The **LR9280BL-28-AF5-R** is a specific low-dropout (LDO) linear regulator. These components are essential in power management for maintaining a steady output voltage despite fluctuations in input voltage or load conditions. --- ### 1. General Specifications The part numbering usually follows a specific nomenclature (often associated with manufacturers like UTC - Unisonic Technologies). Below is a breakdown of its primary technical characteristics: | Parameter | Specification | |:---|:---| | **Part Type** | Low-Dropout (LDO) Linear Regulator | | **Output Voltage** | 2.8V (Fixed) | | **Package Type** | SOT-25 / SOT-23-5 | | **Output Current** | Typically 300mA to 500mA (load dependent) | | **Quiescent Current** | Low power consumption (Ideal for battery devices) | | **Status** | Active / RoHS Compliant | --- ### 2. Part Number Deciphering The suffix and prefix provide specific details about the chip's configuration: * **LR9280**: The series family (High-speed LDO with high PSRR). * **BL**: Indicates specific internal circuitry or accuracy grading. * **28**: Represents the fixed output voltage of **2.8V**. * **AF5**: Refers to the **SOT-25** (5-pin) package style. * **R**: Indicates **Tape & Reel** packaging for automated assembly. --- ### 3. Key Features & Applications This electronic part is designed for precision and stability in compact environments. #### Features: * **High PSRR:** High Power Supply Rejection Ratio, meaning it filters out "noise" from the input power source effectively. * **Low Dropout Voltage:** Can maintain a 2.8V output even when the input voltage is only slightly higher than 2.8V. * **Fast Response:** Quickly adjusts to changes in the load (Transient Response). * **Built-in Protection:** Usually includes thermal shutdown and current limiting to prevent the chip from burning out. #### Common Applications: * **Mobile Phones:** Powering RF stages or camera modules that require clean 2.8V power. * **IoT Sensors:** Maintaining steady voltage from batteries as they discharge. * **Portable Electronics:** Tablets, handheld gaming consoles, and Bluetooth devices. --- ### 4. Pin Configuration (Typical SOT-25) In a standard AF5 (SOT-25) package, the pins are generally assigned as follows: 1. **VIN**: Input Voltage. 2. **GND**: Ground. 3. **EN / CE**: Enable/Chip Enable (High = ON, Low = OFF). 4. **NC / BP**: No Connection or Bypass Capacitor (for noise reduction). 5. **VOUT**: Regulated 2.8V Output.