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BD9P105MUF-CE2 Folha de dados(PDF) 33 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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© 2019 ROHM Co., Ltd. All rights reserved.
28.Apr.2020 Rev.001
TSZ22111 • 15 • 001
BD9P1x5MUF-C Series
Selection of Components Externally Connected - continued
Selection of Input Capacitor CIN, CBLK
For input capacitors, there are two types of capacitor: decoupling capacitors CIN and bulk capacitors CBLK.
Ceramic capacitors with total values 2.3 µF or more are necessary for the decoupling capacitors CIN for ripple noise
reduction. If a low ESR electrolytic capacitor with large capacitance is connected parallel to the decoupling capacitors as
a bulk capacitor, ceramic capacitors with 0.5 µF or more are necessary for the decoupling capacitors. (However, to
reduce EMI noise level, 2.3 µF or more are recommended for ceramic capacitors.) These capacitor values including
device variation, temperature characteristics, DC bias characteristics, and aging change must be larger than minimum
value. It is effective for switching noise reduction to place one of ceramic capacitor close to the PVIN and the VIN pins.
The voltage rating of the capacitors is recommended to be 1.2 times or more the maximum input voltage, or twice the
normal input voltage. Also, the IC might not operate properly when the PCB layout or the position of the capacitor is not
good. Please check “PCB Layout Design” on page 48.
The bulk capacitor is optional. The bulk capacitor prevents the decrease in the line voltage and serves as a backup
power supply to keep the input voltage constant. A low ESR electrolytic capacitor with large capacitance is suitable for
the bulk capacitor. It is necessary to select the best capacitance value for each of application. In that case, please take
note not to exceed the rated ripple current of the capacitor.
The RMS value of the input ripple current ICIN(RMS) is obtained in the following equation:
����������������(������������) = √
{����������������(������������)2 (1 −
) +
2} [A]
is the output current (Max) [A]
In addition, in automotive and other applications requiring high reliability, it is recommended to connect the capacitors in
parallel to accommodate multiple electrolytic capacitors and minimize the chances of drying up. For ceramic capacitors,
it is recommended to make two series + two parallel structures to decrease the risk of capacitor destruction due to short
circuit conditions.
When the impedance on the input side is high for some reason (because the wiring from the power supply to the VIN pin
is long, etc.), then high capacitance is required. In actual conditions, it is necessary to verify that there are no problems
like IC is turned off, or the output overshoots due to the change in VIN at transient response.

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