The **FP1109-R58-R** is a high-current, magnetically shielded power inductor typically used in DC-DC converters and voltage regulator modules (VRMs). It is manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). ### 1. Technical Specifications The following table summarizes the key electrical and physical characteristics of the FP1109-R58-R: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.58 µH (±10%) | | **Rated Current (Irms)** | 22 Amps | | **Saturation Current (Isat)** | 26 Amps | | **DC Resistance (DCR)** | 1.15 mΩ (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Dimensions** | 11.0mm x 8.0mm x 9.0mm | --- ### 2. Key Features and Construction * **Magnetically Shielded:** The part is designed to minimize Electromagnetic Interference (EMI), making it suitable for high-density boards where components are placed close together. * **High Power Density:** Its vertical design allows for a small footprint on the PCB while maintaining high current handling capabilities. * **Ferrite Core Material:** Utilizes a ferrite core which provides low core losses, especially in high-frequency switching applications. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and compliant with RoHS standards. --- ### 3. Common Applications Due to its high current rating and low DCR, the FP1109-R58-R is found in: 1. **Multi-phase Regulators:** Used in CPU/GPU power delivery for servers and workstations. 2. **Point-of-Load (POL) Converters:** Providing stable power to FPGAs and ASICs. 3. **Battery Powered Systems:** Where high efficiency (low heat loss) is critical. 4. **Desktop and Server Motherboards:** Voltage Regulator Modules (VRM). --- ### 4. Interpretation of the Part Number `FP1109-R58-R` * **FP1109:** Product Series (Flat-Pac series, physical size). * **R58:** Inductance value (R58 = 0.58 µH). * **-R:** RoHS compliant.