MB39A125 Datasheet, PDF (29/64 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging Li-ion Battery

MB39A125/126
■ SETTING THE CHARGE VOLTAGE
MB39A125
The charging voltage (DC/DC output voltage) can be set by connecting external output voltage setting resistors
(R3, R4) to the −INE3 terminal (pin 16) . Be sure to select a resistor value that allows you to ignore the on-
resistance (35 Ω, 1 mA) of the internal FET connected to the OUTD terminal (pin 11) .
Battery charging voltage : Vo
Vo (V) = (R3 + R4) / R4 × 4.2 (V)
B ^Vo
R3 _−INE3
16
R4
11
OUTD
<Error Amp3>
−
+
4.2 V
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