LTC4085EDE#PBF

LINEAR TECHNOLOGY  LTC4085EDE#PBF  芯片, 电池充电器, USB电源管理器, 14DFN

The is an USB Power Manager with ideal diode controller and Li-ion charger designed for portable battery powered applications. The part controls total current used by the USB peripheral for operation and battery charging. Battery charge current is automatically reduced such that the sum of the load current and charge current does not exceed the programmed input current limit. It includes a complete constant-current/constant- voltage linear charger for single cell Li-ion batteries. The float voltage applied to the battery is held to a tight 0.8% tolerance and charge current is programmable using an external resistor to ground. An end-of-charge status output CHRG indicates full charge. Total charge time is programmable by an external capacitor to ground. When the battery drops 100mV below the float voltage, automatic recharging of the battery occurs. Also featured is an NTC thermistor input used to monitor battery temperature while charging.

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Seamless transition between input power sources Li-ion battery, USB and 5V wall adapter

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Load dependent charging guarantees accurate USB input current compliance

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Constant-current/constant-voltage operation with thermal feedback

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Maximize charging rate without risk of overheating

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Selectable 100% or 20% input current limit e.g. 500/100mA

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Battery charge current independently programmable up to 1.2A

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Preset 4.2V charge voltage with 0.8% accuracy

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C/10 charge current detection output

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NTC thermistor input for temperature qualified charging