The **LR9102G-25-AF5-R** is a low-dropout (LDO) linear regulator manufactured by UTC (Unisonic Technologies). It is designed to provide a stable, fixed output voltage with low noise and low power consumption. --- ### ## Technical Specifications Below are the primary electrical characteristics of the LR9102G-25-AF5-R: | Parameter | Specification | | :--- | :--- | | **Output Voltage (Vout)** | 2.5V (Fixed) | | **Input Voltage Range** | Up to 6V | | **Output Current** | 300mA | | **Dropout Voltage** | ~200mV @ 100mA | | **Quiescent Current** | ~50µA | | **Package Type** | SOT-25 / SOT-23-5 | | **Operating Temperature** | -40°C to +85°C | --- ### ### Key Features * **Low Dropout Voltage:** Allows the device to operate efficiently even when the input voltage is only slightly higher than the output voltage. * **Shutdown Mode:** Includes an "Enable" (EN) pin to turn off the device, reducing current consumption to nearly zero. * **Built-in Protections:** * *Current Limiting:* Prevents damage during over-current conditions. * *Thermal Shutdown:* Automatically turns off the chip if it exceeds safe operating temperatures. * **Stability:** Optimized for use with low-ESR ceramic capacitors. --- ### ### Pin Configuration (SOT-25) | Pin Number | Symbol | Description | | :---: | :---: | :--- | | 1 | **VIN** | Input Voltage Supply | | 2 | **GND** | Ground | | 3 | **EN** | Enable Pin (High = On, Low = Off) | | 4 | **NC/BP** | No Connection or Bypass Capacitor | | 5 | **VOUT** | Regulated 2.5V Output | --- ### ### Part Number Breakdown Understanding the suffix codes for this specific component: * **LR9102:** Series name (LDO Regulator). * **G:** Halogen-free and Lead-free (Green). * **25:** Fixed output voltage of **2.5V**. * **AF5:** Package code for **SOT-25**. * **R:** Packing type (Tape and Reel). --- ### ### Typical Application Circuit To ensure stability, a typical circuit requires minimal external components: ```text Input (Vin) ----[ C1: 1uF ]----( PIN 1: VIN ) ( PIN 5: VOUT )----[ C2: 1uF ]---- Output (2.5V) ( PIN 2: GND )---- Ground ( PIN 3: EN )---- Logic High/Input ```