LTC4098-1

LTC4098/LTC4098-1 USB Compatible Switching Power Managers/Li-Ion Chargers with Overvoltage Protection FEATURES n Switching Regulator with Bat-Track™ Adaptive Output Control Makes Optimal Use of Limited Power Available from USB Port to Charge Battery and Power Application n Overvoltage Protection Guards Against Damage n Bat-Track External Step-Down Switching Regulator Control Maximizes Efficiency from Automotive, Firewire and Other High Voltage Input Sources n 180mΩ Internal Ideal Diode Plus External Ideal Diode Controller Seamlessly Provide Low Loss PowerPath™ when Input Power is Limited or Unavailable n Preset 4.2V Charge Voltage with 0.5% Accuracy (4.1V for LTC4098-1) n 4.1V Float Voltage (LTC4098-1) Improves Battery Life and High Temperature Safety Margin n Instant-On Operation with Discharged Battery n 700mA Maximum Load Current from USB Port n 1.5A Maximum Charge Current with Thermal Limiting n 20-Lead 3mm × 4mm × 0.75mm QFN Package APPLICATIONS n Media Players n GPS n PDAs n Smart Phones DESCRIPTION The LTC®4098/LTC4098-1 are high efficiency USB PowerPath 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. The LTC4098/LTC4098-1’s internal switching regulator automatically limits its input current for USB compatibility. For automotive and other high voltage applications, the L...