The **LR1102BL-33-AF5-R** is a low-dropout (LDO) linear regulator produced by Unisonic Technologies (UTC). It is designed to provide a stable, fixed output voltage while maintaining low noise and low power consumption. --- ### ## Technical Specifications Below are the primary electrical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Output Voltage (Vout)** | 3.3V (Fixed) | | **Input Voltage Range** | Up to 7V | | **Maximum Output Current** | 300mA | | **Dropout Voltage** | ~300mV @ 300mA | | **Quiescent Current (Iq)** | 50µA (Typical) | | **Package Type** | SOT-25 / SOT-23-5 | | **Operating Temperature** | -40°C to +85°C | --- ### ### Key Features and Benefits * **Low Dropout Voltage:** Allows the regulator to function efficiently even when the input voltage is very close to the output voltage. * **High Ripple Rejection:** Effective at filtering out noise from the power source, making it suitable for RF and sensitive analog circuits. * **Built-in Protection:** * **Current Limiting:** Protects the IC against short circuits or excessive load. * **Thermal Shutdown:** Prevents damage caused by overheating. * **ON/OFF Control:** Includes an enable pin (CE/EN) to put the device into a low-power standby mode. --- ### ### Part Number Breakdown The suffix codes in the part number provide specific manufacturing details: | Suffix | Meaning | | :--- | :--- | | **LR1102** | Base series number (LDO Regulator) | | **BL** | Accuracy and specific feature variant | | **33** | Output voltage indicator (3.3 Volts) | | **AF5** | Package code (SOT-25 / SOT-23-5) | | **R** | Packing type (Tape & Reel) | --- ### ### Typical Application Circuit To ensure stability, LDOs require external capacitors. The standard configuration for the LR1102 is as follows: ```text Input (Vin) ----[ Cin 1uF ]----( Pin 1: VIN ) ( Pin 2: GND )---- Ground Enable Signal -----------------( Pin 3: CE ) ( Pin 4: NC ) Output (Vout)---[ Cout 1uF ]---( Pin 5: VOUT) ``` 1. **Cin:** A 1µF ceramic capacitor is recommended to minimize input noise. 2. **Cout:** A 1µF (or higher) ceramic capacitor is required for loop stability. 3. **CE Pin:** Driven high to enable the regulator; driven low to shut it down.