●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.
● Linear Charger With Single Input
● USB or AC Adapter Input
● Power Routing Switch
● 28-V OVP on the Charger Input
● Three High-Efficiency Synchronous Magnetic Buck Regulators, IOUT 800 mA Each:
● Two Regulators Have DVS Support
● High-Efficiency ECO Mode at Low IOUT
● Auto Mode ECO/PWM Switch
● 28-V OVP on the Charger Input
● 15 LDOs
● 10 General-Type Low-Noise LDOs: 8 x 300 mA, 2 x 80 mA
● Three Wide-Input Low-Output (WILO) LDOs, All Capable of Supplying up to 300 mA
● One Micro-Power LDO With IOUT 30 mA
● One High-Voltage USB LDO
● S/W Controllable Outputs
● Outputs Configurable for Pulldown
● Two Comparators and Two TCXO Buffers
● USB 2.0-Compatible Transceiver (12 Mbps)
● 12-Bit A/D Converter for Battery Management and External Monitoring
● Two Over-Voltage Protected Outputs for USB Transceivers
● Real-Time Clock With Two Alarms
● SIM Card Level Translator
● Three Controllable Current Sinks for Keypad LEDs
● Backup Battery Charger
● Thermal Shutdown With Early Warning Alarm
● Momentary Power Loss detection
● Interrupt Request to Reduce S/W Polling
● 81-Bump DSBGA Package
●## Key Specifications
● Low PMU IQ in Sleep Mode
● 50-mA to 1200-mA Charging Current From AC Adapter
● 3.0-V to 4.5-V Battery Voltage
● 150-mV (Typ) Dropout Voltage on LDOs at 300 mA
● 2% (Typ) Output Voltage Accuracy on LDOs
● Ultra Low Noise (10 µV Typ), Ultra Low IQ, Remote Capacitor General-Type "Perfect" LDOs
● 3% Accurate Buck Regulators up to 90% Efficient
●All trademarks are the property of their respective owners.
Part 3D Model
