The LTC4067EDE#PBF is an USB Power Manager with OVP and Li-ion/polymer 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. With the addition of an external P-channel MOSFET the LTC4067 can withstand voltages up to 13V. It includes a complete constant current/constant voltage linear charger for single cell Li-ion batteries. The float voltage applied to the battery is held to a tight 0.4% tolerance and charge current is programmed using an external resistor to ground. An end-of-charge status output, CHRG, indicates full charge.
Programmable input current limit
Single resistor at CLPROG pin to set and monitor input current battery charger
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
