MB39A119 Datasheet, PDF (41/53 Pages) Fujitsu Component Limited. – DC/DC Converter IC of Synchronous Rectification for charging Li-ion battery

MB39A119
4. Charging current setting sense resistor (SL1TTE33L0F : KOA product)
33 mΩ
When + INE2 terminal (pin 12) voltage is 3.3 V, and the charging current (IO) is 4.0 A, R4 is obtained by the
following formula.
+ INE2
R4 =
24.5 × IO
3.3
=
24.5 × 4.0
=: 33.0 mΩ
5. Input current setting sense resistor (SL1TTE15L0F : KOA product)
15 mΩ
When + INE1 terminal (pin 7) voltage is 2.25 V, and the input current is 6.0 A, R1 is obtained by the following
formula.
+ INE1
R1 =
25 × I1
2.25
=
25 × 6.0
=: 15.0 mΩ
6. Switching P-ch FET (µPA1772 : NEC product, TPC8102 : TOSHIBA product)
Q2-1, Q2-2, and Q5 must select an appropriate device according to the input current.
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