BD9134MUV_0909 Datasheet, PDF (14/18 Pages) Rohm – Output 2A or More High-efficiency Step-down Switching Regulator with Built-in Power MOSFET

BD9134MUV
●BD9134MUV Cautions on PC Board layout
Technical Note
Fig.33 Layout diagram
① Lay out the input ceramic capacitor CIN closer to the pins PVCC and PGND, and the output capacitor Co closer to the
pin PGND.
② Lay out CITH and RITH between the pins ITH and GND as neat as possible with least necessary wiring.
※ VQFN020V4040 (BD9134MUV) 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.
●Recommended components Lists on above application
Symbol
Part
L Coil
CIN
CO
CITH
RITH
Cf
Rf
Ceramic capacitor
Ceramic capacitor
Ceramic capacitor
Resistance
Ceramic capacitor
Resistance
Value
2.0uH
2.2uH
22uF
22uF
1500pF
5.1kΩ
1000 pF
10Ω
Manufacturer
Sumida
Sumida
Murata
Murata
Murata
Rohm
Murata
Rohm
Series
CDR6D28MNP-2R0NC
CDR6D26NP-2R2NC
GRM32EB11A226KE20
GRM31CB30J226KE18
GRM18 Serise
MCR03 Serise
GRM18 Serise
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 or snubber established between the SW and PGND pins.
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14/17
2009.09 - Rev.B