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© Semiconductor Components Industries, LLC, 2013
March, 2013 − Rev. 6
1 Publication Order Number:
NCP1851/D
NCP1851, NCP1851A
Fully Integrated Li-Ion
Switching Battery Charger
with Power Path
Management and USB
On-The-Go Support
The NCP1851 is a fully programmable single cell Lithium−ion
switching battery charger optimized for charging from a USB
compliant input supply and AC adaptor power source. The device
integrates a synchronous PWM controller, power MOSFETs, and the
entire charge cycle monitoring including safety features under
software supervision. An optional battery FET can be placed between
the system and the battery in order to isolate and supply the system.
The NCP1851 junction temperature and battery temperature are
monitored during charge cycle, and both current and voltage can be
modified accordingly through I
2
C setting. The charger activity and
status are reported through a dedicated pin to the system. The input pin
is protected against overvoltages.
The NCP1851 also provides USB OTG support by boosting the
battery voltage as well as providing overvoltage protected power
supply for USB transceiver.
Features
• 1.6 A Buck Converter with Integrated Pass Devices
• Input Current Limiting to Comply to USB Standard
• Automatic Charge Current for AC Adaptor Charging
• High Accuracy Voltage and Current Regulation
• Input Overvoltage Protection up to +28 V
• Factory Mode
• 500 mA Boosted Supply for USB OTG Peripherals
• Reverse Leakage Protection Prevents Battery Discharge
• Protected USB Transceiver Supply Switch
• Dynamic Power Path with Optional Battery FET
• Battery Temperature Sensing for Safe Operation (JEITA)
• Silicon Temperature Supervision for Optimized Charge Cycle
• Safety Timers
• Flag Output for Charge Status and Interrupts
• I
2
C Control Bus up to 3.4 MHz
• Small Footprint 2.2 x 2.55 mm CSP Package
• These Devices are Pb−Free and are RoHS Compliant
Applications
• Smart Phone
• Handheld Devices
• Tablets
• PDAs
MARKING
DIAGRAM
http://onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page 30 of this data sheet.
ORDERING INFORMATION
25 BUMP
FLIP−CHIP
CASE 499BN
XXXX = Specific Device Code
A = Assembly Location
Y = Year
WW = Work Week
G or G = Pb−Free Package
XXXX
AYWW
G
*Pb−Free indicator, “G” or microdot “ G”,
may or may not be present.
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