BD9111NV_09 Datasheet, PDF (11/14 Pages) Rohm – Output 2A or More High Efficiency Step-down Switching Regulator with Built-in Power MOSFET

BD9111NV
Technical Note
●BD9111NV 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.33 Layout diagram
GND
①For the sections drawn with heavy line, use thick conductor pattern as short as possible.
②Lay out the input ceramic capacitor CIN closer to the pins PVCC and PGND, and the output capacitor Co closer to
the pin PGND.
③Lay out CITH and RITH between the pins ITH and GND as near as possible with least necessary wiring.
※SON008V5060 (BD9111NV) 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
L
Coil
2.2uH
CIN Ceramic capacitor
22uF
CO Ceramic capacitor
22uF
CITH Ceramic capacitor
680pF
RITH Resistance
12kΩ
Manufacturer
TDK
Kyocera
Kyocera
murata
Rohm
Series
LTF5022-2R2N3R2
CM32X5R226M10A
CM316B226M06A
MCH03Serise
* 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
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
Fig.34 I/O equivalence circuit
11/13
VCC
2009.05 - Rev.A