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BM81810MUF-M 데이터시트(PDF) 66 Page - Rohm

부품명 BM81810MUF-M
부품 상세설명  Automotive Panel Power Management IC
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제조업체  ROHM [Rohm]
홈페이지  http://www.rohm.com
Logo ROHM - Rohm

BM81810MUF-M 데이터시트(HTML) 66 Page - Rohm

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TSZ02201-0A3A0AS00510-1-2
© 2020 ROHM Co., Ltd. All rights reserved.
15.May.2020 Rev.001
TSZ22111
• 15 • 001
www.rohm.com
PCB Layout Guide
GND Wiring Pattern
The high current GND (PGND) should be wired thick. To reduce line impedance, the GND lines must be as short and
thick as possible and uses few via. Therefore design at PCB board four layers or above is recommended. (Please use
the middle layer as GND shielding and directly connect each GND.) In the case of two layers or less at PCB board
designs, please enough confirm with the actual model about the heat and the noise with care to a GND wiring.
Switching-Line Wiring Pattern
The wiring from switching line (SW pin) of DC/DC converter to inductor and diode must be as short and thick as
possible. If a wiring is long, ringing by switching increases, and the voltage over the resistance of this IC might be
generated. Please note that switching line does not vary PCB layer.
Switching line and wiring easily affected by noise such as feedback line must be placed separately.
Switching noise spread may cause the lack of operation stability. In case the multi-layer PCB board, please note that a
switching line and a line easily affected by noise or the external components are not adjacent between layers.
Drawing GND shield line between switching line and these lines easily affected by noise is recommended if these lines
are placed close.
Power Supply Voltage Line Wiring Pattern
For power supply voltage (VIN, VINB, VLSO, PAVDD, AVDD, VGH), place smooth capacitor nearby IC pin.
Please note that smooth capacitor does not vary PCB layer.
The figure 105 shows an application circuit on the basis of the basic PCB layout pattern guideline mentioned above.
 Bold line: High current line
 Blue line(two dots and dashed line): Wiring easily affected by noise
 Red line (dashed line): Noise source line such as switching line.
Place smooth capacitor nearby IC pin
D_SW locates it near SW terminal / PAVDD terminal of BM81810MUF-M, and a current loop of SW terminal
••• SBD
••• PAVDD, please become as short as possible.
1
2
3
4
5
7
6
8
EN
SWB
RST
SCL
SDA
PG / LDSW
FAULT
VIN
VDD
AVDD
VCOM
VGL
DRN
CPP1
DRP
VCP
CPP2
VGH
GSOUT
GSIN
VIN
VIN
VIN
AVDD
Θ
WPN
R_RST
L_SWB
C_AVD
C_VDD
C_VINB
C_VIN
C_VCOM
C_VGL
C_DRN
D_VGL
C_VGH
C_DRP2
C_VCP
C_DRP1
R_PG
R_FLT
R_NTC1
R_NTC2
R_NTC3
R_RE
C_LSO
C_REG
(D_SW)
Figure 105. PCB Layout Indications


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