DESCRIPTION
The LTC®4098/LTC4098-1 are high efficiency USB Power-Path controllers and full-featured Li-Ion/Polymer battery chargers. They seamlessly manage power distribution from multiple sources including USB, wall adapter, automotive, Firewire or other high voltage DC/DC converters, and a Li-Ion/Polymer battery.

FEATURES
■ Switching Regulator with Bat-TrackTM Adaptive Output Control Makes Optimal Use of Limited Power Available from USB Port to Charge Battery and Power Application
■ Overvoltage Protection Guards Against Damage
■ Bat-Track External Step-Down Switching Regulator Control Maximizes Effi ciency from Automotive, Firewire and Other High Voltage Input Sources
■ 180mΩ Internal Ideal Diode Plus External Ideal Diode Controller Seamlessly Provide Low Loss PowerPathTM when Input Power is Limited or Unavailable
■ Preset 4.2V Charge Voltage with 0.5% Accuracy (4.1V for LTC4098-1)
■ 4.1V Float Voltage (LTC4098-1) Improves Battery Life and High Temperature Safety Margin
■ Instant-On Operation with Discharged Battery
■ 700mA Maximum Load Current from USB Port
■ 1.5A Maximum Charge Current with Thermal Limiting
■ Ultra-Thin (0.55mm) 20-Lead 3mm × 4mm QFN

APPLICATIONS
■ Media Players
■ GPS
■ PDAs
■ Smart Phones