© Semiconductor Components Industries, LLC, 2017
March, 2017 − Rev. 0
1 Publication Order Number:
NCP4371/D
NCP4371
Qualcomm Quick Charget
3.0 HVDCP Controller
NCP4371 is a USB secondary side fast−charging controller,
supporting Qualcomm Quick Charge 3.0 (QC 3.0) High Voltage
Dedicated Charging Port (HVDCP) Class A and Class B specification.
NCP4371 allows for selection of the output voltage of an AC−DC USB
adapter based on commands from the Portable Device (PD) being
powered. Selecting a higher charging voltage will reduce the charging
current for a given power level resulting in reduced IR drops and
increased system efficiency. Another advantage of QC3.0 is a decreased
battery charging time and a reduced PD system cost thanks to the
ability to select an optimum charging voltage. This eliminates the need
for costly DC−DC converters within the PD. The USB−bus voltage
can be controlled in discreet steps from 3.6 V up to 20 V. The output
current is limited not to exceed maximum allowable power level.
The NCP4371 resides at the secondary (isolated) side of the adapter.
It includes voltage and current feedback regulation eliminating the
need for a shunt regulator such as TL431.
The NCP4371 provides charging current limits down to
VBUS = 2.2 V protecting the portable device from excessive currents
in case of a soft short−circuit condition.
The NCP4371 integrates a safe−discharge circuitry to quickly and
reliably discharge output capacitors in case the USB cable is
unplugged or connected to a 5 V only USB port.
Features
• Supports Qualcomm Quick Charge 3.0 HVDCP Class A/B
• Output Voltage Can be Configured in Discreet Steps from
♦ Class A: 3.6 V up to 12 V
♦ Class B: 3.6 V up to 20 V
• Compatible with USB Battery Charging Specification Revision 1.2
(USB BC1.2)
• Constant Voltage and Constant Current Regulation
• Soft Short−Circuit Current Limitation Down to V
BUS
= 2.2 V
• Removes a Need for the Secondary Side Shunt Regulator such as
TL431
• Output Capacitor Safe−Discharge Circuitry at Cable Unplug
• Fast Dynamic Response
• Built−in Power Limiting Function
• Low Supply Current
• Wide Operating Input Voltage Range: 2.2 V to 28 V
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Typical Applications
• Fast Charging AC/DC Adapters for Smart Phones, Tablets and Other
Portable Devices
www.onsemi.com
SOIC−8
D SUFFIX
CASE 751
1
8
4371XYZW = Specific Device Code
(See Device Options Table)
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
4371XYZW
ALYWG
G
1
8
See detailed ordering, marking and shipping information in the
package dimensions section on page 13 of this data sheet.
ORDERING INFORMATION
MARKING DIAGRAM
PIN CONNECTIONS
(Top View)
VCC
GND
D−
D+
DISCHARGE
DRIVE
ISNS
COMP
