To do power saving for a battery operated product, I am using couple of load switches to shut down peripheral power when not using that.

PCB stackup - Signal(component), Gnd, Power, Signal -- 4 layers

There are few analog signals as well, one ADC, DAC IC - so the plan is to keep single ground plane with separate analog and digital routing.

The problem is - should I be splitting the power planes into multiple sections for each load switch output? Attached block diagram of the power section. Kindly suggest the best method. enter image description here

  • \$\begingroup\$ SWitched loads with Caps are disturbances in transient currents and voltages that even a plane may not help if the source impedance is not much much lower than the load. Also how much load ripple is expected. Can you compute LdI/dt + IR = V noise ? with conducted noise and radiated noise? \$\endgroup\$ – Sunnyskyguy EE75 Jan 12 at 7:15

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