LP3925是TI公司的一款无产品，LP3925是High Performance Power Management Unit for Handset Applications，本页介绍了LP3925的产品说明、应用、特性等，并给出了与LP3925相关的TI元器件型号供参考。
LP3925 - High Performance Power Management Unit for Handset Applications - 无 - 电源管理多通道IC(PMIC)解决方案 - TI公司（Texas Instruments，德州仪器）
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
