The **FP0705R2-R22-R** is a high-current, shielded drum core power inductor manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It is part of the FP0705 series, designed specifically for multi-phase Voltage Regulator Modules (VRMs) and high-density power applications. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's specifications: | Segment | Meaning | Detail | | :--- | :--- | :--- | | **FP** | Series Name | Flat-Pac (High current, low profile) | | **0705** | Dimensions | Approx. 7.0mm x 7.0mm x 5.0mm | | **R2** | Version/Revision | Series 2 (optimized for efficiency) | | **R22** | Inductance Value | 0.22 µH (Microhenries) | | **-R** | RoHS Compliant | Lead-free and environmentally compliant | --- ### 2. Technical Specifications This inductor is characterized by its extremely low DC resistance (DCR) and high saturation current. | Parameter | Value | | :--- | :--- | | **Inductance (OCL)** | 220 nH (0.22 µH) ±10% | | **Full Load Inductance** | ~163 nH @ $I_{sat}$ | | **Rated Current ($I_{rms}$)** | 43 Amps (based on temperature rise) | | **Saturation Current ($I_{sat}$)** | 65 Amps (at 25°C) | | **DC Resistance (DCR)** | 0.465 mΩ (Typical) | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Key Features & Construction * **Shielded Construction:** The inductor is magnetically shielded to minimize Electromagnetic Interference (EMI), which is critical in densely packed server boards. * **Ferrite Core Material:** Uses high-frequency ferrite material that ensures low core losses at switching frequencies up to 2 MHz. * **Surface Mount (SMT):** Designed for automated pick-and-place assembly. * **High Power Density:** Provides one of the highest current ratings for its physical footprint (7x7mm). --- ### 4. Typical Applications The FP0705R2-R22-R is typically found in high-performance computing environments where power efficiency and space are at a premium: 1. **Multi-phase VRMs/Vcore:** Supplying power to CPUs, GPUs, and ASICs in servers. 2. **Point-of-Load (POL) Converters:** Step-down regulation for telecommunications equipment. 3. **Data Centers:** Distributed power systems and high-current DC-DC converters. ---