The **LP4040R-R56M** is a high-current, low-profile power inductor typically used in DC-DC converter applications. It is designed to handle high saturation currents while maintaining a small footprint. --- ## Technical Specifications Below are the primary electrical and physical characteristics of the LP4040R-R56M: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 0.56 µH | | **Tolerance** | ±20% (indicated by the 'M') | | **Case Size** | 4040 (approx. 4.0 x 4.0 mm) | | **DCR (DC Resistance)** | Very Low (typically < 10 mΩ) | | **Saturation Current (Isat)** | High (typically 10A - 15A range) | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | --- ## Part Number Breakdown Understanding the nomenclature helps in identifying equivalent components: * **LP**: Series prefix (usually stands for Low Profile/Power). * **4040**: Physical dimensions (4.0mm x 4.0mm). The height varies by manufacturer but is usually around 1.2mm to 2.0mm. * **R**: Often denotes the packaging type (Taped & Reeled) or a specific material revision. * **R56**: The inductance value. "R" acts as a decimal point. $0.56$ microhenries (µH). * **M**: The tolerance code. $M = \pm20\%$. --- ## Key Features & Applications ### Features 1. **Low Core Loss:** Uses composite iron powder or ferrite cores to minimize energy waste at high frequencies. 2. **High Frequency Performance:** Optimized for switching frequencies ranging from 100kHz to over 5MHz. 3. **Shielded Construction:** The molded design reduces Electromagnetic Interference (EMI), protecting nearby sensitive components. ### Common Applications * **Voltage Regulator Modules (VRMs):** Found in laptops and desktop motherboards. * **DC/DC Converters:** Point-of-load (POL) power supplies. * **Portable Electronics:** Smartphones, tablets, and SSDs where space is limited. * **LED Drivers:** Providing stable current for high-brightness lighting. --- ## Typical Footprint Example In a PCB layout, the land pattern for a 4040 size inductor usually follows these dimensions: ```text 4.0 mm <-----------> +-----------+ ^ | [ PAD ] | | | | | 4.0 mm | [ PAD ] | | +-----------+ v ```