MB3883 Datasheet, PDF (34/39 Pages) Fujitsu Component Limited. – 6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down

MB3883
s REFERENCE DATA
Conversion efficiency vs. load current
(CH1 : Zeta method with synchronous rectification)
90
Iin
88
Vin
86
To OUT1-1
84
C17
82
2.2 µF
80
To OUT1-2
78
Vin = 2.5 V
Vin = 3 V
76
Vin = 3.6 V
Vin = 4.2 V
74
Ta = +25 °C
72
3.3 V output
70
VCC = VCC(O) = 5 V
0 50 100 150 200 250 300 350 400 450 500
Load current IL (mA)
Q1
R1
82 Ω
C10
3300 pF
C1
4.7 µF
A
L1
10 µH
L2
22 µH
Vo1
(3.3 V)
IL
C2
Q3
D1 ^{4.7 µF}
η (%) = ^{Vo1 × IL} × 100
Vin × Iin
Conversion efficiency vs. load current
(CH2 : Zeta method with synchronous rectification)
90
Iin
88
Vin
86
To OUT2-1
84
C18
82
2.2 µF
80
To OUT2-2
78
Vin = 2.5 V
Vin = 3 V
76
Vin = 3.6 V
Vin = 4.2 V
74
Ta = +25 °C
72
2.5 V output
VCC = VCC(O) = 5 V
70
0 50 100 150 200 250 300 350 400 450 500
Load current IL (mA)
Q2
R2
110 Ω
C11
3300 pF
C3
4.7 µF
B
L3
15 µH
L4
22 µH
Vo2
(2.5 V)
IL
C4
Q4
D2 ^{4.7 µF}
η (%) = ^{Vo2 × IL} × 100
Vin × Iin
Note : The above application uses a constant of
Vin=2.5 V, with settings made at maximum load.
(Continued)
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