USB

Power Delivery Protection
Bourns® PortNote® solutions provide protection recommendations for typical port threats.

Objective

Solution Products

The USB Power Delivery Specification enables
the maximum functionality of USB byproviding more flexible power delivery alongwith data over a single cable. Increased andlow power levels (10-100 W) are delivered withmaximum efficiency. The power source must
be able to provide short circuit current limiting
to protect its port from excessive current whileat the same time maintaining the maximum
power needed by the peripheral without
accidentally tripping. This solution provides
this protection.

MF-LSMF300/24X

CDDFN2-T5.0LC

Benefit

In addition to providing port protection fromexcessive current as mandated by power
delivery, this is a cost-effective solution
when compared to a separate overcurrent
protection IC.

CDDFN10-3324P

DC/DC Converters r+Vhost

L1

SRP6540-4R7M

USB PD
Controller

SRP6540-100M

MF-LSMF300/24X
Vbus
CDDFN2-T5.0LC

CC1
CC2

CDDFN2-T5.0LC

Profile12345555

Power (W)
7.5 - 15915 - 27
9 1527 - 45
9 15 20 45 - 100

SSRX1
SSTX1VbusUSBHost

CDDFN10-3324P

CDDFN10-3324P

To order samples, click on the“Request Sample” button online.

USBConnector
SSRX2
SSTX2

USB 1 Data
USB 2 Data

CDDFN10-3324P

Solution

1 Multifuse® PPTC Resettable Fuse:
MF-LSMF300/24X(Profile 2: 9 V, 3 A, Profile 3: 15 V, 3 A)

2 5.0 V TVS Diodes:
CDDFN2-T5.0LC
3 4-Channel 3.3 V TVS Diode Arrays:
CDDFN10-3324P
1 High-Current Power Inductor:
SRP6540-4R7M

Compliance*

UL60950, USB PD 2.0, USB 3.1

Alternate Recommendations
MF-MSMF150/16X orMF-SMDF150 (Profile 2: 12 V, 1.5 A)*The schematic illustrates a possible combination of the solution
products to achieve the stated protection goal and does notconstitute the complete circuit design. Customers should verify
actual device performance in their specific circuits and applications.
1. The Multifuse® products (MF-LSMF300X/24X,
MF-MSMF150/16X, MF-SMDF150) help ensure anapplication’s compliance toA. USB 3.1 (section 11.4.1.1.1) in that a polymer PTC may
be used for overcurrent protection of the DC bus; andB. UL60950-1 Section 2.5 (Limited Power Source Table 2B)in that any short circuit current shall be limited to lessthan 8 A within 5 seconds.
2. The inductor model SRP6540-4R7M is part of the DC/DC
converter which provides the power levels (profiles) as
described in the USB PD 3.0 Standard.
3. The TVS diode array CDDFN10-3324P and TVS diode
CDDFN2T5.0LC provide ESD and surge protection to the Cable
Connect Lines (CC1, CC2) and data lines of the USB port.
Customers should evaluate the effects of the capacitanceof the TVS diode arrays on the quality of USB 3.1 data flow intheir specific circuits and applications.
4. Profile 4 as described is shown for informational purposes
only. This PortNote® Solution is applicable toprofiles 2 and 3.

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