I'm designing a power supply for data acquisition device which needs clean 5V. I decided to use ADP1613 and ADM7150 ICs to get 6.2V from SEPIC DC/DC converter and 5V from LDO. Power requirement is 5V@200mA and less then 1mV ripple. I want to ask if it is possible to review my design? I've attached layout screenshot. It is a 4 layer PCB where:
top - signal layer inner1 - PGND isolated from rest of the PCB (green lines) inner2 - signal and GND bottom - GND and signal - feedback DC/DC signals
Is it possible to verify grounding for this design ? Any suggestion is welcomed?