BD8961NV-E2 Ver la hoja de datos (PDF) - ROHM Semiconductor

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BD8961NV-E2

Low Noise High Efficiency Step-down Switching Regulator with Built-in Power MOSFET

ROHM Semiconductor 

BD8961NV

Technical Note

●BD8961NV Cautions on PC Board layout

VCC

RITH

③

CITH

1 VOUT

2

VCC

3 ITH

4

GND

EN 8

EN

7

PVCC

SW 6

L

5

CIN

Co

PGND

②

①

VOUT

Fig.32 Layout diagram

GND

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 near as possible with least necessary wiring.

※ SON008V5060 (BD8961NV) has thermal FIN on the reverse of the package.

The package thermal performance may be enhanced by bonding the FIN to GND plane which take a large area of PCB.

●Recommended components Lists on above application

Symbol

Part

Value

Manufacturer

Series

L Coil

2.2uH

TDK

LTF5022-2R2N3R2

CIN Ceramic capacitor

22uF

Kyocera

CM32X5R226M10A

CO Ceramic capacitor

22uF

Kyocera

CM316B226M06A

CITH Ceramic capacitor

680pF

murata

GRM18 Serise

RITH Resistance

12kΩ

Rohm

MCR03Serise

*The parts list presented above is an example of recommended parts. Although the parts are sound, actual circuit characteristics should be checked on your

application carefully before use. Be sure to allow sufficient margins to accommodate variations between external devices and this IC when employing the

depicted circuit with other circuit constants modified. Both static and transient characteristics should be considered in establishing these margins. When

switching noise is substantial and may impact the system, a low pass filter should be inserted between the VCC and PVCC pins, and a schottky barrier diode

established between the SW and PGND pins.

●I/O equivalence circuit

・EN pin

・SW pin

PVCC PVCC

PVCC

EN

SW

・VOUT pin

VCC

VOUT

10kΩ

・ITH pin

ITH

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

Fig.33 I/O equivalence circuit

11/13

VCC

2010.04 - Rev.B

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