LTC4076EDD Dual Input Li-Ion/Polymer Battery Charger

The LTC4076EDD from Linear Technology is a versatile and compact dual-input lithium-ion/polymer battery charger integrated circuit designed for portable electronic applications. This efficient device is capable of charging a single-cell lithium-ion/polymer battery from either a USB port or an AC adapter. The LTC4076EDD stands out with its small form factor, encapsulated within a 10-lead (3mm × 3mm) DFN package, which is ideal for space-constrained applications.

One of the key features of the LTC4076EDD is its ability to automatically select the appropriate power source (USB or AC adapter) without the need for external control pins. When connected to a USB port, the charger adheres to USB current limits, and when an AC adapter is detected, it can utilize higher charge currents, up to a maximum of 1.5A, to expedite the charging process.

The device offers a range of safety features to ensure the longevity and reliability of the battery. These include thermal regulation to maximize the charge rate without the risk of overheating, and a programmable charge termination timer for additional safety. Furthermore, the LTC4076EDD is equipped with automatic recharge, which initiates a new charging cycle if the battery voltage falls below a preset threshold, ensuring the battery remains fully charged.

To accommodate various battery chemistries and capacities, the LTC4076EDD provides programmable charge current through a single resistor. Additionally, it features a charge current monitor, allowing for real-time observation of the charging activity. This is particularly useful for applications that require battery charge status monitoring or for implementing a fuel gauge function.

Overall, the LTC4076EDD is a highly integrated solution for battery charging in portable devices, offering ease of use, flexibility, and safety for designers looking to streamline their power management systems. Its combination of dual-input capability, compact packaging, and comprehensive protection features makes it an excellent choice for a wide range of portable electronic devices.