Adding power protection functions to handheld devices can help end users avoid unexpected malfunctions and reduce the amount of rework for customer terminal devices. This unique charger front-end circuit offers triple solid protection, ensuring maximum safety when charging handheld devices.
Input overvoltage challenge
    Input overvoltage conditions are caused by steady-state or transient voltage events, such as hot-swappable charging adapters, the use of non-regulated or incorrect adapters, or load transients, etc. The above situation may increase the voltage or put the equipment at a peak voltage, which may cause damage to the host system.
Overcurrent protection for high current input
    If the bus voltage is directly connected from the input to the system, the integrated power management device using a battery charger may experience input overcurrent. In many cases, there is no appropriate protection mechanism to limit the input of excessive current from the adapter to the system.
Battery overvoltage protection
    If single-cell lithium-ion and lithium-polymer batteries are overcharged, exceeding their floating voltage (typically around 4.2V), potential dangers may occur. Therefore, portable designers are now seeking redundant safety mechanisms to ensure battery safety and compliance with relevant standard requirements.
    The front-end protection IC for lithium battery chargers provides protection for the battery during the period of overvoltage caused by power peaks during charging or faulty wall-mounted adapters. This three-level protection significantly enhances the safety of rechargeable handheld electronic devices.