BD9778HFP datasheet(4/17 Pages) ROHM

No de pièce	BD9778HFP

Description	Flexible Step-down Switching Regulators with Built-in Power MOSFET

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Fabricant	ROHM [Rohm]

Site Internet	http://www.rohm.com

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Technical Note

Reference data

Fig.1 Output reference voltage vs.

Ambient temprature(All series)

Fig.2 Frequency vs. Ambient

temperature(All series)

Fig.3 Standby current(BD9781HFP)

Fig.5 Standby current(BD9001F)

Fig.6 Circuit current(BD9781HFP)

Fig.8 Circuit current(BD9001F)

Fig.9 ON resistance VIN=5V(BD9781HFP)

Fig.11 ON resistanceVIN=13.2V (BD9781HFP)

0.980

0.985

0.990

0.995

1.000

1.005

1.010

1.015

1.020

-25

-50

0

25

50

75

100

AMBIENT TEMPERATURE : Ta[

]

125

0

100

200

300

400

500

600

-25

-50

0

25

50

75

100

AMBIENT TEMPERATURE : Ta[

]

125

910kΩ

91kΩ

390kΩ

39kΩ

0

1

2

3

4

5

6

7

8

9

10

5

010

15

20

25

30

40

INPUT VOLTAGE : VIN[V]

35

125

VCC=12V

Istb=0.14µA

25

125

25

–40

-40

Fig.7 Circuit current(BD9778F/HFP)

1

0

5

010

15

20

25

30

40

INPUT VOLTAGE : VIN[V]

35

2

3

4

-40

25

125

-40

25

125

1

0

5

010

15

20

25

30

40

INPUT VOLTAGE : VIN[V]

35

2

3

4

Fig.10 ON resistance VIN=7V (BD9781HFP)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.5

0.0

1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

OUTPUT CURRENT : IO[A]

Ta=25

Ta=125

Ta=-40

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

0.5

0.0

1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

OUTPUT CURRENT : IO[A]

Ta=25

Ta=125

Ta=-40

4.5

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0.5

0.0

1.0 1.5 2.0 2.5 3.0 3.5 4.0

OUTPUT CURRENT : IO[A]

Ta=25

Ta=125

Ta=-40

Fig.4 Standby current(BD9778F/HFP)

5

010

15

20

25

30

40

35

INPUT VOLTAGE : VIN[V]

0

1

2

3

4

5

6

7

8

9

10

125

25

-40

VCC=12V

Istb=0.14µA

60

50

40

30

20

10

0

10

20

30

40

50

40

30

20

10

0

1

2

3

4

125

-40

25

Fig.12 ON resistance VIN=5V (BD9778F/HFP)

OUTPUT CURRENT : IO[A]

0.5

0.0

1.0

1.5

2.0

2.5

Ta=-40

Ta=25

Ta=125

2010.02 -

Rev. B

www.rohm.com

BD9778F, BD9778HFP, BD9001F, BD9781HFP

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