INTRODUCTION
The FC4057 is a highly integrated standalone switch mode single-cell Li-Ion battery charger. It utilizes a 1.5MHz synchronous buck converter topology to reduce power dissipation during charging. Low power dissipation, an internal integrated MOSFET and current sense resistor allow a physically small charger that can be embedded in a wide range of space-limited portable applications with high capacity batteries. The single cell charger has a single input that operates from either a USB port or AC wall adapter for a versatile solution.

FEATURES
● 1.5MHz High-Efficiency Switch Mode Charger
● Single Input Mini-USB/Adapter Charger
   – 7V Maximum Input Voltage Rating
   – 5.5 V Maximum Operating Input Voltage
   – Compatible with Current Limited Adapters
● High Integration for Reduced BOM Count and
   Board Space Savings
   – Low RDS(ON) Integrated Power FETs for Up to
      2A Charge Rate
   – Integrated Charge Current Sense Resistor
   – Integrated Reverse Current Blocking Element
● Low Power Dissipation
● Accurate Battery Management Functions
   – 1% Battery Regulation Accuracy
   – 10% Charge Current Accuracy
● Remote Sensing at Battery Terminals
● IDET Blanking
● Programmable Charge Current
   Detection/Termination
● Automatic Recharge
● Complete System Level Protection
   – Input UVLO, Sleep Mode, VIN_DPM, Battery
      Over-voltage Protection(Battery OVP)
   – Reverse Leakage Protection Prevents Battery
      Drainage
   – Hard Short On The Battery Terminals
      Protection
   – High Rate Charge Current Limit
   – Cycle By Cycle Current Limit
   – Thermal Shutdown
   – Voltage Based, NTC Monitoring Input For
      Temperature Qualified Charging
   – Programmable Charge Safety Timer
   – Defective Battery Detection
   – Soft-Start Feature to Reduce Inrush Current
● Status Output for Charging and Faults

APPLICATIONS
● Battery Back-Up Systems
● Tablets and Portable Mobile Internet Devices
● Netbook, Smartbook
● Portable Media Players
● IPod, iPhone, iPad Docking
● Bluetooth speaker & 2.4G Wireless speaker
● Smart Phones
● Portable Data Capture Terminals
● Personal Medical Products
● Portable Instruments
● 3G/4G Wireless Routers