BD9845FV Datasheet, PDF (3/16 Pages) Rohm – Single/Dual-output High-frequency Step-down Switching Regulator(Controller type)

BD9845FV
●Reference data
10
9
8
7
6
5
4
3
2
1
0
-50
VCC=6V
-25 0 25 50 75 100 125
Ambient Temperature: Ta(°C)
Fig.1 Standby current temperature
characteristics
2.520
2.515
2.510
2.505
2.500
2.495
2.490
2.485
2.480
0
Ta=25°C
5 10 15 20 25 30 35 40
Supply Voltage: VCC(V)
Fig.4 VREF supply voltage
characteristics
3.5
3.4
3.3
3.2
3.1
3
2.9
2.8
2.7
2.6
2.5
-50 -25 0 25 50 75 100 125
Ambient Temperature: Ta(°C)
Fig.7 UVLO threshold temperature
characteristics
8
7
6
5
4
Ta=25°C
3
2
1
0
0 5 10 15 20 25 30 35 40
Supply Voltage: VCC(V)
Fig.2 Circuit current in
operation
2.520
2.515
2.510
2.505
2.500
Ta=25°C
VCC=6V
2.495
2.490
2.485
2.480
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Reference Output Current: IREF(mA)
Fig.5 VREF current capability
100
0
80
Gain
-45
Phase
60
-90
40
Phase -135
20
-180
0
Gain
-225
-20
100
1K
10K 100K 1M
Frequency [Hz]
-270
10M
Fig.8 Error amplifier I/O
characteristics
Technical Note
8
7
6
5
4
3
2
1
0
-50 -25
VCC=6V
0 25 50
75 100 125
Ambient Temperature: Ta(°C)
Fig.3 Circuit current temperature
characteristics in operation
2.520
2.515
2.510
2.505
2.500
2.495
2.490
2.485
2.480
-50 -25
VCC=6V
0 25 50
75 100 125
Ambient Temperature: Ta(°C)
Fig.6 VREF temperature
characteristics
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
VCC=6V
0.4
Ta=25℃
0.2
0.0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
ErrAmp Input Voltage: VINV(V)
Fig.9 Error amplifier input current
1.01
1.008
1.006
1.004
1.002
1
0.998
0.996
0.994
0.992
0.99
-50
VCC=6V
-25 0 25 50 75 100 125
Ambient Temperature: Ta(°C)
Fig.10 Error amplifier reference voltage
temperature characteristics
140
Ta=85°C ^Ta=25°C
120
100
80
60
Ta=-40°C
40
VCC=6.0V
20
0
0
1
2
3
4
ErrAmp Output Voltage: VFB(V)
Fig.11 FB output source current
3.0
2.5
2.0
Ta=85°C
1.5
Ta=25°C
1.0
Ta=-40°C
0.5
0.0
VCC=6.0V
-0.5
0
0.5
1
1.5
2
ErrAmp Output Voltage: VFB(V)
Fig.12 FB output sink current
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3/15
2009.05 - Rev.A