BD9123MUV_14 Datasheet, PDF (18/28 Pages) Rohm – Synchronous Buck Converter with Integrated FET

BD9123MUV
8. Cautions on PC Board Layout
Datasheet
Figure 40. Layout Diagram
(1) Lay out the input ceramic capacitor CIN close to the pins PVCC and PGND, and the output capacitor Co close to pin
PGND.
(2) Lay out CITH and RITH between the pins ITH and GND as near as possible with least necessary wiring.
Note: VQFN016V3030 has thermal PAD on the reverse of the package.
The package thermal performance may be enhanced by bonding the PAD to GND plane which take a large area of
PCB.
9. Recommended Components Lists on Above Application
Symbol
Part
L
Coil
CIN
Ceramic Capacitor
CO
Ceramic Capacitor
CITH
Ceramic Capacitor
RITH
Resistance
Cf
Ceramic Capacitor
Rf
Resistance
Value
4.7µH
10µF
22µF
1500pF
9.1kΩ
0.1µF
100Ω
Manufacturer
TDK
KYOCERA
KYOCERA
Murata
ROHM
Murata
ROHM
Series
VLF5014S-4R7M1R7
CM316X5R106M10A
CM316B226M06A
GRM18 Series
MCR03 Series
GRM18 Series
MCR03 Series
Note: The parts list presented above is an example of recommended parts. Although the parts are standard, actual circuit
characteristics should be checked carefully on your application 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 or snubber connected between the SW and PGND pins.
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