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© 2021 ROHM Co., Ltd.
No. 64AN082E Rev.001
Oct. 2021
Application Note
BD91N01NUX Function Description
VBUS
CC1
CC2
0 V
5 V
Plug
Attached
SWDRV
OFF
Open
VSRC
0 V
3.67 V
VBUS
Supplying
ON
Connected Range
Pch MOSFET
turns off
completely
Q1
BD91N01NUX
Boot-up
Figure 1. The waveform of VSRC at the bootup time
A measure for Overshoot / Undershoot
voltage at the timing of the connection to
the source.
This product does not take countermeasures against
overshoot / undershoot voltage when powering the
Source device. Please consider it separately on the
system load side.
In addition, since the standard mask is set for the
overshoot / undershoot during the voltage rise and fall
in USBPD, please refer to the USBPD standard manual
(e.g., Chapter 7.1.4,) for more details.
