PMIC - Voltage Regulators - Linear

The UA7805CKTER is a linear voltage regulator IC primarily manufactured by STMicroelectronics that provides a regulated voltage output of 5.0 V. It includes two distinct outputs and two voltage references: a main output voltage, which is adjustable they can be externally adjusted to output a range between 1.2 V and 20 V, and an auxiliary voltage of 5 V, which is fixed and not adjustable. This IC has low dropout and low quiescent current, meaning that it utilizes a minimal amount of current during normal operation. It is a cost-effective, small form factor voltage regulator for applications such as power supply, laptop computer battery charger, and so on.

Application Field

The UA7805CKTER is a large-scale integrated monolithic linear voltage regulator integrated circuit primarily used in applications where cost-effective, low-power, and high-stability voltage regulation is required. Applications include: automotive battery chargers, robotic medical equipment, point of sale systems, fire and security systems, as well as various consumer electronic products such as PC power supplies, mobile phones and GPS systems.

Working Principle

The UA7805CKTER is a linear voltage regulator that works by using an external resistor to adjust the output voltage. A feedback loop continuously monitors the output voltage and adjusts the voltage across the resistor to maintain the desired output voltage. The UA7805CKTER has a limited supply current, meaning that its output current capability is limited to its supply current. The use of current limiting feature significantly reduces the cost of components such as switching transistors and allows the circuit to effectively limit its output current.The UA7805CKTER also includes several other features to make it easy to use in applications such as thermal shutdown, short circuit protection, over-temperature protection, and foldback protection. Thermal shutdown shut offs the regulator when it has reached a specified temperature to prevent damage to the IC. Short circuit protection allows the IC to maintain a constant voltage under short circuit circumstances. The foldback protection feature is used to reduce the output current of the IC when the output current is high.

Conclusion

The UA7805CKTER is a cost-effective and efficient linear voltage regulator IC designed for applications requiring low-power and high-stability voltage regulation. It has several features such as low dropout, low quiescent current, current limiting, and protection features, making it an ideal choice for applications such as automotive battery chargers, robotic medical equipment, point of sale systems, fire and security systems, and various consumer electronic products.