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Como funciona este circuito?

C7
Capacitance
10uF
C8
Capacitance
4.7uF
USB
C4
Capacitance
22uF
R3
Resistance
10kΩ
C5
Capacitance
0.047uF
C6
Capacitance
22uF
C3
Capacitance
10uF
C2
Capacitance
1uF
C1
Capacitance
10uF
R5
Resistance
260 Ω
R6
Resistance
10kΩ
R9
Resistance
10kΩ
R4
Resistance
10kΩ
R1
Resistance
2.2kΩ
U1
LED1
R8
Resistance
10kΩ
HOST
+ VIN -
+ PMID -
R7
Resistance
5.25kΩ
R2
Resistance
31.23kΩ
L1
Inductance
2.2uH

BQ25895 Reference Design