The **LR1106-28-AF5-R** is a specific low-dropout (LDO) linear voltage regulator manufactured by UTC (Unisonic Technologies Co.). It is designed for applications requiring low power consumption and stable voltage output. --- ## 1. Part Number Breakdown Understanding the suffix helps identify the exact specifications of the component: | Component Segment | Meaning | | :--- | :--- | | **LR1106** | Series Name (Low Noise, Low Dropout Regulator) | | **28** | Output Voltage: **2.8V** (Fixed) | | **AF5** | Package Type: **SOT-25** | | **R** | Packing: **Tape & Reel** | --- ## 2. Technical Specifications The LR1106 series is known for its high accuracy and low quiescent current. | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | Up to 6.0V | | **Output Voltage** | 2.8V (Fixed) | | **Output Current** | 300mA (Typical) | | **Dropout Voltage** | ~150mV @ 100mA | | **Quiescent Current** | ~50µA | | **Accuracy** | ±2% | | **Operating Temperature** | -40°C to +85°C | --- ## 3. Pin Configuration (SOT-25) The device typically uses a 5-pin layout to provide an "Enable" function, which allows the chip to be turned off to save power. 1. **VIN**: Input Voltage Supply. 2. **GND**: Ground. 3. **EN/CE**: Chip Enable (High = On, Low = Off). 4. **NC/BP**: No connection or Bypass capacitor (for noise reduction). 5. **VOUT**: Regulated 2.8V Output. --- ## 4. Key Features & Applications ### Features * **Low Dropout:** Allows the device to regulate voltage even when the input is only slightly higher than the output. * **Built-in Protections:** Includes thermal shutdown and current limiting to prevent damage during faults. * **Low Noise:** Suitable for sensitive RF and analog circuits. ### Common Applications * Battery-powered devices (Smartphones, IoT sensors). * Camera modules. * Portable audio players. * Reference voltage sources for Microcontrollers (MCUs). --- ## 5. Typical Application Circuit To ensure stability, LDOs require external capacitors. ```mermaid graph LR Input -->|C1: 1uF| VIN[LR1106] VIN --> VOUT VOUT -->|C2: 1uF| Output EN -->|Logic High| VIN ```