The LD1117 series from STMicroelectronics encompasses a range of low drop voltage regulators capable of providing up to 800 mA of output current. These regulators are available in both adjustable and fixed output versions, making them versatile for a wide range of applications. The fixed output versions offer voltages of 1.2 V, 1.8 V, 2.5 V, 2.85 V, 3.3 V, and 5.0 V.
Key features of the LD1117 series include a low dropout voltage of typically 1 V, making them efficient for applications where voltage supply is a critical factor. The regulators are designed with an NPN pass transistor, which ensures high efficiency as the quiescent current flows mostly into the load. Stability is easily achieved with a common 10 µF capacitor. On-chip trimming provides the regulators with a very tight output voltage tolerance, within ± 1% at 25°C, ensuring reliable performance.
Voltage Regulators
Voltage regulators are fundamental components in electronic circuits, providing stable output voltage despite variations in input voltage or load conditions. They are essential in preventing damage to electronic components that require a constant voltage supply. The LD1117 series, being low drop voltage regulators, are particularly useful in applications where the supply voltage is only slightly higher than the required output voltage, thus minimizing power loss and improving efficiency.
Choosing the right voltage regulator involves considering factors such as output current capacity, dropout voltage, fixed or adjustable output voltage, and package type. The LD1117 series offers a variety of options to meet these requirements, including different output voltages and package types. When selecting a voltage regulator, it's important to ensure the regulator can handle the maximum expected input voltage and output current without exceeding its thermal limits. Additionally, the dropout voltage is a critical parameter, especially in battery-powered applications where maximizing battery life is a priority.
The LD1117 regulators are equipped with internal current and thermal limit protections, enhancing their reliability in various applications. Their availability in both fixed and adjustable versions adds to their versatility, allowing for precise voltage regulation as needed. Furthermore, the series' low dropout voltage feature makes it an excellent choice for applications requiring efficient power management.
In summary, the LD1117 series provides a reliable and efficient solution for voltage regulation needs in a wide range of applications. Whether for active termination in SCSI-2 devices, general-purpose low-voltage applications, or portable devices, these regulators offer the performance and flexibility required to meet the demands of modern electronic circuits.