KIT34675EPEVBE

The Evaluation Kit features the 34675, which is a high input voltage Li-Ion battery charger with a 4.85V/10mA linear regulator. The high input voltage, up to 28V, eliminates the input over-voltage protection circuit required in handheld devices such as cell phones, Bluetooth accessories, and portable media players. The 4.85V linear regulator is capable of 10mA output current, and can be used to directly power a sub-system such as USB transceivers. The charge cycle of the 34675 includes trickle , constant-current (CC), and constant-voltage (CV) charge modes. The CC-mode current is programmable up to 1A with an external resistor. The constant voltage is fixed at 4.2V with 0.7% accuracy over a -40°C to 85°C temperature range. The trickle-mode current is pre-set to 20% of the CC-mode current, when the battery voltage is lower than the trickle-mode threshold. The end-of-charge (EOC) current threshold is pre-set to 10% of the CC-mode current to save the board space and cost. A charge-current thermal-foldback feature limits the charge current when the IC internal temperature rises to the pre-set threshold of 120°C. The 34675 also protects the system with its input over-voltage protection (OVP) feature. Two indication pins (PPR and CHG) can be simply interfaced to a microprocessor or LEDs. When no power supply is connected, or when disabled, the charger draws less than 1.0µA leakage current from the battery.