The NCP1117LPST33T3G from onsemi is a low power version of the NCP1117 family, designed to meet the needs of high volume consumer applications. It is a low-dropout (LDO) positive voltage regulator capable of delivering an output current in excess of 1 A. This series includes both adjustable and fixed voltage versions, offering flexibility for various design requirements. The device features a low dropout voltage of 1.3 V at full load, making it suitable for applications with tight voltage margins.
Key protection features include output current limiting and thermal shutdown, ensuring reliable operation under adverse conditions. The NCP1117LPST33T3G operates with an input voltage up to 18 V, accommodating a wide range of power supplies. It is available in the popular SOT-223 and DPAK packages, providing options for different mounting preferences.
Voltage Regulator
Low-dropout (LDO) voltage regulators are critical components in electronic circuits, providing stable output voltage levels despite variations in input voltage and load conditions. They are particularly useful in battery-powered devices where maximizing battery life is essential, as well as in applications requiring a stable voltage supply from a higher voltage source.
When selecting an LDO regulator, key considerations include the dropout voltage, output current capability, quiescent current, and the availability of fixed versus adjustable output voltage options. The dropout voltage is particularly important as it determines the minimum difference between input and output voltage for the regulator to maintain regulation. A lower dropout voltage allows for more efficient use of the power source.
Another important factor is the output current capability, which should match or exceed the maximum current draw of the load. Quiescent current, the current consumed by the regulator when no load is connected, affects the overall power efficiency and is particularly crucial in battery-operated devices.
The NCP1117LPST33T3G offers a balance between low dropout voltage and high output current capability, making it suitable for a wide range of applications. Its protection features ensure reliability and long-term performance, making it a solid choice for designers looking for a versatile LDO solution.