Integrated Li−Ion Charger
NCP1835B is an integrated linear charger specifically designed to
charge 1−cell Li−Ion batteries with a constant current, constant
voltage (CCCV) profile.
Its low input voltage capability, adjustable charge current, ability
to maintain regulation without a battery, and its onboard thermal
foldback make it versatile enough to charge from a variety of wall
adapters. The NCP1835B can charge from a standard wall adapter or
from the USB port. It has been optimized to charge low capacity
batteries such as those found in wireless headsets and flash
memory−based MP3 players.
Features
• Integrated Voltage and Current Regulation
• No External MOSFET, Sense Resistor or Blocking Diode Required
• Charge Current Thermal Foldback
• Integrated Pre−charge Current for Conditioning a Deeply
Discharged Battery
• Integrated End−of−Charge (EOC) Detection
• 1% Voltage Regulation
• 4.2 V Regulated Output Voltage
• Regulation Maintained without a Battery Present
• Programmable Full Charge Current
• Open−Drain Charger Status and Fault Alert Flags
• 2.8 V Output for AC Present Indication and Powering Charging
Subsystems
• Minimum Input Voltage of 2.4 V Allows Use of Current Limited
Adapters
• Automatically Recharging if Battery Voltage Drops after Charging
Cycle is Completed
• Low Profile 3x3 mm DFN Package
• Pb−Free Package is Available
Typical Applications
• Wireless Headsets
• MP3 Players
• USB Appliances
• Battery Operated Devices