**LTC4124EV#TRMPBF: A 400mA Automatic Resonant Wireless Charger with 2V Li-Ion Battery Management**

The proliferation of Internet of Things (IoT) devices, portable medical equipment, and compact consumer electronics has created a pressing need for robust, efficient, and highly integrated wireless power solutions. The **LTC4124EV#TRMPBF** from Analog Devices stands out as a monolithic full-bridge resonant charger that expertly addresses this need by combining **automatic resonant wireless power reception** with sophisticated **Li-Ion battery management** in a single, compact package.

At its core, the LTC4124 is a complete wireless charging system. It functions as a **high-efficiency automatic resonant receiver**, capable of delivering up to **400mA of charge current** to a single-cell Lithium-Ion or Lithium-Polymer battery. Its operation is based on resonant topology, which offers significant advantages over inductive alternatives, including greater spatial freedom (misalignment tolerance) and higher efficiency across a wider range of conditions. The IC automatically tunes its resonant frequency to match the transmitter, maximizing power transfer without any need for user intervention or complex programming.

A key differentiator of this device is its integrated battery management features. It incorporates a **full-function constant-current/constant-voltage (CC/CV) linear battery charger** with precise ±1% charge voltage accuracy. Critically, it includes a **2V trickle charge function for deeply discharged cells**. This feature is essential for safely recovering batteries that have been drained to a very low voltage, preventing damage and restoring them to a healthy state before initiating a full-speed charge cycle. The charger also provides programmable charge termination based on a C/10 current threshold or an optional timer, alongside standard status indicator outputs.

The system is designed for exceptional ease of use and reliability. It requires very few external components, simplifying design and reducing the overall solution footprint. Built-in protection safeguards against a multitude of fault conditions, including **thermal overload, overvoltage conditions on the input, and reverse battery protection**. This comprehensive suite of safety features ensures long-term reliability for the charger and the battery it services.

**ICGOODFIND**: The LTC4124EV#TRMPBF is an exceptional integrated solution that eliminates the traditional complexity of designing wireless power into space-constrained applications. By merging a high-performance resonant receiver, a 400mA linear charger, and critical battery management/protection into one chip, it provides a reliable, "drop-in" wireless charging endpoint for a vast array of modern portable devices.

**Keywords**: Wireless Power Receiver, Li-Ion Battery Charger, Resonant Charging, Trickle Charge, 400mA Charge Current