The **US202AHL-AF5-R** is a specific integrated circuit produced by **Unisonic Technologies (UTC)**. It is primarily categorized as a **Low Dropout (LDO) Linear Voltage Regulator** designed for high-efficiency power management in space-constrained applications. ### 1. Key Technical Specifications The following table outlines the core electrical characteristics of the US202AHL-AF5-R: | Parameter | Specification | | :--- | :--- | | **Output Voltage** | Adjustable (Low Voltage capability) | | **Input Voltage Range** | Up to 6V (Typical) | | **Output Current** | 200mA to 300mA (Standard for US202 series) | | **Package Type** | SOT-25 / SOT-23-5 | | **Dropout Voltage** | Ultra-Low Dropout (typically < 300mV at full load) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Functional Components and Pinout The "AF5" in the part number indicates a **SOT-25** (5-pin) package. The typical pin configuration is as follows: 1. **VIN**: Input Voltage supply. 2. **GND**: Ground reference. 3. **EN/CE**: Chip Enable (High = On, Low = Shutdown). 4. **ADJ/FB**: Feedback pin for setting the output voltage via external resistors. 5. **VOUT**: Regulated Output Voltage. --- ### 3. Features and Benefits * **Low Quiescent Current**: Minimal power consumption during standby, extending battery life in portable devices. * **High PSRR**: Power Supply Rejection Ratio, which helps filter out noise from the input power source. * **Built-in Protection**: * *Thermal Shutdown*: Prevents damage from overheating. * *Current Limiting*: Protects the IC during short-circuit conditions. * **Stability**: Optimized for use with low-ESR ceramic capacitors. --- ### 4. Part Number Breakdown The nomenclature can be interpreted as follows: * **US202**: Series name (LDO Regulator). * **A**: Version/Accuracy code. * **HL**: Specific internal feature set or voltage reference type. * **AF5**: Package code (SOT-25 / SOT-23-5). * **R**: Tape and Reel packaging (for automated PCB assembly). --- ### 5. Common Applications * Battery-powered handheld equipment. * Reference voltage sources for Microcontrollers (MCUs). * Wireless modules (Wi-Fi/Bluetooth) requiring clean power. * Digital cameras and mobile phones. ---