The **LD2985G-D0-AF5-R** is a low-dropout (LDO) linear voltage regulator. It is designed for high-performance applications where low noise, low quiescent current, and high precision are required. --- ### 1. Key Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Output Voltage** | Fixed Output (Consult datasheet for specific "D0" code, typically 3.0V) | | **Max Output Current** | 150 mA | | **Input Voltage Range** | Up to 16V | | **Dropout Voltage** | Low (approx. 160mV at 150mA) | | **Quiescent Current** | 80 µA (Typical) | | **Package Type** | SOT-23-5 (indicated by "AF5") | | **Temperature Range** | -40°C to +125°C | --- ### 2. Part Number Breakdown Understanding the suffix nomenclature helps in identifying specific features: * **LD2985**: Basic series name (Ultra-low noise LDO). * **G**: Halogen-free and RoHS compliant. * **D0**: Voltage code (e.g., 3.0V, 3.3V, or 5.0V depending on the manufacturer's specific mapping). * **AF5**: Package type, specifically **SOT-23-5**. * **R**: Packing type (Tape & Reel). --- ### 3. Core Features * **Low Noise:** Includes a bypass pin (BP) to allow for the connection of an external capacitor to further reduce output noise, making it ideal for RF and sensitive analog circuits. * **Inhibit (Shutdown) Function:** Pin 3 is usually a control pin that allows the regulator to be turned off electronically, reducing current consumption to nearly zero. * **Stability:** Requires only a small 1µF ceramic capacitor for stability, saving board space. * **Protection:** Built-in thermal shutdown and current limit protection. --- ### 4. Typical Pin Configuration (SOT-23-5) | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **VIN** | Input Voltage | | 2 | **GND** | Ground | | 3 | **INH/OFF** | Inhibit/Shutdown (Active High) | | 4 | **BYP** | Bypass Capacitor (Noise reduction) | | 5 | **VOUT** | Regulated Output Voltage | --- ### 5. Common Applications * **Mobile Phones:** Due to low noise and small footprint. * **Battery-Powered Systems:** Low quiescent current extends battery life. * **Precision Instruments:** High accuracy and stable output. * **Wireless Modules:** Low interference for RF components. ---