LTC4069EDC#TRPBF - Linear Technology's Standalone Linear Li-Ion Battery Charger

The LTC4069EDC#TRPBF from Linear Technology is a highly integrated and compact standalone linear battery charger designed specifically for charging single-cell lithium-ion batteries. This advanced charging solution comes in a small, low-profile (2mm x 3mm) DFN package, making it an ideal choice for space-constrained applications such as portable electronic devices, wearables, and IoT gadgets.

One of the key features of the LTC4069EDC#TRPBF is its ability to automatically adjust charging current based on the capabilities of the input supply, which helps prevent overloading USB ports or wall adapters. With an input voltage range of 4.25V to 6.5V, it can accommodate a variety of power sources, including USB ports and external power supplies.

The charger offers a programmable charge current up to 950mA, allowing users to customize the charging speed for different battery capacities. Additionally, it includes a complete constant-current/constant-voltage charge cycle with preconditioning, which ensures that batteries are charged safely and efficiently. The preconditioning feature is particularly important for reviving deeply discharged cells before entering the full charging cycle.

Another significant advantage of the LTC4069EDC#TRPBF is its onboard thermal regulation, which helps to maximize the charge rate without the risk of overheating. This thermal feedback automatically reduces charge current if the internal die temperature approaches a preset threshold, ensuring safe operation under all conditions.

For added convenience, the LTC4069EDC#TRPBF does not require an external sense resistor or blocking diode. Its internal MOSFET architecture eliminates the need for these additional components, further simplifying the design and reducing the overall solution footprint.

The device also features several safety mechanisms, including automatic recharge, charge termination, and a charge status output signal, which can be used to indicate charging progress or completion. In addition, it has built-in protection against overvoltage, short-circuit, and battery temperature faults, providing a robust charging solution for sensitive electronic devices.

In summary, the LTC4069EDC#TRPBF is a versatile and efficient solution for charging single-cell lithium-ion batteries in modern portable applications. Its compact size, ease of integration, and comprehensive set of features make it an excellent choice for designers looking to implement a reliable charging system with minimal external components.