The **UT213G-R28-R** is an integrated circuit (IC) manufactured by **Unisonic Technologies Co., Ltd (UTC)**. It belongs to a family of low-dropout (LDO) linear regulators designed for high stability and low noise performance in portable electronics. ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Component Type** | CMOS Low Dropout Regulator (LDO) | | **Output Voltage** | 2.8V (Fixed) | | **Package Type** | SOT-23 / SOT-25 (Typically R28 denotes 2.8V) | | **Maximum Output Current** | 300mA - 500mA (Depending on thermal limits) | | **Input Voltage Range** | Up to 6.0V | | **Quiescent Current** | Low (Typically < 50µA) | | **Protection Features** | Over-current and Over-temperature protection | --- ### 2. Part Number Breakdown The nomenclature for UTC parts usually follows a specific logic: * **UT213G**: The series prefix (High-speed, low-noise LDO). * **-R28**: Indicates the fixed output voltage (2.8 Volts). * **-R**: Refers to the Tape & Reel packaging format. --- ### 3. Core Functional Features * **Low Dropout Voltage:** Requires a very small difference between input and output voltage to maintain regulation, which maximizes battery life. * **Fast Response:** Designed to handle rapid changes in load current without significant voltage drops, making it ideal for RF (Radio Frequency) modules. * **Low Noise:** Optimized for sensitive analog circuits such as camera modules or audio decoders. * **Standby Mode:** Often includes an Enable (EN) pin to shut down the IC when not in use, reducing power consumption to near zero. --- ### 4. Typical Application Circuit The UT213G series is designed to be used with ceramic capacitors for stability. ```mermaid graph LR Vin[Input Voltage] --> Cin[1uF Capacitor] Cin --> IC[UT213G-R28] IC --> Cout[1uF Capacitor] Cout --> Vout[2.8V Regulated Output] IC -.-> GND[Ground] ``` --- ### 5. Common Use Cases 1. **Mobile Phones:** Powering CMOS image sensors. 2. **Wearables:** Battery-powered devices requiring stable 2.8V rails for microcontrollers. 3. **Wireless Modules:** Bluetooth or Wi-Fi chips that are sensitive to power supply ripples.