BD9122GUL-E2 Datasheet, PDF (14/19 Pages) Rohm – 2.5V to 5.5V, 0.3A 1ch Synchronous Buck Converter integrated FET

0J3J0AJ00110
Cautions on PC Board Layout
CO
①
VOUT
VCC
R2
②
CIN
L
R1
SW
PVcc
Vcc
ADJ
PGND
GND
EN
ITH
Datasheet
③
CITH
GND
RITH
EN
Fig.35 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.
Recommended Components Lists on Above Application
Symbol
Part
Value
Manufacturer
Series
L Coil
2.2uH
FDK
MIPF2016D2R2
CIN Ceramic capacitor
10uF
murata
GRM188B30J106ME47B
CO Ceramic capacitor
10uF
murata
GRM188B30J106ME47B
VOUT=1.0V
VOUT=1.2V
2200pF
CITH Ceramic capacitor
VOUT=1.5V
murata
GRM15 Series
VOUT=1.8V
VOUT=2.0V
1000pF
VOUT=1.0V
VOUT=1.2V
6.8kΩ
MCR006 6801
RITH Resistance
VOUT=1.5V
ROHM
VOUT=1.8V
VOUT=2.0V
4.7kΩ
MCR006 4701
* 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.
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02.MAR.2012 Rev.001