The other two are close-ups, four of which cooperate with Nanxin SC8815 to form an H-bridge buck-boost circuit, which is responsible for bidirectional charging and discharging of mobile power.

Silk screen 94B438KUN, from ABOV modern microcontroller, I2C interface directly communicates with Southchip SC8815 buck-boost controller, used for mobile power port control and power display and other functions.

Screen printing DDO 3A9 regulator IC.