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CC2640: CC2640F128RSMR use Internal DC-DC Regulator, DCDC_SW output voltage below the nominal value of the datasheet.

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Part Number:CC2640

Input voltage on VDDS is 3.3V, DCDC_SW output voltage only 1.6V, not 1.8V

The schematic is as follows:

 Inductor(L4) P/N is LB2012T100M.

DCDC_SW layout is

would you please help give advice, why the output voltage is low?

thank you.

BR

Kelly


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