**LTC4079EDD#TRPBF: A High-Efficiency Standalone Li-Ion/Polymer Battery Charger with Automatic Power Path Management**

In the realm of portable electronics and IoT devices, efficient and intelligent battery management is paramount. The **LTC4079EDD#TRPBF** from Analog Devices represents a significant advancement in this field, offering a **high-efficiency, standalone linear battery charger** specifically designed for single-cell Li-Ion and Li-Polymer batteries. Its most distinguishing feature is its integrated **automatic Power Path Management**, which optimizes system performance and battery longevity without requiring external microcontrollers or complex firmware.

The charger operates from an input voltage range of 4.4V to 6V, making it compatible with common USB and 5V wall adapter sources. Its **autonomous operation** is a key benefit; the IC manages the entire charging cycle—preconditioning, constant current, constant voltage, and charge termination—without any software intervention. This simplifies design and reduces both development time and system cost.

The core of its intelligence lies in the **automatic Power Path Management** system. This feature allows the connected device to be powered preferentially from the input source when it is present, simultaneously charging the battery with any remaining available current. This **seamless transition** between power sources ensures that the system load always has priority. If the input current is limited, the power path control gracefully reduces the charge current to ensure the system continues to operate, a critical function for devices that cannot tolerate a system reset during charging. When the input source is removed, the switchover to battery power is instantaneous and glitch-free, guaranteeing uninterrupted device operation.

Furthermore, the LTC4079EDD#TRPBF boasts **high efficiency through low dropout operation**, minimizing heat generation—a common challenge in linear chargers. It offers programmable charge current via a single external resistor and includes vital safety features such as **bad battery detection**, automatic recharge, and an NTC thermistor input for temperature-qualified charging. Its compact DFN package is ideal for space-constrained applications.

**ICGOODFIND:** The LTC4079EDD#TRPBF is an exceptional solution for designers seeking a simple, robust, and fully independent battery charging system. Its integrated power path management eliminates the need for external circuitry to manage system load priorities, making it an ideal choice for a wide range of portable and always-on applications where reliability and simplicity are critical.

**Keywords:** Power Path Management, Standalone Charger, Li-Ion Battery, High-Efficiency, Autonomous Operation.