Datasheet

Technical Note
BD9111NV
11/13
www.rohm.com
2010.04 - Rev.B
© 2010 ROHM Co., Ltd. All rights reserved.
●BD9111NV Cautions on PC Board layout
Fig.33 Layout diagram
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 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 MCR03 Serise
* 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
Fig.34 I/O equivalence circuit
VOUT
V
CC
ITH
GND
EN
PV
CC
SW
PGND
VCC
RITH
GND
C
o
CIN
VOUT
EN
L
CITH
③
①
②
1
2
3
4
8
7
6
5
EN
・EN pin ・SW pin
PVCC
SW
PVCC PVCC
ITH
・ITH pin
VCC
VCC
V
OUT
10kΩ
・VOUT pin