MB39A125 Datasheet, PDF (30/64 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging Li-ion Battery

MB39A125/126
MB39A126
The setting of the charge voltage is switched to 3cells or 4cells by the SEL terminal (pin 11) .
Charge voltage is set to 16.8 V when SEL terminal is “H” level, and charge voltage is set to 12.6 V when SEL
terminal is “L” level.
Battery charging voltage : Vo
Vo (V) = (150 kΩ + 50 kΩ) / 50 kΩ × 4.2 (V) = 16.8 (V) (SEL = H)
Vo (V) = (150 kΩ + 50 kΩ) / 50 kΩ × 3.15 (V) = 12.6 (V) (SEL = L)
−INC1
12
−INE3 ^R3
16
R4
150 kΩ _{<Error Amp3>}
−
50 kΩ
+
SEL
11
3.15 V
4.2 V
30