The **LP4040R-R45M** is a high-current, low-profile power inductor typically used in DC-DC converter applications. Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. General Overview The part belongs to the **Molded Power Inductor** category. These are designed using a metal alloy powder core, which allows for high saturation currents and excellent thermal stability in a compact footprint. ### 2. Technical Specifications | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 0.45 µH | | **Tolerance** | ±20% (indicated by 'M') | | **Case Size** | 4040 (approx. 4.0mm x 4.0mm) | | **Saturation Current (Isat)** | Typically 10A - 15A (depending on manufacturer) | | **DC Resistance (DCR)** | Very Low (typically <10 mΩ) | | **Core Material** | Carbonyl Powder / Metal Alloy | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Part Number Breakdown The nomenclature usually follows this logic: * **LP**: Series prefix (Low Profile / Power Inductor). * **4040**: Physical dimensions (Length 4.0mm x Width 4.0mm). * **R**: Shielding/Construction type (often refers to RoHS compliant or Resin shielded). * **R45**: Inductance value (R acts as a decimal point, so 0.45µH). * **M**: Tolerance code (M = ±20%). --- ### 4. Key Electronic Features * **Magnetic Shielding:** The molded construction provides inherent shielding, which reduces Electromagnetic Interference (EMI) to surrounding components. * **Soft Saturation:** Unlike ferrite inductors, these metal alloy cores do not "crash" when current exceeds the limit; the inductance drops gradually. * **Low DCR:** It uses thick copper wire to minimize power loss through heat (Jule heating), making it highly efficient. * **High Frequency Performance:** Optimized for switching frequencies ranging from 100 kHz up to 5 MHz. --- ### 5. Common Applications Due to its high current handling and small size, the LP4040R-R45M is commonly found in: 1. **Voltage Regulator Modules (VRMs):** Powering CPUs and GPUs. 2. **Smartphones & Tablets:** Slim profile power management circuits. 3. **DC/DC Converters:** Point-of-Load (POL) power supplies. 4. **SSD Drives:** High-speed data storage power rails.