The **LR1102BL-25-AF5-R** is a low-dropout (LDO) linear regulator manufactured by UTC (Unisonic Technologies Co., Ltd). It is designed to provide a stable 2.5V output from a higher input voltage with very low noise and high ripple rejection. --- ### ## 1. Technical Specifications The table below highlights the core electrical characteristics of the device: | Parameter | Specification | | :--- | :--- | | **Output Voltage** | 2.5V (Fixed) | | **Output Current** | 150mA to 300mA (typical range) | | **Input Voltage (Max)** | 6.0V - 7.0V | | **Dropout Voltage** | Low (typically ~150-300mV at full load) | | **Quiescent Current** | ~50µA (Low power consumption) | | **Package Type** | SOT-25 / SOT-23-5 | | **Operating Temperature** | -40°C to +85°C | --- ### ## 2. Part Number Breakdown Understanding the suffix codes helps in identifying the specific variant: * **LR1102**: Basic model series (Low Noise LDO). * **B**: Version/Revision (often indicates specific accuracy or enable pin logic). * **L**: Lead-free/Halogen-free plating. * **25**: Indicates the **2.5V** fixed output voltage. * **AF5**: Refers to the **SOT-25** (also known as SOT-23-5) package. * **R**: Tape and Reel packaging. --- ### ## 3. Key Features and Functions The LR1102BL series is built with several integrated protections and performance features: 1. **Low Noise Output:** Ideal for RF circuits and sensitive analog components (like ADCs). 2. **Enable (EN) Pin:** Allows the chip to be put into a shutdown mode, reducing current consumption to nearly zero (typically <1µA). 3. **Built-in Protections:** * **Over-Current Protection (OCP):** Limits the output current to prevent damage during a short circuit. * **Thermal Shutdown:** Shuts the device off if the internal junction temperature exceeds safe limits. 4. **Stability:** Usually requires only small ceramic capacitors (e.g., 1µF) for stable operation, saving PCB space. --- ### ## 4. Typical Application Circuit In a standard design, the component is used as follows: ```c Input (Vin) ----[ C1 (1uF) ]----| (IN) (OUT) |----[ C2 (1uF) ]---- Output (2.5V) | LR1102 | Logic High/Low -----------------| (EN) (GND) |-------------------- Ground ``` ### ## 5. Common Applications * Battery-powered portable equipment (Smartphones, MP3 players). * Reference voltage sources for microcontrollers (MCUs). * Wireless communication modules (Bluetooth, Wi-Fi). * Post-regulation for switching power supplies. ---