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| BD9853AFV Datasheet, PDF (13/17 Pages) Rohm – Single/Dual-output High-frequency Step-down Switching Regulato (Controller type) | |||
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BD9853AFV
âRecommended Board Patterns
PMOS
CIN
N MOS
L
SBD
VOUT
COUT
GND(IC)
INV
GND(others)
Technical Note
There are two current loops at the behavior of switching regulator. When laying a pattern on the board, put these elements
near to minimize these current loops and make the lines as short and wide as possible. And connect all GND lines at one
point to reduce effects caused by above current noise to other lines.
a pattern example of switching part
COUT
L
SBD
NMOS
P MOS
C IN
Place following parts with attention about patterns
GND
GND
VCC
CREGB
REGB
CVCC
CREGA
RRT
1 VCC
2
3
4 REGA
5 RT
6
7
8
REGB 16
15
14
13
12
11
10
9
ã»Place CVCC, CREGA, RRT, CREGB as near to the pin as possible.
ã»Pattern area has to be small enough to reduce parasitic capacitance with RT terminal.
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
13/16
2009.05 - Rev.A
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