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        (充電芯片)HP4555(耐壓24 帶OVP)

        The HP4555 is a cost-effective, fully integrated high
        input voltage single-cell Li-ion battery charger. The
        charger uses a CC/CV charge profile required by Li-ion
        battery. The charger accepts an input voltage up to
        24V but is disabled when the input voltage exceeds
        the OVP threshold, typically 6.8V, to prevent
        excessive power dissipation. The 24V rating
        eliminates the over-voltage protection circuit
        required in a low input voltage charger.
        The charge current and the end-of-charge (EOC)
        current are programmable with external resistors.
        When the battery voltage is lower than 2.55V, the
        charger preconditions the battery with typically 20%
        of the programmed charge current. When the charge
        current reduces to the programmable EOC current
        level during the CV charge phase, the charging
        process is terminated, and meanwhile an EOC
        indication is provided by the 𝐶𝐻𝐺 ̅
        ̅̅̅̅̅ pin, which is an
        open-drain output. An internal thermal foldback
        function protects the charger from any thermal
        failure. Two indication pins (𝑃𝑃𝑅 ̅
        ̅̅̅̅̅ and 𝐶𝐻𝐺 ̅
        ̅̅̅̅̅ ) allow
        simple interface to a microprocessor or LEDs. When
        no adapter attached, the charger draws less than 1μA
        leakage current from the battery.
        The HP4555 is available in Green DFN-2×2-8L
        packages and is rated between -40to +85
        temperature range.
        Complete Charger for Single-Cell-Li-ion or
        Polymer Batteries
        Integrated Pass Element and Current Sensor
        No External Blocking Diode Required
        Low Component Count and Cost
        Programmable Charger Current
        Programmable End-of-Charger Current
        Charge termination when charge current
        reduces to EOC Current
        Charger Current Thermal Foldback for Thermal
        2.55V Trickle Charge Threshold
        6.8V Input Over-Voltage Protection
        24V Maximum Voltage for the Power Input
        Power Presence and Charge Indications
        Less than 1μA Leakage Current from the
        Battery When No Input Power Attached
        Less than 200uA Supply Current when
        Charging is terminated
        Available in Green DFN-2x2-8L Packages
        IEC62368-1:2018 Certif. No. : CN50455
        Mobile Phones
        Blue-Tooth Devices
        MP3 Players
        Stand-Alone Chargers
        Other Handheld Devices
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