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Differences between libraries names: PCB Design of nRF52832

I am intended to integrate the Nordic SoC nRF52832 in our PCB to generate a PWM. However, I could not understand the difference between the following:

topicSchematic QFAA and QFAB QFN48 with internal LDO setup

topicSchematic QFAA and QFAB QFN48 with DC/DC regulator setup

topicSchematic QFAA and QFAB QFN48 with DC/DC regulator and NFC setup

topicSchematic CIAA WLCSP with internal LDO setup

topicSchematic CIAA WLCSP with DC/DC regulator setup

topicSchematic CIAA WLCSP with DC/DC regulator and NFC setup

Can you please explain to me what each one means? Thank you

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