MB39A113 Datasheet, PDF (17/51 Pages) Fujitsu Component Limited. – ASSP for Power Supply Applications (Secondary Battery)

MB39A113
s SETTING THE CHARGING VOLTAGE
The charge voltage (DC/DC output voltage) can be set by connecting an external output voltage setting resistors
(R3, R4) to the −INE3 terminal (pin 16) .
Select a resistor value at which the on-resistor (35 Ω at 1 mA) of the built-in FET connected to the OUTD terminal
(pin 11) can be ignored.
Charge voltage of battery : VO
VO (V) = (R3 + R4) /R4 × 4.2 (V)
B ^VO
R3
−INE3
16
R4
11
OUTD
<Error Amp3>
−
+
+
4.2 V
22
CS
s SETTING THE CHARGING CURRENT
The charge current value (output limit current) can be set depending on the voltage value at the +INE2 terminal
(pin 3) .
If a current exceeding the set current value attempts to flow, the charge voltage drops according to the set current
value.
Battery charge current setting voltage : + INE2
+ INE2 (V) = 20 × I1 (A) × RS (Ω)
s SETTING THE TRIANGULAR WAVE OSCILLATION FREQUENCY
The triangular wave oscillation frequency is determined by the timing resistor (RT) connected to the RT terminal
(pin 17) .
Triangular wave oscillation frequency : fosc
fosc (kHz) =: 14100/RT (kΩ)
17