USB
Power Delivery Protection
*e schematic illustrates a possible combination of the solution
products to achieve the stated protection goal and does not constitute
the complete circuit design. Customers should verify actual device
performance in their specic circuits and applications.
1. e Multifuse® products (MF-LSMF300X/24X,
MF-MSMF150/16X, MF-SMDF150) help ensure an
application’s compliance to
A. USB 3.1 (section 11.4.1.1.1) in that a polymer PTC may
be used for overcurrent protection of the DC bus; and
B. UL60950-1 Section 2.5 (Limited Power Source Table 2B)
in that any short circuit current shall be limited to less
than 8 A within 5 seconds.
2. e inductor model SRP6540-100M is part of the DC DC
converter which provides the power levels (proles) as described
in the USB PD 1.0 Standard.
3. e TVS diode arrays (CDDFN10-0524P and
CDDFN10-3324P) provide ESD and Surge Protection to the
Cable Connect Lines (CC1, CC2) and Data Lines of the USB
Port. Customers should evaluate the eects of the capacitance
of the TVS diode arrays on the quality of USB 3.1 data ow in
their specic circuits and applications.
4. Proles 1 and 5 as described are shown for informational
purposes only. is PortNote® Solution is applicable to
proles 2, 3 and 4.
MF-LSMF300/24X
CDDFN10-0524P
CDDFN10-3324P
SRP6540-100M
COPYRIGHT© 2016 • BOURNS, INC. • 1/16 • e/K1569 • “PortNote” is a registered service mark of Bourns, Inc.
“Bourns” and “Multifuse” are registered trademarks of Bourns, Inc. in the U.S. and other countries.
Solution Products
Asia-Pacic: Tel +886-2 256 241 17
Fax +886-2 256 241 16
Bourns® PortNote® solutions provide protection
recommendations for typical port threats.
For more information, go to:
www.bourns.com
or email: protection@bourns.com
Americas: Tel +1-951 781-5500
Fax +1-951 781-5700
EMEA: Tel +36 88 520 390
Fax +36 88 520 211
Objective
e USB Power Delivery Specication enables
the maximum functionality of USB by providing
more exible power delivery along with data
over a single cable. Increased and low power
levels (10-100 W) are delivered with maximum
eciency. e power source must be able to
provide short circuit current limiting to protect
its port from excessive current while at the same
time maintaining the maximum power needed
by the peripheral without accidentally tripping.
is solution provides this protection.
Benet
In addition to providing port protection from
excessive current as mandated by power delivery,
this is a cost-eective solution when compared
to a separate overcurrent protection IC.
Solution
1 Multifuse® PPTC Resettable Fuse:
MF-LSMF300/24X
(Prole 3: 12 V, 3 A; Prole 4: 20 V, 3 A)
1 4-Channel 5.0 V TVS Diode Array:
CDDFN10-0524P
3 4-Channel 3.3 V TVS Diode Arrays:
CDDFN10-3324P
1 High-Current Power Inductor:
SRP6540-100M
Compliance*
UL60950, USB PD 1.0, USB 3.1
Alternate Recommendations
MF-MSMF150/16X or
MF-SMDF150 (Prole 2: 12 V, 1.5 A)
PN-DESIGNKIT-57
Design Kit
Prole V
bus
I
bus
1 5 V 2 A
2
5 V 2 A
12 V 1.5 A
3
5 V 2 A
12 V 3 A
4
5 V 2 A
12 V 3 A
20 V 3 A
5
5 V 2 A
12 V 5 A
20 V 5 A
DC/DC Converter
USB
Host
SRP6540-100M
MF-LSMF300/24X
CDDFN10-0524P
CDDFN10-3324P
CDDFN10-3324P
CDDFN10-3324P
+Vhost
s
r
USB PD
Controller
L1
USB
Connector
V
bus
CC1
CC2
SSRX1
SSTX1
SSRX2
SSTX2
USB 1 Data
USB 2 Data
