LP3910数据手册集成电路（IC）的电源管理-专用规格书PDF

描述 Description

The LP3910 is a programmable system power management unit optimized for HDD-based portable media players. The device incorporates two low-dropout LDO voltage regulators, two integrated buck DC-DC converters with dynamic voltage scaling (DVS), one wide load-range buck-boost DC-DC converter with programmable output voltage, a 4-channel, 8-bit ADC, and a dual-source lithium-ion or lithium-polymer battery charger.
The LP3910 also incorporates some advanced battery management functions such as battery temperature measurement, reverse current blocking for USB, LED-charger status indication, thermally regulated internal power FETs, battery-voltage monitoring, overcurrent protection, and a 10-hour safety timer. The device is programmable through a 400-kHz I2C-compatible interface.
The LP3910 is available in a thermally-enhanced 6-mm × 6-mm × 0.8-mm 48-pin WQFN package.
For all available packages, see the orderable addendum at the end of the data sheet.

特性 Features

• Two Low-Dropout Regulators With Programmable Output Voltages:
• LDO1 for General Purpose Applications
• LDO2 for Low-Noise Analog Applications

• Green and Red LED-Charger Status Drivers
• 4-Channel 8-Bit Dual Slope Analog-to-Digital (ADC) Converter
• 2 High-Efficiency DVS Buck Converters
• Wide Load Range Buck-Boost DC-DC Converter
• 400-kHz I2C-Compatible Interface
• Linear Constant-Current and Constant-Voltage Charger for Single-Cell Lithium-Ion Batteries
• USB and Adapter Charging
• System Power Supply Management
• Voltage and Thermal Supervisory Circuits
• Continuous Battery Voltage Monitoring
• Interrupt Request Output With 8 Sources
• 50-mΩ Battery Path Resistance
• 100-mA to 1000-mA Full-Rate Charge Current Using Wall Adapter
• Selectable 0.05C and 0.1C End-of-Charge (EOC) Current
• USB Current Limits of 100, 500, and 800 mA
• USB Pre-Qualification Current of 50 mA
• Selectable 4.1-V, 4.2-V or 4.38-V Battery-Termination Voltages
• 0.35% Battery-Termination Accuracy
• ±1 LSB INL/DNL on 8-Bit ADC