2/16

Technical Note

Absolute Maximum Ratings(Ta = 25˚C)

Recommended operating range

Electrical characteristics

*1 Should not exceed Pd-value.

*2 Reduce by 44mW/°C over 25°C, when mounted on 2-layer PCB of 70 X 70 X 1.6 mm3.

(PCB incorporates thermal via. Copper foil area on the front side of PCB: 10.5 X 10.5 mm2. Copper foil area on the reverse side of PCB: 70 X 70 mm2)

*3 Reduce by 5.52 mW/°C over 25°C, when mounted on 2-layer PCB of 70 X 70 X 1.6 mm3.

Output switch pin voltage

Output switch current

BD9778F/HFP,BD9781HFP

BD9778F/HFP,BD9781HFP

BD9778F/HFP, BD9001F

BD9001F

BD9001F

BD9781HFP

HRP7

SOP8

Power dissipation

Parameter

Symbol

Unit

A

Limits

5.5

0.69

2

EN/SYNC, EN pin voltage

50

W

-40 ~ +95

-40 ~ +125

-55 ~ +150

˚C

˚C

˚C

Power supply

voltage

Operating temperature

range

36

V

V

V

*1

4

*1

*2

*3

RT, FB, INV pin voltage

Storage temperature range

Maximum junction temperature

7

150

BD9778F/HFP

7 ~ 35

~ 2

6 ~ 100

50 ~ 500

40 ~ 800

Parameter

Operating power supply voltage

Output switch current

Output voltage (ON Duty)

Oscillation frequency

Oscillation frequency set resistance

BD9001F

7 ~ 48

~ 2

6 ~ 100

50 ~ 300

100 ~ 800

BD9781HFP

7 ~ 35

~ 4

6 ~ 100

50 ~ 500

39 ~ 800

Unit

V

A

%

kHz

kΩ

Possible operating range

BD9778F/HFP

5 ~ 35

Parameter

Operating power supply voltage

BD9001F

7 ~ 48

BD9781HFP

5 ~ 35

Unit

V

Circuit current

Standby circuit current

Reference voltage 2

Reference voltage 1

[Error Amp block]

Reference voltage input regulation

Input bias current

Maximum FB voltage

Parameter

Limits

Typ.

Min.

Max.

0.96

-

-

-

Operating output current of overcurrent protection

2

-

Symbol

-1

2.4

70

-

-

82

-

0.8

-

Condition

kHz

* Design assurance

* Design assurance

Output leak current

[SW block]

POWER MOS FET ON resistance

Minimum FB voltage

FB sink current

FB source current

Soft start time

[Oscillator block]

Oscillation frequency

Frequency input regulation

[Enable block]

Threshold voltage

Sink current

-

-5.0

Unit

A

µA

µA

V

%

mA

Ω

µA

V

V

mA

µA

mS

V

µA

%

1.00

3

0.53

4

0.5

-

2.5

120

0.05

5

102

1

1.7

13

0

0

-3.0

1.04

0.98

V

1.00

1.02

4.2

10

0.9

-

-

-

-

170

0.10

-

122

-

2.6

50

30

-0.5

* Not designed to be radiation-resistant.

2010.02 -

Rev. B

www.rohm.com

© 2010 ROHM Co., Ltd. All rights reserved.

BD9778F, BD9778HFP, BD9001F, BD9781HFP