MIC28514

The MIC28514 is a high-efficiency, synchronous buck converter designed by Microchip Technology for powering low-voltage digital loads in compact and power-sensitive applications. It features an integrated high-side and low-side MOSFET, enabling efficient voltage regulation with minimal external components. The device supports an input voltage range from 3.0 V to 5.5 V, making it suitable for systems powered by single-cell Li-ion batteries or standard 5 V supplies. It delivers up to 3 A of continuous output current, ensuring reliable performance under varying load conditions. This converter operates at a fixed switching frequency of 1.2 MHz, which allows for the use of small external inductors and capacitors, reducing overall board space requirements. Its architecture includes adaptive on-time control, which provides fast transient response and maintains high efficiency across a wide load range—from light to full load—making it ideal for always-on or dynamic power management scenarios. The MIC28514 also incorporates comprehensive protection features such as over-current protection (OCP), thermal shutdown, and undervoltage lockout (UVLO), enhancing system reliability and safety. The IC is available in a compact 6-pin TSOT-23 package, simplifying integration into space-constrained designs. It offers a programmable soft-start function to minimize inrush current during startup, preventing voltage droop and ensuring stable operation. Additionally, the device supports remote sensing through the SENSE pin, allowing precise regulation at the load point despite PCB trace resistance. This feature is particularly valuable in high-current, low-voltage applications where accuracy is critical. Common applications include portable electronics such as smartphones, tablets, wearables, and IoT devices, where size, efficiency, and thermal performance are key design considerations. It is also well-suited for industrial and automotive systems requiring robust power conversion in harsh environments. The MIC28514’s low quiescent current and high efficiency contribute to extended battery life in battery-powered systems, while its robust protection mechanisms ensure long-term operational stability even under adverse conditions.