias.

Each regulator’s FB_Bx should be Kelvin

connected to its output capacitor through the

shortest possible route, while keeping sufficient

distance from switching nodes to prevent noise

injection. The IC regulates the output voltage to

this Kelvin connection.

Connect the PGND and AGND ground pins

must

electrically

connected

together.

Because the AGND ground plane is used for

analog, digital, and LDO grounds, it does not

need to be completely isolated from the rest of

the PCB grounds. However, take care to avoid

routing the buck converter switching currents

through the analog ground connections.

Connect the VIO input capacitor to the AGND

ground pin.

Remember that all open drain outputs need

pull-up resistors.

Connect the exposed pad directly to the top

layer ground plane. Connect the top layer

ground plane to both internal ground planes

and the PCB backside ground plane with

thermal vias. Provide ground plane routing on

multiple layers to allow the IC’s heat to flow into

the PCB and then spread radially from the IC.

Avoid cutting the ground planes or adding vias

that restrict the radial flow of heat.

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