Technical Note

3/9

BD3925FP-C,BD3925HFP-C

www.rohm.com

2011.03 - Rev.B

© 2011 ROHM Co., Ltd. All rights reserved.



Reference Data (BD3925FP-C)

Unless otherwise specified, Vcc=13.2V, ADJ=5V, SW=3V, Ta=25°C

0

1

2

3

4

5

6

0

500

1000

1500

2000

-1

0

1

2

3

4

5

0

6

12

18

24

30

36

-1

0

1

2

3

4

5

0

6

12

18

24

30

36

0

10

20

30

40

50

60

0

6

12

18

24

30

36

0

10

20

30

40

50

60

70

10

100

1000

10000 100000 1000000

FREQUENCY: f [Hz]

0

1

2

3

0

100

200

300

400

500

OUTPUT CURRENT: Io[mA]

0

40

80

120

160

200

0

6

12

18

24

30

36

0

10

20

30

40

50

-40

0

40

80

120

℃]

0

20

40

60

80

100

120

140

0

100

200

300

400

500

OUTPUT CURRENT: Io[mA]

0

1

2

3

4

5

6

100

120

140

160

180

200

0

1

2

3

4

5

6

7

02468

10

12

14

16

0

1

2

3

4

5

6

01

23

Fig.3 Output voltage vs

power supply voltage 2

(Io=200mA)

Fig.2 Output voltage vs

power supply voltage 1

(Io=5mA)

Fig.1 Bias current

Fig.6 Output voltage vs SW input voltage

Fig.4 Dropout voltage

Fig.5 Ripple rejection

Fig.7 Bias current classified by load

Fig.9 Output voltage vs load

Fig.8. Thermal shutdown circuit

Fig.10 SW bias current

Fig.12 Bias current vs temperature

Fig.11 ADJ bias current