●The LP3925 is designed to meet the power management requirements of the latest 3G/GSM/GPRS/EDGE cellular phones. The LP3925 PMU contains a single-input Li-Ion battery charger, 14 low-dropout voltage regulators including 3 wide-input, low-output, regulators, 3 buck regulators, a USB Transceiver, two comparators, two TCXO buffers, SIM level shifter, 12-bit ADC, real time clock, and backup battery charger. Programming is handled via an I2C-compatible high-speed Serial Interface allowing control of program on/off conditions and the output voltages of individual regulators, and to read status information of the PMU.
●It can charge and maintain a single cell Li-Ion battery operating from an AC adapter or USB power source.
●The Li-Ion charger requires few external components and integrates the power FET. Charging is thermally regulated to obtain the most efficient charging rate for a given ambient temperature.
●A built-in Over-Voltage Protection (OVP) circuit at the charger input protects the PMU from input voltages up to +28V eliminating the need for any external protection circuitry.
●Buck regulators have an automatic switch to ECO mode at low load conditions providing very good efficiency at low output currents.
●Buck regulators have an automatic switch to ECO mode at low load conditions providing very good efficiency at low output currents.
●General-type “PERFECT” LDO regulators provide excellent PSRR and ULTRA LOW NOISE, 10 µV typ., ideally suited for supplying voltage to RF section.
●The real-time clock/calendar provides time interval information as well as two programmable alarms.
●To accommodate different baseband requirements, the LP3925 PMU has different default voltage settings and startup sequences. Two general-purpose comparators can be used for detecting external accessories like ear-phones etc. Power conversion and signal level shifting circuits are provided to allow SIM interfacing.
Part 3D Model
