DESCRIPTION
The LTC®4067 is a USB power management and Li-Ion/Polymer battery charger designed for portable battery powered applications. The part controls total current used by the USB peripheral for operation and battery charging. The total input current may be left unregulated, or it may be limited to 20% or 100% of the programmed value up to 1.5A (typically 500mA). Battery charge current is automatically reduced such that the sum of the load current and the charge current does not exceed the programmed input current.

FEATURES
Programmable Input Current Limit:
■ Single Resistor at CLPROG Pin to Set and Monitor Input Current

Battery Charger/Ideal Diode/Controller:
■ 13V Overvoltage Protection
■ Full Featured Battery Charger with 4.2V Float
■ Up to 1.25A Programmable Charge Current
■ Thermal Regulation Maximizes Charge Current Without Risk of Overheating
■ Internal 2 Hour Termination Timer from Onset of Voltage Mode Charging
■ Automatic Load Switchover to Battery Power with Internal Ideal Diode and Drive Output for Optional External MOSFET
■ NTC Thermistor Input
■ Bad Battery Time-Out Detection
■ 4mm × 3mm 12-Lead DFN Package

APPLICATIONS
■ Automatic Battery Charging/Load Switchover
■ Backup Battery Charger
■ Uninterrupted Supplies