Texas Instruments LP3913SQ-AE/NOPB

Description
The LP3913 is a programmable system power management unit optimized for Flash Memory-based Portable Media Players. It incorporates:
- 2 low-dropout LDO voltage regulators
- 3 integrated Buck DC/DC converters with Dynamic Voltage Scaling (DVS)
- 4-channel 8-bit A/D converter
- Dual source Li-Ion/polymer battery charger
The battery charger can charge and maintain a single cell battery from a regulated wall adapter or USB power. When both USB and adapter sources are present, the adapter source takes precedence, and switching between USB and adapter power sources is seamless. The battery charger also supports power routing, allowing system usage immediately after an external power source has been detected.
The LP3913 also incorporates 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
- Over-current protection
- 10-hour safety timer
The 4-channel A/D converter measures the battery voltage and charge current, which can be used for fuel gauging. Two undedicated channels can be used to measure other analog parameters such as discharge current, battery temperature, and keyboard resistor scanning.
The various IC parameters are programmable through a 400 kHz I²C compatible interface.

Features
- 2 Low-Dropout Regulators (LDO1 for general purpose applications, LDO2 for low-noise analog applications)
- Green and Red LED Charger Status Drivers
- 4-Channel 8-Bit Dual Slope A/D Converter
- 3 High-Efficiency DVS Buck Converters
- 400 kHz I²C Compatible Interface
- Linear Constant-Current/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

Applications
- Flash-Based Portable Media Players
- Portable Gaming Devices
- Portable Navigation Systems