A2337 2020 MacBook Air

A2337 (820-02016) MacBook Air

820-02016 Power Sequence
Once a valid external power source (Charger or battery) is connected, the following rails will come online.

PPBUS_AON- Normal voltage ~12.6 - 13.1. Produced from the ISL9240 (U5200) that uses PPDCIN_AON_CHGR_R as its VIN.

PP3v8_AON_VDDMAIN- Normal voltage is ~3.8v. Produced from U5700 that uses PPBUS_AON as its VIN.