MB3887 Datasheet, PDF (27/33 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging Li-ion battery

MB3887
■ REFERENCE DATA
Conversion efficiency vs. Charge current
(Constant voltage mode)
100
98
Ta = +25 °C
VIN = 19 V
96 BATT charge voltage =
94
set at 12.6 V
SW = ON
92 Efficiency η (%) =
90 ^{(VBATT × IBATT) /}
(VIN × IIN) × 100
88
86
84
82
80
10 m
100 m
1
10
BATT charge current IBATT (A)
Conversion efficiency vs. Charge current
(Constant current mode)
100
98
Ta = +25 °C
VIN = 19 V
96 BATT charge voltage =
94 ^{set at 12.6 V}
SW = ON
92 _{Efficiency η (%) =}
90 ^{(VBATT × IBATT) /}
(VIN × IIN) × 100
88
86
84
82
80
0
2
4
6
8 10 12 14 16
BATT charge voltage VBATT (V)
Conversion efficiency vs. Charge current
(Constant voltage mode)
100
98
96
94
92
90
88
86
84
82
80
10 m
Ta = +25 °C
VIN = 19 V
BATT charge voltage =
set at 16.8 V
SW = ON
Efficiency η (%) =
(VBATT × IBATT) /
(VIN × IIN) × 100
100 m
1
10
BATT charge current IBATT (A)
Conversion efficiency vs. Charge current
(Constant current mode)
100
98
96
94
92
Ta = +25 °C
90
VIN = 19 V
BATT charge voltage =
88
set at 16.8 V
86
SW = ON
Efficiency η (%) =
84
(VBATT × IBATT) /
82
(VIN × IIN) × 100
80
0 2 4 6 8 10 12 14 16 18 20
BATT charge voltage VBATT (V)
(Continued)
27