ACT4911 datasheet(26/33 Pages) QORVO

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

26 of 33

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ACT4911

Power Loss Protection with 6A eFuse

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

ACT4911 PCB. Refer to the Qorvo ACT4911 Evaluation

Kits for layout examples

Place the buck input capacitors as close as

possible to the IC. Connect the input capacitors

directly between STR and PGND pins on the

top layer. Routing these traces on the top layer

eliminates the need for vias.

Minimize the switch node trace length between

the SW pin and the inductor. Optimal switch

node routing is to run the trace between the

input capacitor’s pads. Using 1206 or larger

sized input capacitors is recommended. Avoid

routing sensitive analog signals near these high

frequency, high dV/dt traces.

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.

The FB pin should be Kelvin connected to the

output capacitor through the shortest possible

route, while keeping sufficient distance from

switching node to prevent noise injection. The

IC regulates the output voltage to this Kelvin

connection.

Connect the PGND and VSS ground pins must

be electrically connected together. The VSS

ground plane should be isolated from the rest

of the PCB power ground.

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 ther-

mal 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.

ACT4911 Datasheet(PDF) 26 Page - Qorvo, Inc

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