The **LR1106-22-AF5-R** is a specific low-dropout (LDO) linear regulator manufactured by **UTC (Unisonic Technologies)**. It is designed to provide a stable 2.2V output from a higher input voltage with very low noise and high efficiency. --- ### 1. Key Technical Specifications The following table outlines the primary electrical characteristics of the LR1106-22-AF5-R: | Parameter | Specification | | :--- | :--- | | **Output Voltage (Fixed)** | 2.2V | | **Input Voltage Range** | Up to 6.0V | | **Output Current** | 150mA to 300mA (load dependent) | | **Dropout Voltage** | Low (typically < 300mV at full load) | | **Package Type** | SOT-25 / SOT-23-5 | | **Quiescent Current** | ~50µA (Low power consumption) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Part Number Breakdown Understanding the suffix codes helps in identifying the exact variant: * **LR1106**: The series name (Low Noise, LDO Regulator). * **22**: Indicates the fixed output voltage of **2.2V**. * **AF5**: Refers to the **SOT-25** (also known as SOT-23-5) package type. * **R**: Indicates **Tape and Reel** packaging for automated assembly. --- ### 3. Pin Configuration (SOT-25) A typical pinout for this regulator is structured as follows: | Pin Number | Symbol | Function | | :--- | :--- | :--- | | 1 | **VIN** | Input Voltage Supply | | 2 | **GND** | Ground | | 3 | **CE / EN** | Chip Enable (Active High) | | 4 | **NC / BP** | No connection or Bypass Capacitor (for noise reduction) | | 5 | **VOUT** | Regulated 2.2V Output | --- ### 4. Typical Applications Due to its low noise and compact size, this part is commonly used in: * **Battery-Powered Devices**: Smartphones, tablets, and portable medical equipment. * **RF Modules**: Powering sensitive Bluetooth or Wi-Fi chips that require clean 2.2V rails. * **Sensors**: Supplying stable voltage to analog sensors to ensure measurement accuracy. ### 5. Essential Implementation Notes * **Capacitor Selection**: Usually requires a small ceramic capacitor (typically 1µF) on both the input and output pins for stability. * **Thermal Management**: Since it is a linear regulator, the power dissipated is calculated as $P = (V_{IN} - V_{OUT}) \times I_{OUT}$. Ensure the SOT-25 package can handle the heat at your specific input voltage. ---