DESCRIPTION
The LTC®4099 is an I2C controlled high effi ciency USB PowerPath™ controller and full-featured Li-Ion/Polymer battery charger. It seamlessly manages power distribution from multiple sources including USB, a wall adapter and a Li-Ion/Polymer battery.

FEATURES
■ Switching Regulator with Bat-TrackTM Adaptive Output Control Makes Optimal Use of Limited Input Power
■ I2C Port for Optimal System Performance and Status Information
■ Input Overvoltage Protection
■ Bat-Track Control of External Step-Down Switching Regulator Maximizes Efficiency from Automotive and Other High Voltage Sources
■ Instant-On Operation with Low Battery
■ Optional Overtemperature Battery Conditioner Improves High Temperature Battery Safety Margin
■ Ideal Diode Seamlessly Connects Battery When Input Power is Limited or Unavailable
■ Full-Featured Li-Ion/Polymer Battery Charger
■ 1.5A Maximum Charge Current with Thermal Limiting
■ Slew Control Reduces Switching EMI
■ Ultra-Thin (0.55mm) 20-Lead 3mm × 4mm QFN

APPLICATIONS
■ Media Players
■ Portable Navigation Devices
■ Smart Phones
■ Industrial Handhelds
■ Portable Medical Instruments