Linear Technology LTC4054ESS-4.2 Standalone Linear Li-Ion Battery Charger

The LTC4054ESS-4.2 from Linear Technology is a highly compact, single-cell lithium-ion battery charger that utilizes a constant-current/constant-voltage charge algorithm. Designed to operate from a USB power supply or an external wall adapter, this device is an ideal solution for portable applications where space and simplicity are critical.

Key Features:

• Precise Charge Voltage: The LTC4054ESS-4.2 ensures accurate charge voltage control, typically within ±1%, which is crucial for the longevity and safety of lithium-ion batteries.
• Adjustable Charge Current: Users can set the charge current up to 800mA with a single external resistor, providing flexibility to match the charging requirements of different battery capacities.
• Thermal Regulation: This feature maximizes the charge rate without the risk of overheating, making it safe for use across various environmental conditions.
• Automatic Recharge: The device automatically initiates a new charge cycle when the battery voltage falls below an internal threshold, ensuring the battery remains fully charged.
• No External MOSFET, Sense Resistor, or Blocking Diode Required: The LTC4054ESS-4.2 simplifies the design by eliminating the need for these external components, which reduces the overall system cost and footprint.
• Charge Current Monitor Output: This feature allows for real-time monitoring of the charge current, which can be useful for charge status indication or for implementing a dual-function LED indicator.
• Low Profile (1mm) ThinSOT Package: The device comes in a small SOT-23 package, making it suitable for space-constrained applications.

Applications:

The LTC4054ESS-4.2 is ideal for a variety of portable electronic devices, including:

• Cellular Telephones
• PDAs
• MP3 Players
• Digital Cameras
• USB-Powered Gadgets

With its straightforward pin configuration and minimal external component requirements, the LTC4054ESS-4.2 is an excellent choice for designers seeking a reliable and easy-to-implement charging solution for single-cell Li-Ion batteries.

Overall, the LTC4054ESS-4.2 offers a balance of performance, convenience, and efficiency, making it a versatile charger for modern portable electronics.