BD9141MUV Datasheet, PDF(14/19 Page) Rohm – Output 2A or More High-efficiency Step-down Switching Regulator with Built-in Power MOSFET

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BD9141MUV Datasheet, PDF (14/19 Pages) Rohm – Output 2A or More High-efficiency Step-down Switching Regulator with Built-in Power MOSFET

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BD9141MUV

Technical Note

âBD9141MUV Cautions on PC Board layout

CVREG

RITH

â¢

CITH

ADJ

VCC

VREG

ITH

GND

PVCC

PGND

VCC

CIN

â¡

VOUT

GND

Fig.34 Layout diagram

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

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

closer to the pin PGND.

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

â£ The Non connection pin must be left open or connected to GND.

â» VQFN020V4040 (BD9141MUV) 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.

âRecommended components Lists on above application

Symbol

Part

L Coil

CIN Ceramic capacitor

CO Ceramic capacitor

CVREG Ceramic capacitor

CITH Ceramic capacitor

RITH Resistance

Value

4.7uH

22uF

0.1uF

Vo=3.3V

1000pF

Vo=5V

Vo=3.3V

Vo=5V

1000pF

20kÎ©

47kÎ©

Manufacturer

TDK

kyocera

murata

Rohm

Series

RLF7030T-4R7M3R4

CM32X5R226M25A

CM32X5R226M10A

GRM188B31H104KA92

GRM1882C1H102JA01

MCR03 Series

*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.

www.rohm.com

14/18

2009.06 - Rev.A

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