Overview of high input voltage battery charger ICs from Freescale, and discussed its key features and its typical application

6. Key Features Extend battery life and maximize full charge capacity Up to 0.4% battery voltage accuracy over temperature Enable operation with current limited adapter to minimize heat generation. Enables safe operation with any adapters. Guaranteed less than 2.6V falling power on reset (POR) threshold Enhance charging safety and battery cycle life Trickle charge for fully discharged batteries Space efficient and low cost No external MOSFET, blocking diode and current sense resistor required Benefit Product Feature Eliminates the high-input-voltage-protection circuit required in handheld devices 28V maximum voltage for the power input Maximize charge current under space constrained applications. No thermal design required. Charge current thermal fold-back New products without going through fab cycles – fast time to market. Factory-configurable pin-out and feature set done in final phase of manufacturing

8. Internal Block Diagram Pinout Die Temp Current Reference Timer OSC Logic EN Status Indications Input OVP + _ EOC Reference Analog Control Smart Batt Detection + _ + _ VREF NTC Die Temp Die Temp Current Reference Current Reference Timer OSC Timer OSC Logic Logic Control EN Status Indications EN EN Status Indications Input OVP Input OVP + _ EOC Reference + _ EOC Reference Analog Control Analog Control Charge Control Smart Batt Detection Smart Battery Detection + _ + _ VREF NTC + _ + _ VREF NTC