Linear Technology's LTC4054XES5-4.2: Standalone Linear Li-Ion Battery Charger

The LTC4054XES5-4.2 is a highly integrated solution from Linear Technology, designed for the efficient charging of single-cell lithium-ion batteries. This compact, feature-rich device simplifies the implementation of a battery charging system in a variety of applications, ranging from portable consumer electronics to industrial and medical devices.

This advanced charger comes in a small TSOT-23 package, making it an ideal choice for space-constrained applications. It offers a complete charging solution without the need for external MOSFETs, sense resistors, or blocking diodes, thus reducing the overall component count and design complexity.

Key Features:

• Precise Charge Voltage: The LTC4054XES5-4.2 ensures accurate charging by providing a fixed 4.2V output, which is the optimal charging voltage for most lithium-ion batteries.
• Programmable Charge Current: The charge current can be set with a single external resistor, giving designers flexibility to tailor the charging profile to specific battery capacities and thermal constraints.
• Automatic Recharge: To maintain battery charge, the device automatically initiates a recharge cycle when the battery voltage falls below a preset threshold.
• Charge Status Output: An onboard charge status output allows for simple LED indication or interface with a microcontroller to signal when charging is complete or in progress.
• Thermal Regulation: The LTC4054XES5-4.2 includes thermal regulation to maximize the charge rate without the risk of overheating.
• Thermal Protection: Safety is a priority with the LTC4054XES5-4.2, as it features thermal shutdown to prevent damage to the battery or circuitry in extreme temperature conditions.

Applications:

• Portable Devices: Smartphones, Tablets, GPS Units
• Wearable Technology: Fitness Trackers, Smartwatches
• Medical Devices: Patient Monitoring Systems, Portable Diagnostics
• Industrial Equipment: Handheld Instruments, Safety Monitors

With its straightforward integration, robust protection features, and flexible design options, the LTC4054XES5-4.2 from Linear Technology is an excellent choice for any project requiring a reliable and compact lithium-ion battery charging solution.