LP3925 - High Performance Power Management Unit for Handset Applications

LP3925是TI德州仪器公司的一款无产品，LP3925是High Performance Power Management Unit for Handset Applications，本站介绍了LP3925的封装应用图解、特点和优点、功能等，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 - 德州仪器

产品描述

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.

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.

产品特性

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

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