BD9845FV Datasheet, PDF (4/16 Pages) Rohm – Single/Dual-output High-frequency Step-down Switching Regulator(Controller type)

BD9845FV
●Reference data
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
VCC=6.0V
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
SS Voltage: VSS(V)
Fig.13 SS source current
120
CCP=1800pF
110
100
VCC=6V
90
80
-50
-25 0 25 50 75 100 125
Ambient Temperature: Ta(°C)
Fig.16 Oscillation frequency
temperature characteristics
100
90
80
70
60
50
40
VCC=6.0V
30
Ta=25°C
20
10
0
1.4
1.6
1.8
2
2.2
DT Input Voltage: VDT(V)
Fig.19 Output Duty-VDT
characteristics (100kHz)
40
35
Ta=-40°C
30
Ta=25°C
25
Ta=85°C
20
15
10
VCC=6.0V
5
0
C5V
C5V
-0.05
C5V
-0.10
VOUT(V)
C5V
-0.15
C5V
-0.20
Fig.22 Output ON resistance L
(RONH)
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Technical Note
35
30
Ta=-40°C
Ta=25°C
25
20 ^Ta=85°C
15
10
VCC=6.0V
5
0
0
0.5
1
1.5
2
SS Voltage: VSS(V)
Fig.14 SS sink current
7
6
5
4
3
2
VCC=6.0V
1
Ta=25°C
0
0
0.5
1
1.5
2
2.5
DT Input Voltage: VDT(V)
Fig.17 DT bias current
5
4
3
VCC=6.0V
2
1
0
-50 -25 0
25 50 75 100 125
Ambient Temperature: Ta(°C)
Fig.15 SS source current
temperature characteristics
7
6
5
Ta=-40°C
Ta=25°C
4
3
Ta=85°C
2
VCC=6.0V
1
0
0
0.5
1
1.5
2
2.5
DT Input Voltage: VDT(V)
Fig.18 DT sink current
100
90
80
70
60
VCC=6.0V
Ta=25°C
50
40
30
20
10
0
1.4
1.6
1.8
2
2.2
DT Input Voltage: VDT(V)
Fig.20 Output Duty-VDT
characteristics (1.5MHz)
40
35
30
25
20
15
10
5
0
VCC
Ta=-40°C
Ta=25°C
Ta=85°C
VCC=6.0V
Ta=25°C
VCC
-0.05
VCC
-0.10
VOUT(V)
VCC
-0.15
VCC
-0.20
Fig.21 Output ON resistance H
(RONH)
500
450
VCC=35V
400
Ta=85
350
Ta=25
300
250
Ta=-40℃
200
150
100
50
0
0 5 10 15 20 25 30 35 40
VSTB(V)
Fig.23 STB flow-in current
70
65
60
55
50
45
40
35
30
-50
VCC=6V
-25 0 25 50 75 100 125
Ambient Temperature: Ta(°C)
Fig.24 Overcurrent detection
voltage temperature characteristics
4/15
2009.05 - Rev.A