The **LR1148G-AD-AF5-R** is a specific low-dropout (LDO) linear regulator manufactured by **UTC (Unisonic Technologies)**. It is designed to provide a stable, adjustable output voltage from a higher input voltage with very low power loss. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Type** | Adjustable Low Dropout (LDO) Regulator | | **Input Voltage Range** | Up to 6.0V | | **Output Voltage Range** | Adjustable (ADJ) via external resistors | | **Maximum Output Current** | 1A (Typical) | | **Dropout Voltage** | ~0.6V @ 1A (varies by load) | | **Package Type** | SOT-25 / SOT-23-5 | | **Operating Temp** | -40°C to +85°C | --- ### 2. Part Number Breakdown Understanding the suffix codes helps identify the specific variant: - **LR1148**: Series name (1A LDO Regulator). - **G**: Halogen-free and Lead-free (Green). - **AD**: Adjustable output version (requires external resistor divider). - **AF5**: Package code for **SOT-25** (also known as SOT-23-5). - **R**: Tape and Reel packaging. --- ### 3. Pin Configuration (SOT-25) Standard pinout for the adjustable version: 1. **VIN**: Input Voltage. 2. **GND**: Ground. 3. **EN / CE**: Enable / Chip Enable (High = ON, Low = OFF). 4. **ADJ / FB**: Feedback pin used to set the output voltage. 5. **VOUT**: Regulated Output Voltage. --- ### 4. Application Circuit To use the **ADJ** version, you must connect two resistors ($R_1$ and $R_2$) to the Feedback (ADJ) pin. The formula for the output voltage is generally: `VOUT = VREF × (1 + R1 / R2)` *(Where VREF is typically 0.8V for this series).* --- ### 5. Common Applications * Battery-powered equipment (due to low quiescent current). * Post-regulation for switching power supplies. * Powering Microcontrollers (MCUs) and FPGAs. * Wireless communication modules.