USB375x
USB 2.0 Protection IC with Battery
Charger Detection
Features
•
VBUS
Over-Voltage Protection
- Protects internal circuits from VBUS up to 9V
- Over-Voltage/Under-Voltage Lockout opens
VBUS switch
- Interrupt to indicate Over-Voltage/Under-Volt-
age Lockout
- Integrated Low R
DSON
FET
• USB Port ESD Protection (DP/DM/VBUS)
- ±15kV (air discharge)
- ±15kV (contact discharge)
- IEC 61000-4-2 level 4 ESD protection without
external devices
• High Speed USB Mux for multiplexing the USB
lanes between different functions (USB3750 only)
- Switch the USB connector between two dif-
ferent functions
- High bandwidth USB switch passes HS USB
signals
• Provides USB Battery Charger Detection for:
- USB-IF Battery Charging compliant Dedi-
cated Charging Ports (DCP)
- USB-IF Battery Charging compliant Charging
Downstream Port (CDP)
- Standard Downstream Port (SDP); i.e. USB
host or downstream hub port
- Dedicated SE1 type chargers
• Dead Battery Provision Support (USB375x-1
only)
- Allows 100 mA trickle charging from VBUS
when attached to a Standard Downstream
Port (SDP) while not enumerated
- Built-in 100mA current limiting option
• Microchip RapidCharge Anywhere™ Provides:
- 3-times the charging current through a USB
port over traditional solutions
- USB-IF Battery Charging 1.2 compliance to
any portable device
- Charging current up to 1.5Amps via compati-
ble USB host or dedicated charger
- Dedicated Charging Port (DCP), Charging
(CDP) & Standard (SDP) Downstream Port
support
• flexPWR
®
Technology
- Extremely low current design ideal for battery
powered applications
- Maximizes power delivered to the system
• Industrial Operating Temperature -40°C to +85°C
• 16-Pin QFN RoHS compliant package; (3.0 mm x
3.0 mm x 0.9 mm height
USB375x Block Diagram
HS Switch is USB3750 feature only
VBUS
DP_2
USB Connector
DP
ESD Protection
DP
DM
DM_2
HS USB
Switch
USB 2.0 PHY,
Processor, or
Accessory
DM
DP_1
DM_1
DP
DM
VBUS
USB 2.0 PHY,
Processor, or
Accessory
VBUS
Over-Voltage/Under-Voltage
Protection and Current
Limiting
VOUT
VBUS
Battery
Charger/
PMU
GND
Charger
Detection
I
2
C
Interface
SCL
SDA
INT_B
Processor
2011 - 2014 Microchip Technology Inc.
DS00001824A-page 1
USB375x
TO OUR VALUED CUSTOMERS
It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip
products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and
enhanced as new volumes and updates are introduced.
If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via
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We welcome your feedback.
Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for cur-
rent devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the
revision of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a particular device, please check with one of the following:
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• Your local Microchip sales office (see last page)
When contacting a sales office, please specify which device, revision of silicon and data sheet (include -literature number) you are
using.
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Register on our web site at
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to receive the most current information on all of our products.
DS00001824A-page 2
2011 - 2014 Microchip Technology Inc.
USB375x
Table of Contents
1.0 Introduction ..................................................................................................................................................................................... 4
2.0 Pin Layout ....................................................................................................................................................................................... 5
3.0 Electrical Specifications .................................................................................................................................................................. 7
4.0 General Operation ........................................................................................................................................................................ 12
5.0 Application Notes .......................................................................................................................................................................... 22
6.0 Package Information ..................................................................................................................................................................... 25
Appendix A: Data Sheet Revision History ........................................................................................................................................... 27
The Microchip Web Site ...................................................................................................................................................................... 28
Customer Change Notification Service ............................................................................................................................................... 28
Customer Support ............................................................................................................................................................................... 28
Product Identification System ............................................................................................................................................................. 29
2011 - 2014 Microchip Technology Inc.
DS00001824A-page 3
USB375x
1.0
INTRODUCTION
The USB375x integrates many features that have historically been discrete devices in a mobile product. This device
provides significant VBUS protection for the entire system, robust USB interface ESD protection, a USB 2.0 compliant
High Speed switch, and USB-IF Battery Charger Detection (revision 1.2) capabilities that are essential to the latest
mobile products.
Several advanced features allow the USB375x to be optimized for portable applications and to reduce both eBOM part
count and printed circuit board (PCB) area. Outstanding ESD robustness eliminates the need for external ESD protec-
tion devices.
In addition to the integrated ESD protection on the USB interface, the USB375x provides VBUS Over-Voltage Protection
(OVP).
The USB375x integrated battery charger detection circuitry supports USB-IF Battery Charger Detection. Battery charger
detection will begin automatically whenever VBUS rises above the UVLO threshold, and can also be completed manu-
ally through the I
2
C interface. The USB375x can detect a range of USB battery chargers including a Standard Down-
stream Port (SDP), a Charging Downstream Port (CDP), and a Dedicated Charging Port (DCP). For more information
on USB battery charger detection, please see the USB Battery Charging Specification, Revision 1.2 (Note
1).
The I
2
C interface gives processor control over the USB Switch, charger detection, OVLO settings, and status of the
USB375x. In addition, custom charger detection can be implemented through the I
2
C interface.
The USB375x family is enabled with Microchip's RapidCharge Anywhere
TM
which supports USB-IF Battery Charging
1.2 for any portable device (Note
1).
RapidCharge Anywhere
TM
provides three times the charging current through a
USB port over traditional solutions which translate up to 1.5 amps via compatible USB host or dedicated charger. In
addition, this provides a complete USB charging ecosystem between device and host ports such as Dedicated Charging
Port (DCP), Charging (CDP) and Standard (SDP) Downstream Ports.
1.1
Reference Documents
• Universal Serial Bus Specification, Revision 2.0
• USB Battery Charging Specification, Revision 1.2 (Note
1)
Note 1:
The device’s Data Contact Detect Timeout parameter does not conform to the USB Battery Charging Spec-
ification. However, this will not affect other factors in charger detection. Refer to
Table 3-2, “Electrical Spec-
ifications,” on page 7
for additional information.
DS00001824A-page 4
2011 - 2014 Microchip Technology Inc.
USB375x
2.0
2.1
PIN LAYOUT
Pin Diagram
The USB375x is available in a QFN (3 x 3 mm) package. The USB3750 pin diagram is detailed in
Figure 2-1.
The
USB3751 pin diagram is detailed in
Figure 2-2.
FIGURE 2-1:
QFN PACKAGE DIAGRAM (USB3750)
DM_1
16
15
14
DP_1
VBUS
VBUS
VBUS
13
DP_2
DM
DP
1
2
3
4
5
6
7
8
12
11
10
9
DM_2
VOUT
VOUT
VOUT
SCL
INT_B
DM
14
SDA
FIGURE 2-2:
QFN PACKAGE DIAGRAM (USB3751)
DM_1
16
15
DP_1
VBUS
VBUS
VBUS
1
2
3
4
5
6
7
8
13
12
11
10
9
NC
DP
GND
NC
VOUT
VOUT
VOUT
SCL
INT_B
SDA
2011 - 2014 Microchip Technology Inc.
GND
DS00001824A-page 5
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