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Technical Note
 
15/18 
www.rohm.com
2009.08 - Rev.A
?2009 ROHM Co., Ltd. All rights reserved.
BD9153MUV 
?SPAN class="pst BD9153MUV-E2_2471427_7">BD9153MUV  Cautions on PC Board layout 
 
 
 
 
Fig.42 Layout diagram
 
 
`   Lay out the input ceramic capacitor CIN closer to the pins PVCC and PGND, and the output capacitor Co closer to
    the pin PGND.
a   Lay out CITH and RITH between the pins ITH and GND as neat as possible with least necessary wiring.
 
; VQFN024V4040 (BD9153MUV) 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.
 
?SPAN class="pst BD9153MUV-E2_2471427_7">Recommended components Lists on above application  
 
Symbol
Part
Value
Manufacturer
Series
L1,2    Coil
2.2礖
TDK     LTF5022-2R2N3R2
CIN1,CIN2 Ceramic capacitor
22礔
Murata    GRM32EB11A226KE20
Cout1,Cout2 Ceramic capacitor
22礔
Murata    GRM31CB30J226KE18
CITH1    Ceramic capacitor
VOUT1=3.3V    680pF     Murata    GRM18 Series
RITH1    Resistance
VOUT1=3.3V    39k&
Rohm    MCR03 Series
CITH2    Ceramic capacitor
VOUT2=1.2V    680pF     Murata    GRM18 Series
RITH2    Resistance
VOUT2=1.2V    12k&
Rohm    MCR03 Series
Cfb    Ceramic capacitor
56pF
Murata    GRM18 Series
M1    Nch MOS FET
-
Rohm    RTF015N03
 
 
;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 BU9153MUV 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.
Silk screen
Top Layer
Bottom Layer
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