MB39A125 查看數據表（PDF） - Fujitsu

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MB39A125

DC/DC Converter IC for Charging Li-ion Battery

Fujitsu 

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

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