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Replies: 1
Views: 47
Part Number: LMK03328
Hi allWould you mind if we ask LMK03328?There is the power up sequence on the data sheet Figure.86.On the customer's board, the power up sequence of VDD_PLLX, _IN, _DIG=3.3V and VDD_01, -_x are starts up the same timing.Is there any trouble?Or we have to proceed the sequence 3.3V -> 1.8V definitely like as Figure.86?(Because, protection diodes connect to each power rail,,,,)Kind regards,Hirotaka Matsumoto
Hello Matsumoto-san,
It's okay to ramp-up all power-supplies at the same time. Please make sure that the PDN pin is released after all supplies have reached 95% of the final value. This is be either done by delaying the control signal from host controller or adding a capacitor to GND on PDN pin (if PDN is pulled-up by a resistor).
Best regards,
dinesh.