LTC4054LES5-4.2 Standalone Linear Li-Ion Battery Charger

The LTC4054LES5-4.2 is a compact, high-efficiency, linear charger for single-cell lithium-ion batteries, produced by Linear Technology. This small and versatile charging solution is designed to simplify the charging process for portable electronic devices.

Key Features

• Optimized for Li-Ion Batteries: The LTC4054LES5-4.2 is specifically designed to charge single-cell lithium-ion batteries, ensuring a full and safe charge every time.
• Preset Charge Voltage: The charge voltage is fixed at 4.2V, which is the optimal charging voltage for most single-cell Li-Ion batteries, ensuring maximum efficiency and battery life.
• Automatic Recharge: To keep the battery at peak capacity, the device automatically initiates a recharge cycle when the battery voltage falls below a set threshold.
• Thermal Regulation: This feature maximizes the charge rate without the risk of overheating, making it safe for use in various environmental conditions.

Charging and Safety Features

• No External MOSFET, Sense Resistor or Blocking Diode Required: Simplifies the design and reduces the external component count, making it ideal for space-constrained applications.
• Constant-Current/Constant-Voltage Operation with Thermal Regulation: Ensures that the battery is charged correctly and safely, maintaining the longevity of the battery.
• Charge Current Programmable with a Single Resistor: Offers flexibility in setting the charge current according to the specific needs of the application.
• Charge Current Monitor: For accurate charge current monitoring, which is useful for determining charge time and the health of the battery.
• Undervoltage Lockout: Prevents the charger from operating with insufficient supply voltage, which could lead to improper charging.
• Automatic Shutdown: The device enters a low current state when the charging cycle is complete, conserving energy and preventing overcharging.

Applications

The LTC4054LES5-4.2 is ideal for portable electronic devices such as smartphones, digital cameras, MP3 players, and Bluetooth headsets. Its small form factor and ease of integration make it an excellent choice for space-sensitive and power-conscious applications.

Overall, the LTC4054LES5-4.2 from Linear Technology represents a reliable, efficient, and user-friendly solution for charging single-cell lithium-ion batteries in a wide range of portable devices.