The **LR9280CL-28-AE2-R** is a specific low-dropout (LDO) linear regulator manufactured by UTC (Unisonic Technologies Co., Ltd.). It is designed to provide a stable, fixed output voltage from a higher input voltage with very low noise and minimal power loss. ### 1. Part Number Breakdown Understanding the suffix codes helps identify the specific characteristics of this component: | Component Part | Meaning | Description | | :--- | :--- | :--- | | **LR9280** | Base Series | Low Dropout (LDO) Linear Regulator | | **CL** | Feature Code | High PSRR, Low Noise, and Low Quiescent Current | | **28** | Voltage Code | Fixed Output Voltage: **2.8V** | | **AE2** | Package Code | **SOT-23-3** (Small Outline Transistor) | | **R** | Packing | **Tape & Reel** (Standard for automated assembly) | --- ### 2. Key Technical Specifications The LR9280 series is optimized for battery-powered applications where efficiency and space are critical. * **Output Voltage:** Fixed 2.8V. * **Maximum Output Current:** Typically 300mA to 600mA (model dependent). * **Dropout Voltage:** Extremely low (approx. 200mV at full load), allowing the device to function even when the battery is nearly discharged. * **PSRR (Power Supply Rejection Ratio):** High (approx. 70dB at 1kHz), which filters out input noise effectively. * **Quiescent Current:** Very low (around 50-70µA), preserving battery life in idle states. * **Input Voltage Range:** Typically up to 6V. --- ### 3. Pin Configuration (SOT-23-3) The device uses a standard 3-pin footprint. | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | **GND** | Ground connection. | | 2 | **VOUT** | Regulated output voltage (2.8V). | | 3 | **VIN** | Unregulated input voltage. | --- ### 4. Typical Application Circuit To ensure stability, LDOs require external capacitors. For the LR9280CL, Ceramic capacitors with low ESR are recommended. ```c Input (VIN) ----+-------[ LR9280 ]-------+---- Output (2.8V) | (VOUT) | [C1] (GND) [C2] | | | Ground ----------+---------+--------------+ ``` * **C1 (Input Capacitor):** 1µF Ceramic (prevents input oscillations). * **C2 (Output Capacitor):** 1µF to 2.2µF Ceramic (essential for loop stability). --- ### 5. Common Applications * **Mobile Devices:** Powering 2.8V logic in smartphones or tablets. * **Camera Modules:** Providing clean power to image sensors (due to high PSRR). * **RF Modules:** Bluetooth or Wi-Fi chips requiring noise-free supply. * **Battery-Powered Tools:** Extending run-time via low quiescent current.