BD9137MUV Datasheet, PDF (12/17 Pages) Rohm – High Efficiency Step-down Switching Regulator

●BD9137MUV Cautions on PC Board layout
Fig.35 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 (BD9137MUV) 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 Ceramic capacitor
CO Ceramic capacitor
CITH Ceramic capacitor
RITH Resistance
Cf
Rf
CBST
Ceramic capacitor
Resistance
Ceramic capacitor
Value
2.0uH
2.2uH
22uF
22uF
VOUT=1.0V
1500pF
VOUT=1.2V
1000pF
VOUT=1.5V
1000pF
VOUT=1.8V
560pF
VOUT=2.5V
560pF
VOUT=1.0V
5.6kΩ
VOUT=1.2V
6.8kΩ
VOUT=1.5V
6.8kΩ
VOUT=1.8V
8.2kΩ
VOUT=2.5V
12kΩ
1000 pF
10Ω
0.1 uF
Manufacturer
Sumida
Sumida
Murata
Murata
Murata
Murata
Murata
Murata
Murata
Rohm
Rohm
Rohm
Rohm
Rohm
Murata
Rohm
Murata
Series
CDR6D28MNP-2R0NC
CDR6D26NP-2R2NC
GRM32EB11A226KE20
GRM31CB30J226KE18
CRM18 Serise
GRM18 Serise
GRM18 Serise
GRM18 Serise
GRM18 Serise
MCR03 Serise
MCR03 Serise
MCR03 Serise
MCR03 Serise
MCR03 Serise
GRM18 Serise
MCR03 Serise
GRM18 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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