LK115D30

PMIC - Voltage Regulators - Linear

Linear voltage regulators are widely used in the development of power management integrated circuits (PMICs). Their design assists power management functions such as voltage conversion, voltage regulation, and current limitation. The LK115D30 is a three-terminal linear voltage regulator manufactured by STMicroelectronics. It is a low-dropout linear positive regulator, capable of supplying up to 1.5A continuous current.

Application Field

The LK115D30 is a monolithic linear regulator with a wide input voltage range of 4.5V to 20V and an adjustable output voltage ranging from 1.5V to 16V. It is designed specifically for low-voltage, high-current operation in automotive and industrial applications. Its high power dissipation rate also makes it ideal for applications where large input-output voltage differences are involved. It is especially effective for stabilizing voltage during cold-cranking and engine stop conditions.

The LK115D30 regulator is available in several different packages, including SOT-223, TO-220 and TO-263. It is also compatible with lead-free and RoHS-certified soldering techniques, making it the perfect choice for eco-friendly electronics. Additionally, the LK115D30 exhibits short-circuit protection, current-limiting and thermal-shutdown protection. It also provides excellent line and load regulation, making it the ideal choice for dynamic, demanding applications.

Working Principle

The core function of all linear voltage regulators is to maintain a stable output voltage, regardless of varying input voltage or load conditions. This is achieved by utilizing an integrated voltage reference, typically provided by a zener diode, to compare the desired voltage against the actual voltage leaving the output terminal. Whenever the actual output voltage exceeds the reference voltage, the regulator will reduce the amount of current delivered to the load, thereby reducing the output voltage and maintaining the desired voltage level. The LK115D30 regulator includes a three-terminal design, where the input and output terminals are connected to each other and the middle terminal is connected to the reference voltage.

The regulator contains an internal voltage reference, typically provided by a zener diode. The desired output voltage is determined by the proportion of the reference voltage supplied to the middle terminal of the regulator. Since the reference voltage is stable and fixed, the output voltage remains constant, even in the presence of large variations in input voltage and/or load conditions. Furthermore, the LK115D30 regulator offers improved performance over other linear voltage regulators due to its patented internal circuitry and design, which provides excellent line and load regulation, short-circuit protection, current-limiting and thermal-shutdown.

The LK115D30 linear regulator is an ideal choice for low-voltage, high-current applications in automotive and industrial systems. Its three-terminal design, wide input voltage range, adjustable output voltage range, and high power dissipation rate make it an excellent choice for stabilizing voltage in all kinds of dynamic, demanding conditions.