Overview of the Texas Instruments LM3658SDX-B

The LM3658SDX-B is a highly efficient, dual-input USB/AC charger integrated circuit (IC) designed by Texas Instruments (TI) for single-cell lithium-ion or lithium-polymer batteries. This power management solution is ideal for portable devices where space and power efficiency are at a premium.

Key Features

• Dual-Input Operation: The LM3658SDX-B can be powered from a USB port or an AC wall adapter, providing flexibility for charging the battery.
• Automatic Power Source Selection: It automatically selects the appropriate power source (USB or AC) without external user intervention.
• Charge Termination and Preconditioning: The IC includes features for safe charging, such as charge termination based on minimum current, and a preconditioning phase for deeply discharged batteries.
• Thermal Regulation: To ensure reliability, the LM3658SDX-B incorporates a thermal regulation feature that protects the IC and the battery from overheating during the charging process.
• Charge Status Indicators: It provides real-time charge status indicators that can be used to light LEDs, signaling the charge status to the user.

Applications

The LM3658SDX-B is suitable for a variety of applications, including:

• Smartphones and Tablets
• Portable Media Players
• Digital Cameras and Camcorders
• Handheld GPS Units
• Other Portable Devices Requiring Battery Charging

Technical Specifications

• Input Voltage Range: 4.0V to 6.0V (USB), 4.0V to 8.0V (AC Adapter)
• Charging Current: Programmable up to 1 A
• Battery Voltage: 4.2V nominal (fixed)
• Package: 10-pin WSON (3mm x 3mm)
• Operating Temperature: -40°C to +85°C

The LM3658SDX-B offers a compact and comprehensive solution for the power management needs of modern portable devices, ensuring safe and efficient battery charging with minimal external components.