The LP3921 is a fully integrated charger and multi-regulatorunit with a fully differential Boomer audio power amplifier designedfor CDMA cellular phones. The LP3921 has a highspeedserial interface which allows for the integration andcontrol of a Li-Ion battery charger, 7 low-noise low-dropout(LDO) voltage regulators and a Boomer audio amplifier.The Li-Ion charger integrates a power FET, reverse currentblocking diode, sense resistor with current monitor output,and requires only a few external components. Charging isthermally regulated to obtain the most efficient charging ratefor a given ambient temperature.
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