BD9102FVM, BD9104FVM, BD9106FVM

Technical Note

14/17

www.rohm.com

2009.05 - Rev.A

© 2009 ROHM Co., Ltd. All rights reserved.

●

BD9102FVM, BD9104FVM, BD9106FVM Cautions on PC Board layout

Fig.57 Layout diagram

①

For the sections drawn with heavy line, use thick conductor pattern as short as possible.

②

Lay out the input ceramic capacitor CIN closer to the pins PVCC and PGND, and the output capacitor Co closer to the pin

PGND.

③

Lay out CITH and RITH between the pins ITH and GND as neat as possible with least necessary wiring.

Table1.Recommended parts list of application [BD9102FVM]

symbol

part

value

manufacturer

series

L

Inductor

4.7μH

Sumida

CMD6D11B

Ceramic capacitor

10μF

Kyocera

CM316X5R106M10A

Ceramic capacitor

10μF

Kyocera

CM316X5R106M10A

Ceramic capacitor

330pF

murata

GRM18series

Resistor

30kΩ

ROHM

MCR10 3002

Table2. Recommended parts list of application [BD9104FVM]

symbol

part

value

manufacturer

series

L

Inductor

4.7μH

Sumida

CMD6D11B

Ceramic capacitor

10μF

Kyocera

CM316X5R106M10A

Ceramic capacitor

10μF

Kyocera

CM316X5R106M10A

Ceramic capacitor

330pF

murata

GRM18series

Resistor

51kΩ

ROHM

MCR10 5102

Table3.Recommended parts list of application [BD9106FVM]

symbol

part

value

manufacturer

series

L

Inductor

4.7μH

Sumida

CMD6D11B

Ceramic capacitor

10μF

Kyocera

CM316X5R106M10A

Ceramic capacitor

10μF

Kyocera

CM316X5R106M10A

Ceramic capacitor

750pF

murata

GRM18series

Vout[V]

1.0

18kΩ

1.2

22kΩ

1.5

22kΩ

1.8

27kΩ

2.5

36kΩ

*BD9106FVM: As the resistance recommended for RITH depends on the output voltage, check the

output voltage for determination of resistance.

8

7

6

5

1

2

3

4

ITH

EN

GND

SW

PGND

GND

L

①

③

EN

②