MB3874 Fujitsu Media Devices, MB3874 Datasheet - Page 24

• Manufacturer Part Number: MB3874
• Description: DC/DC Converter IC for Parallel Charging
• Manufacturer: Fujitsu Media Devices

24
MB3874/MB3876
Note: KIKUSUI : KIKUSUI Electronics Corp.
•
100
MB3876
98
96
94
92
90
88
86
84
82
80
20
18
16
14
12
10
10 m
100
8
6
4
2
0
98
96
94
92
90
88
86
84
82
80
0.0
10 m
Conversion efficiency vs.charge current
BATT voltage vs. BATT charge current
Conversion efficiency vs.charge current
0.2
Parallel charging, BATT1 Charge voltage =16.8 V,
f
OSC
I
BATTI
%)=((V
BATT1 charge current I
= 282.71 kHz,
BATT1 charge current I
Vin 19 V
= I
BATT1 charge current I
0.4
Dead Battery MODE
BATT2
(Fixed voltage mode)
Vin 19 V
BATT1
BATT1 charge voltage =16.8V,
f
OSC
(Fixed voltage mode)
100 m
0.6
%)=(V
= 282.71kHz, BATT2 = OPEN,
100 m
I
DCC Dynamically-Controlled Charging
BATT1
0.8
BATT1
)+(V
1.0
BATT2
I
BATT1
1.2
)/(Vin
I
BATT2
1
BATT1
1.4
BATT1
))/(Vin
1
BATT1
Vin = 19V,
BATT2 = open,
BATT1:Electronic load,
(Product of KIKUSUI
PLZ-150W)
Iin)
DCC MODE
(A)
1.6
(A)
(A)
100
Iin)
1.8
100,
10
2.0
10
100
20
18
16
14
12
10
98
96
94
92
90
88
86
84
82
80
100
8
6
4
2
0
98
96
94
92
90
88
86
84
82
80
0.0
0
0
Conversion efficiency vs. charge voltage
0.2
BATT voltage vs. BATT charge current
Conversion efficiency vs. charge voltage
2
2
BATT1 charge current I
BATT1 charge voltage V
BATT1 charge voltage V
0.4
Dead Battery MODE
BATT2 = OPEN,
BATT1 : Electronic load,
(Prouct of KIKUSUI PLZ-150W)
Vin 19 V
R10 15 k
4
Vin 19 V
R10 15 k
4
Parallel charging,
BATT1 : Electronic load,
(Prouct of KIKUSUI PLZ-150W),
I
BATTI
(Fixed current mode)
0.6
(Fixed current mode)
6
= I
DCC Dynamically-Controlled Charging
6
0.8
BATT2
8
8
1.0
10
10
1.2
12
12
1.4
BATT1
Parallel charging,
Vin = 19V,
BATT1: Electronic load,
(Product of KIKUSUI
PLZ-150W),
I
BATTI
BATT1
BATT1
DCC MODE
14
= I
1.6
14
(A)
BATT2
(V)
(V)
16
1.8
16
18
2.0
18