**LT8490IUKJ#TRPBF: A Comprehensive Technical Overview of the High-Voltage Buck-Boost Battery Charger IC**

The **LT8490IUKJ#TRPBF** from Analog Devices represents a pinnacle of integration and flexibility for advanced battery charging applications. This monolithic buck-boost switching regulator is engineered to manage a remarkably wide input voltage range from **6V to 80V**, making it an indispensable solution for systems powered by automotive, industrial, solar, or other variable and high-voltage sources. Its ability to seamlessly transition between buck, boost, and buck-boost operating modes ensures **optimal efficiency** regardless of fluctuations in input voltage or battery state, providing a constant-current/constant-voltage (CC/CV) charge profile to a vast array of battery chemistries, including Lithium-Ion/Polymer, SLA, and NiMH/NiCd.

At the core of the LT8490's versatility is its **sophisticated 4-switch buck-boost topology**. Unlike simpler linear or single-mode switchers, this architecture allows the output voltage to be set above, below, or equal to the input voltage. This is critical for applications like automotive systems, where a 12V battery can experience load-dump transients exceeding 60V, yet still need to charge a multi-cell Lithium battery pack at 16.8V. The IC incorporates all necessary active components—including power switches, loop compensation, and a precision battery charger—within a single package, significantly reducing the external component count and design complexity.

Control and programmability are hallmarks of the LT8490. Key charging parameters such as **charge current, float voltage, and termination criteria** are easily set using simple resistor networks or controlled via an I2C interface, offering digital precision and adaptability. The charger supports multiple termination methods, including C/10, timer-based, or a combination of both, enhancing safety and maximizing battery capacity. Furthermore, the device features comprehensive system monitoring and fault protection, including input UVLO, output overvoltage protection, thermal shutdown, and a **battery temperature monitoring** (NTC) input, ensuring reliable and safe operation under adverse conditions.

The LT8490 is presented in a compact 7mm x 7mm 64-lead QFN package (UKJ), designed for robust thermal performance. Its high level of integration, coupled with its wide operating range, makes it ideal for challenging environments such as high-power portable equipment, automotive telematics, robotics, and remote, solar-powered systems where power availability is inconsistent and efficiency is paramount.

**ICGOOFind: The LT8490IUKJ#TRPBF stands out as an exceptionally robust and versatile monolithic solution for high-voltage battery charging. Its unique combination of a wide 6V to 80V input range, advanced 4-switch buck-boost architecture, and highly programmable charge management makes it a superior choice for engineers designing reliable systems for harsh electrical environments, simplifying design while maximizing performance and safety.**

**Keywords:**

1. **Buck-Boost Topology**

2. **High-Voltage Input**

3. **Battery Charger IC**

4. **Constant-Current Constant-Voltage (CC/CV)**

5. **Programmable Charging Parameters**