MB3888 Datasheet, PDF (23/30 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging Li-ion Battery

s REFERENCE DATA
MB3888
Conversion efficiency vs. Charge current
(Constant voltage mode)
100
Ta = +25 °C
98 _{VIN = 19 V}
96 BATT charge voltage = set at 12.6 V
94
SW1 = SW2 = ON
Efficiency η (%) =
92 (VBATT × IBATT)
90 ^{/ (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
Ta = +25 °C
98 _{VIN = 19 V}
96 ^{BATT charge voltage = set at 12.6 V}
94
SW1 = SW2 = ON
Efficiency η (%) =
92 (VBATT × IBATT)
90 ^{/ (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
SW1 = SW2 = 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
90
Ta = +25 °C
VIN = 19 V
88
BATT charge voltage =
86
set at 16.8 V
SW1 = SW2 = ON
84
Efficiency η (%) =
82
(VBATT × IBATT)
/ (VIN × IIN) × 100
80
0 2 4 6 8 10 12 14 16 18 20
BATT charge voltage VBATT (V)
(Continued)
23