The **UB261L-AI-AG6-R** is a specific low-dropout (LDO) linear regulator manufactured by **UTC (Unisonic Technologies)**. It belongs to the UB261 series, which is designed for high-efficiency power management in space-constrained applications. --- ### 1. Key Technical Specifications Below are the primary electrical characteristics of the UB261L-AI-AG6-R: | Parameter | Value / Description | | :--- | :--- | | **Component Type** | CMOS Low Dropout Linear Regulator (LDO) | | **Output Voltage** | Adjustable (indicated by the 'A' suffix) | | **Output Current** | 600mA (Maximum) | | **Dropout Voltage** | Low (typically ~300mV at full load) | | **Package Type** | SOT-26 (indicated by the 'AG6' code) | | **Operating Temp** | -40°C to +85°C | | **Feature** | Low Quiescent Current, Thermal Shutdown, Current Limit | --- ### 2. Part Number Breakdown Understanding the nomenclature helps identify the exact features of the component: * **UB261**: Series name. * **L**: Lead-free and Halogen-free (Environmentally friendly). * **AI**: Adjustable output version. * **AG6**: Package code for **SOT-26**. * **R**: Packing type (Tape & Reel). --- ### 3. Core Functional Features * **High Accuracy:** Provides a precise output voltage with low tolerance. * **Stability:** Designed to be stable with low-ESR ceramic capacitors, reducing the overall PCB footprint. * **Protection Circuits:** * *Current Limiting:* Prevents damage during short-circuit conditions. * *Thermal Protection:* Automatically shuts down if the junction temperature exceeds safe limits. * **Enable Pin:** Often includes an active-high/low enable pin to put the device into a low-power standby mode. --- ### 4. Typical Application Circuit When using the adjustable version (AI), the output voltage ($V_{OUT}$) is set using a resistive divider: ```text VIN ----[ LDO ]---- VOUT | | [R1] | |--FB (Feedback Pin) [R2] | GND ``` **Formula for Vout:** $V_{OUT} = V_{REF} \times (1 + \frac{R1}{R2})$ *(Where $V_{REF}$ is typically 0.8V or 1.2V depending on the specific UTC datasheet revision).* --- ### 5. Common Use Cases * **Battery-Powered Devices:** Smartphones, tablets, and portable medical equipment. * **Post-Regulation:** Cleaning up noise from switching power supplies (DC-DC converters). * **Microcontrollers:** Providing stable 1.8V, 2.5V, or 3.3V rails for MCU cores and I/O.