LiPo battery charger, protector and 5V booster based on the IP5306 featuring: - synchronous switch-mode charging with up to 2.1A / 91% efficiency, - discharging with up to 2.4A, - 5V boost converter with up to 92% efficiency, - integrated power-path management (charging battery and 5V output at the same time), - voltage based fuel gauge indication with 4 LEDs, - on/off key, - smart load detector (switching to standby mode automatically), - less than 100uA standby current, - charging/boosting with a single inductor, - output over-current, over-voltage, short-circuit protection, - input over-voltage, over-current protection, - battery over-charge, over-drain, over-current protection, - thermal shutdown. Key functions: - If button is pushed longer than 30ms but shorter than 2s, IP5306 will identify the action as short push. Short push will activate state of charge (SOC) indicator LEDs and step-up converter. - If two short pushes are detected within 1s, IP5306 will deactivate step-up converter, SOC indicator LEDs and PWR LED (flashlight). - If button is pushed longer than 2s, IP5306 will identify the action as long push. Long push will enable or disable PWR LED (flashlight). - If button is pushed shorter than 30ms, IP5306 will ignore the action.    This work is licensed under Creative Commons Attribution-ShareAlike 3.0 Unported License. (http://creativecommons.org/licenses/by-sa/3.0/)