9/10
© 2021 ROHM Co., Ltd.
No. 64AN082E Rev.001
Oct. 2021
Application Note
BD91N01NUX Function Description
Recommended application parts and its selection
Table 9. Recommended application parts selection
Symbol Name
Contents
Characteristic
Comment/Recommendation
U1
IC
3.0mm×2.0.mm, VSON010X3020
BD91N01NUX
C1
Capacitor
0.1
μF, ≥ 16V, X5R/X7R
C2
Capacitor
1
μF, ≥ 16V, X5R/X7R
C3
Capacitor
1
μF to 10μF, ≥16V, X5R/X7R
USB PD standard specifies the
total capacitance before Q1
turning on as cSnkBulk. Please
adjust the sum of C1 and C3
capacitance within 1
μF to
10
μF.
C4
Capacitor
1
μF to 100μF, ≥16V, X5R/X7R
USB PD standard specifies the
total capacitance after Q1
turning on as cSnkBulkPd.
Please adjust the sum of C1,
C3 and C4 capacitance within
1
μF to 100μF according to the
second stage of a system.
Q1, Q2*
FET
Pch-MOS FET
*For preventing the reverse back current from VSRC, both Q1 and Q2 compose Back-to-Back architecture. Q1 is
only required if the feature is not required.
