The **L3080L-AB5-R** is a specific part number for a low-dropout (LDO) linear regulator manufactured by **UTC (Unisonic Technologies Co., Ltd)**. It is part of the L3080 series, designed for applications requiring high efficiency and stable voltage regulation. --- ## 1. Technical Specifications | Parameter | Specification | | :--- | :--- | | **Component Type** | CMOS Low Dropout Regulator (LDO) | | **Fixed Output Voltage** | 0.8V to 5.0V (Standard variants, check suffix for specific V) | | **Maximum Output Current** | 300 mA | | **Input Voltage Range** | 2.5V to 6.0V | | **Quiescent Current** | ~60μA (Typical) | | **Dropout Voltage** | ~200mV @ 300mA | | **Package Type** | SOT-89 (AB5 Code) | | **Operating Temperature** | -40°C to +85°C | --- ## 2. Part Number Breakdown Understanding the nomenclature helps identify the exact physical and electrical characteristics: * **L3080**: The base series model (300mA LDO). * **L**: Lead-free / Halogen-free (RoHS compliant). * **AB5**: Refers to the **SOT-89** package type. * **R**: Tape and Reel packaging. --- ## 3. Key Electronic Features ### A. Low Dropout Voltage This part is designed to maintain a stable output even when the input voltage is very close to the output voltage. This minimizes power dissipation and heat, making it ideal for battery-powered devices. ### B. High Ripple Rejection (PSRR) The L3080 series typically features a high Power Supply Rejection Ratio, which filters out high-frequency noise from the input power source, ensuring a clean DC output for sensitive ICs. ### C. Protection Circuitry The device includes internal protection mechanisms: * **Thermal Shutdown:** Protects the IC if the junction temperature exceeds limits. * **Current Limiting:** Prevents damage during a short circuit or overload condition. --- ## 4. Typical Application Circuit To ensure stability, LDOs require external capacitors. Below is the standard configuration: ```text Input (Vin) ----[ C1: 1uF ]----( V_IN [L3080] V_OUT )----[ C2: 1uF ]---- Output (Vout) | (GND) ``` * **C1 (Input Capacitor):** Usually a 1μF ceramic capacitor to handle transient line changes. * **C2 (Output Capacitor):** A 1μF to 10μF capacitor is required for loop stability. --- ## 5. Common Applications * Battery-powered equipment (Mobile phones, cameras). * Voltage reference for Microcontrollers (MCUs). * Portable audio and video players. * Wireless communication modules.