BD8964FVM(2009) View Datasheet(PDF) - ROHM Semiconductor
Part Name
Description
MFG CO.
BD8964FVM
(Rev.:2009)
(Rev.:2009)
ROHM Semiconductor
BD8964FVM Datasheet PDF : 14 Pages
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BD8964FVM
Technical Note
●BD8964FVM Cautions on PC Board layout
VCC
RITH
③
CITH
1 ADJ
2
VCC
3 ITH
4
GND
EN 8
EN
7
PVCC
SW 6
L
5
CIN
Co
PGND
②
①
VOUT
Fig.32 Layout diagram
GND
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 near as possible with least necessary wiring.
●Recommended components Lists on above application
Symbol
Part
Value
Manufacturer
Series
L
Coil
4.7μH
Sumida
TDK
CMD6D11B
VLF5014AT-4R7M1R1
CIN Ceramic capacitor
10μF
Kyocera
CM316X5R106K10A
CO Ceramic capacitor
10μF
Kyocera
CM316X5R106K10A
CITH Ceramic capacitor
1000pF
murata
GRM18series
VOUT=1.0V
4.3kΩ
ROHM
MCR10 4301
RITH Resistance
VOUT=1.2V
VOUT=1.5V
6.8kΩ
9.1kΩ
ROHM
ROHM
MCR10 6801
MCR10 9101
VOUT=1.8V
12kΩ
ROHM
MCR10 1202
* 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.
●I/O equivalence circuit
・EN pin
・SW pin
PVCC PVCC
PVCC
EN
SW
・ADJ pin
VCC
ADJ
10kΩ
・ITH pin
ITH
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© 2009 ROHM Co., Ltd. All rights reserved.
Fig.33 I/O equivalence circuit
11/13
VCC
2009.05 - Rev.A
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