LM317LIDG4

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LM317LIDG4 application field and working principle

The LM317LIDG4 is a high performance and cost-effective three-terminal adjustable positive voltage regulator commonly used in power systems. It provides a regulated output voltage of 1.2 V to 37 V with current limiting, thermal shut-down and safe area compensation. Typical applications for LM317LIDG4 voltage regulators include on-board voltage regulation and single cell Li-ion battery regulation.

LM317LIDG4 is a high-performance step-down, three-terminal adjustable positive linear voltage regulator with adjustable current limiting, thermal shut-down, and safe area compensation. It operates as a current regulator or as a voltage regulator, depending on the external components. When installed, the output voltage is determined by a resistor divider network, or it can be adjusted to 1.2 V to 37 V with an external control current.

Working Principle of LM317LIDG4

The LM317LIDG4 voltage regulator consists of an internal error amplifier, series pass transistor, current limit and thermal shutdown system. The LM317LIDG4 senses the output voltage with respect to its adjustable pin (VADJ) and adjusts the gate voltage of the pass transistor accordingly to maintain the output voltage at a preset value.

The internal error amplifier of the LM317LIDG4 senses the output voltage with respect to an internal reference voltage. The error amplifier then compares these two voltages and adjusts the output of the differential amplifier. The output of the differential amplifier is then applied to the gate of the pass transistor, thus controlling the output voltage. The error amplifier also provides current limiting and thermal shutdown protection.

Applications of LM317LIDG4

The LM317LIDG4 is suitable for a variety of applications such as on-board voltage regulators, Li-ion battery charge controllers, and other low power DC/DC converter circuits. The LM317LIDG4 is also suitable for voltage regulation in laptop and tablet PCs, mobile handsets and smart appliances. Its high efficiency and low quiescent current make it an ideal choice for battery powered applications.

The LM317LIDG4 is a good choice for applications where low output voltage drop is desired and the maximum output current is restricted to 700 mA or lower. Its low dropout voltage make it highly suitable for Li-ion battery regulation. Its low quiescent current and low dropout voltage also make it suitable for applications that require energy efficient operation.

Advantages of LM317LIDG4

The LM317LIDG4 has a wide-range adjustable output voltage and is capable of providing a stable output voltage in the range of 1.2 to 37 V. It also has a low quiescent current that helps conserve power. In addition, its output current capability of up to 700 mA makes it suitable for applications such as single cell Li-ion battery regulation. The device also has thermal shutdown protection that helps protect it from damage in the presence of high temperatures. The wide operating temperature range of -40°C to +85°C makes it suitable for a wide range of operating environments.

The LM317LIDG4 is a low-cost, step-down, three-terminal adjustable positive linear voltage regulator with adjustable current limiting, thermal shut-down, and safe area compensation. It is suitable for applications such as on-board voltage regulation and single cell Li-ion battery regulation. Its wide-range adjustable output voltage, low quiescent current and thermal protection makes it an ideal choice for portable or battery-powered applications.

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