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BD9P105MUF-CE2 Folha de dados(PDF) 48 Page - Rohm

Nome de Peças BD9P105MUF-CE2
Descrição Electrónicos  3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive
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Fabricante Electrônico  ROHM [Rohm]
Página de início  http://www.rohm.com
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BD9P105MUF-CE2 Folha de dados(HTML) 48 Page - Rohm

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© 2019 ROHM Co., Ltd. All rights reserved.
28.Apr.2020 Rev.001
www.rohm.com
TSZ22111 • 15 • 001
BD9P1x5MUF-C Series
TSZ02201-0J1J0AL01500-1-2
PCB Layout Design
PCB layout design for DC/DC converter power supply IC is as important as the circuit design. Appropriate layout can avoid
various problems caused by power supply circuit. Figure 89 (a) to Figure 89 (c) figure the current path in a buck converter
circuit. The Loop1 in Figure 89 (a) is a current path when High Side Switch is ON and Low Side Switch is OFF, the Loop2 in
Figure 89 (b) is when High Side Switch is OFF and Low Side Switch is ON. The thick line in Figure 89 (c) shows the
difference between Loop1 and Loop2. The current in thick line changes sharply each time the switching element High Side
Switch and Low Side Switch change from OFF to ON, and vice versa. These sharp changes induce several harmonics in the
waveform. Therefore, the loop area of thick line that is consisted by input capacitor and IC should be as small as possible to
minimize noise. For more detail, refer to application note of switching regulator series “PCB Layout Techniques of Buck
Converter”.
CIN
High Side Switch
COUT
VOUT
L
VIN
Loop1
Low Side Switch
GND
GND
Figure 89 (a). Current Path when High Side Switch = ON, Low Side Switch = OFF
CIN
COUT
VOUT
L
VIN
Loop2
High Side Switch
Low Side Switch
GND
GND
Figure 89 (b). Current Path when High Side Switch = OFF, Low Side Switch = ON
CIN High Side FET
COUT
VOUT
L
VIN
GND
GND
Low Side FET
Figure 89 (c). Difference of Current and Critical Area in Layout


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