**LTM4681IY#PBF: A High-Performance Dual 9A or Single 18A µModule Regulator with Digital Interface**

In the realm of power management, the demand for compact, efficient, and intelligent solutions continues to escalate. Addressing this need, the **LTM4681IY#PBF** from Analog Devices stands out as a premier **µModule (micromodule) regulator**, integrating a sophisticated switching DC/DC controller, power FETs, inductors, and supporting components into a single, compact BGA package. This highly integrated design simplifies the complex task of power supply layout, significantly reducing time-to-market while ensuring high reliability and performance.

A defining feature of the LTM4681 is its exceptional flexibility in output configuration. It can be configured as **two independent 9A output channels** or be paralleled to function as a **single, high-current 18A output** rail. This versatility makes it an ideal solution for a wide array of applications, from powering high-performance FPGAs, ASICs, and processors in telecommunications and data center hardware to serving in test and measurement equipment.

Beyond its raw power capabilities, the LTM4681 is distinguished by its advanced **digital interface**, which utilizes an I²C serial bus. This interface allows for real-time monitoring, control, and dynamic adjustment of key parameters. Engineers can digitally **program and margining the output voltage**, monitor input and output currents and voltages, and read the die temperature. This level of programmability and telemetry is critical for implementing advanced power system management strategies, optimizing performance, and enhancing system reliability through predictive monitoring.

The module operates over a wide input voltage range of 4.5V to 16V, supporting outputs as low as 0.5V with excellent line and load regulation. Its high level of integration not only saves valuable PCB space but also minimizes EMI by containing the high-frequency switching loops within the module itself. Furthermore, it includes features for power sequencing and tracking, adding another layer of control for complex multi-rail systems.

**ICGOO**DFIND: The LTM4681IY#PBF is a superior power solution that masterfully combines high power density, configurable multi-phase output, and a comprehensive digital management interface. It effectively bridges the gap between analog power delivery and digital system control, offering designers a robust, space-efficient, and intelligent building block for next-generation electronic systems.

**Keywords:** µModule Regulator, Digital Interface (I²C), High-Current Output, Programmable Power Management, Voltage Margining.