## Technical Overview of FP1109-1R0-R The **FP1109-1R0-R** is a high-frequency, high-current power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the **FP1109 series**, which is designed specifically for high-density power conversion applications. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics: | Parameter | Value | | :--- | :--- | | **Inductance** | 1.0 $\mu$H | | **Tolerance** | ±10% | | **Current Rating (Irms)** | 16 A (Typical) | | **Saturation Current (Isat)** | 20 A (Typical) | | **DC Resistance (DCR)** | 3.32 mΩ (Max) | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 11.0mm x 9.0mm x 9.0mm (SMD) | | **Construction** | Shielded, Ferrite Core | --- ### 2. Core Features * **Flat-Wire Construction:** The "FP" (Flat Pac) series utilizes flat wire technology. This reduces skin effect losses at high frequencies and allows for a lower DCR (Direct Current Resistance) compared to traditional round-wire inductors. * **Magnetic Shielding:** The part is magnetically shielded to minimize EMI (Electromagnetic Interference), making it suitable for densely packed PCB layouts. * **High Saturation:** It is engineered to maintain its inductance even under high peak currents, preventing the core from saturating and losing efficiency. * **Vertical Footprint:** The "1109" designation refers to the 11mm x 9mm footprint, which is optimized for vertical space efficiency in VRM (Voltage Regulator Module) designs. --- ### 3. Common Applications The FP1109-1R0-R is typically used in power management circuits where high efficiency and high current handling are required: 1. **Multi-phase Buck Regulators:** Used in CPU/GPU power supplies for servers and workstations. 2. **Voltage Regulator Modules (VRM):** Essential for step-down conversion in computing environments. 3. **Point-of-Load (POL) Converters:** Providing stable power to FPGAs and ASICs. 4. **High-current DC-DC Converters:** General-purpose industrial power supplies. --- ### 4. Part Number Breakdown The part number can be decoded as follows: `FP1109-1R0-R` * **FP1109:** Product Series and Physical Dimensions (11.0mm x 9.0mm). * **1R0:** Inductance value ($1.0 \mu$H). The "R" acts as a decimal point. * **-R:** Indicates the part is RoHS compliant. ---