Datasheet

5/16
Technical Note
OUTPUT CURRENT : IO[A]
10
20
30
40
50
60
70
80
90
100
0
00.51.0
CONVERSION EFFICIENCY [%]
1.5 2.0
5V output
3.3V output
Fig.18 IO vs Efficiency(VIN=12V,f=100kHz)
ý(BD9778F/HFP)
0
1
2
3
4
5
6
OUTPUT VOLTAGE : VO[V]
102345
OUTPUT CURRENT : IO[A]
Ta= 25 Ŋ
Ta=125Ŋ
Ta=-40Ŋ
Fig.21 Current capacitance(VIN=12V,Vo=5V,f=100kHz)
(BD9778F/HFP)
0
1
2
3
4
5
6
10234567
OUTPUT CURRENT : IO[A]
OUTPUT VOLTAGE : VO[V]
Ta=25Ŋ
Ta= 125Ŋ
Ta=-40Ŋ
Fig.20 Current capacitance(VIN=12V,Vo=5V,f=100kHz)
(BD9781HFP)
0
1
2
3
4
5
6
102345
OUTPUT CURRENT : IO[A]
OUTPUT VOLTAGE : VO[V]
Ta= 25 Ŋ
Ta= 12 5Ŋ
Ta=-40Ŋ
Fig.22 Current capacitance(VIN=12V,Vo=5V,f=100kHz)
(BD9001F)
Fig.16 ON resistance VIN=13.2V
(BD9001F)
Fig.19 IO vs Efficiency(VIN=12V,f=100kHz)
ý(BD9001F)
00.40.81.2 1.6 2
OUTPUT CURRENT : IO[A]
CONVERSION EFFICIENCY [%]
5V output
3.3V output
2.5V output
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
Fig.14 ON resistance VIN=13.2V (BD9778F/HFP) Fig.15 ON resistance VIN=7V (BD9001F)
0.50.0 1.0 1.5 2.0 2.5
OUTPUT CURRENT : IO[A]
FET ON RESISTANCE : RON[Ω]
Ta= 25 Ŋ
Ta= 125Ŋ
Ta=-40Ŋ
00.5 1 1.5 2 2.5
OUTPUT CURRENT : IO[A]
FET ON RESISTANCE : RON[Ω]
Ta= 25 Ŋ
Ta= 125Ŋ
Ta=–40Ŋ
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
Fig.13 ON resistance VIN=7V (BD9778F/HFP)
OUTPUT CURRENT : IO[A]
0.50.0 1.0 1.5 2.0 2.5
FET ON RESISTANCE : RON[Ω]
Ta=25Ŋ
Ta= 125Ŋ
Ta=-40Ŋ
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
00.51 1.522.5
OUTPUT CURRENT : IO[A]
FET ON RESISTANCE : RON[Ω]
Ta= 25 Ŋ
10
20
30
40
50
60
70
80
90
100
0
Ta=125Ŋ
Ta=–40Ŋ
2.5V output
1.5V output
10
20
30
40
50
60
70
80
90
100
0
CONVERSION EFFICIENCY [%]
OUTPUT CURRENT : IO[A]
Fig.17 IO vs Efficiency(VIN=12V,f=200kHz)
ý(BD9781HFP)
0.50.0 1.0 1.5 2.0 2.5 3.0
3.3V output
2.5V output
5V output
2010.02 - Rev. B
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BD9778F, BD9778HFP, BD9001F, BD9781HFP