L4949NG

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Linear voltage regulators are widely used in many applications, including cell phones, servers, automotive, and medical. They provide a stable voltage for the device, maintaining voltage accuracy over a wide temperature range. The Linear L4949NG application field and working principle are among the most popular.

The Linear L4949NG is a low-dropout voltage regulator that provides a stable voltage to the circuit without exceeding the maximum number of watts allowed by the Regulator. It provides fast transient response and precision line regulation, and is suitable for high currents. The L4949NG is designed with a low quiescent current which helps reduce total system power consumption.

Working principle of the Linear L4949NG is based on the same principle that is used in all linear regulators, however the L4949NG uses a voltage reference instead of a feedback network. The voltage reference is a NPN bipolar transistor connected as a source follower, which works in conjunction with the output transistor to adjust the output voltage. The output transistor is controlled by the output voltage set point, which is set by the voltage reference.

The Linear L4949NG features fast transient response, which helps to maintain output voltage accuracy over a wide temperature range. It also prevents short circuit currents with current limit protection. There are two methods of protection: soft start and hiccup. The soft start feature limits inrush currents, which is important for applications that require soft start. The hiccup mode is used when the output current is too large and will shut off the output until the current drops below an acceptable level.

The Linear L4949NG is designed for ease of use and offers a wide input voltage range, meaning that it can be used in any application that requires a stable voltage. It is available in two packages, a TO-220 package and a SOT-223 Package, and is capable of handling up to 270 mA of continuous load current. With an operating temperature range of -40°C to +125°C and a storage temperature range of -65°C to +150°C, it is suitable for a wide range of temperature environments.

Overall, the Linear L4949NG provides an ideal solution for applications requiring low-dropout voltage regulation. It provides fast transient response, precision line regulation, and a low quiescent current, making it a great choice for many applications. It is easy to use and is capable of handling up to 270 mA of continuous load current. It has a wide operating temperature range and is available in two packages, making it ideal for any application.

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