The LM3420M5-4.2 is a dedicated lithium-ion battery charge controller integrated circuit (IC) manufactured by the renowned electronics company, Texas Instruments (TI). This precision IC is specifically designed to provide a constant current/constant voltage charge management solution for single-cell lithium-ion batteries, which are widely used in modern portable electronics.

Key Features

• Voltage Regulation: The LM3420M5-4.2 precisely regulates the charging voltage to 4.2 volts, ensuring the lithium-ion battery is charged to its optimal voltage threshold for maximum energy storage and longevity.
• Charge Control: It offers a two-stage charge cycle, which includes a constant current phase followed by a constant voltage phase, providing a safe and efficient charging process.
• Package Type: The device comes in an SOT-23-5 package, which is a small and compact surface-mount package, allowing for space-saving PCB design.
• Protection Features: The IC includes built-in features to protect against overcharging, undercharging, and short-circuiting, enhancing the safety of the charging process and the longevity of the battery.

Applications

The LM3420M5-4.2 is versatile and can be used in a variety of applications that require reliable and efficient battery management. Common applications include:

• Portable consumer electronics such as smartphones, tablets, and digital cameras
• Medical devices and handheld instrumentation
• Wireless communication equipment
• Personal digital assistants (PDAs) and portable gaming systems

Technical Specifications

For engineers and designers seeking a reliable charge controller for their lithium-ion battery-powered projects, the LM3420M5-4.2 from Texas Instruments is an excellent choice, combining precision, efficiency, and a compact form factor.