Product Overview: LT4054LES5-4.2

The LT4054LES5-4.2 is a state-of-the-art linear charger from Linear Technology designed for single-cell lithium-ion batteries. This compact, high-efficiency charging solution is perfect for portable applications where space and power efficiency are at a premium.

Key Features

• Charging Voltage: The device provides a precise 4.2V end-of-charge voltage with an accuracy of ±1%, ensuring the battery is fully charged without overcharging, which can extend battery life.
• Programmable Charge Current: The charge current is easily programmable with a single external resistor, allowing for customization to suit various battery capacities and desired charge rates.
• Automatic Recharge: The LT4054LES5-4.2 features an automatic recharge function. Once the battery voltage falls below 4.05V, the charging cycle restarts, keeping the battery topped off.
• Thermal Protection: The device includes thermal feedback, which regulates the charge current to limit the temperature rise during operation, enhancing safety and reliability.
• Charge Termination: To preserve energy, the charger terminates the charge cycle when the charge current drops below a preset level after the final float voltage is reached.
• Standby Mode: When the charging is complete, the charger enters a low-current standby mode, reducing the battery drain to a minimum.
• No External Blocking Diode Required: The internal design eliminates the need for an external blocking diode, simplifying the design and saving space.

Applications

The LT4054LES5-4.2 is ideal for a wide range of applications, including:

• Portable Consumer Electronics
• Handheld Instruments
• Medical Devices
• Stand-Alone Chargers
• Embedded Systems

Package and Availability

The LT4054LES5-4.2 is available in a small SOT-23 package, making it an excellent choice for space-constrained applications. Its solid performance and ease of use have made it a popular choice for designers looking to incorporate reliable battery charging in their projects.

For detailed specifications, application notes, and further information, please refer to the official Linear Technology datasheets and product guides.