L4979D013TR

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The L4979D013TR, manufactured by STMicroeclectronics, is a low-dropout linear voltage regulator with an input voltage operating range from 5V to 40V. It offers a low quiescent current and very low-dropout voltage of 130mV, making it suitable for applications with a limited number of battery cells or higher input voltage sources. Operating at an a maximum ambient temperature of +125°C, the device is well-suited for applications in the industrial, automotive, and consumer sectors.

The L4979D013TR regulates the output voltage precisely over a wide temperature range and provides excellent transient responses. The device operates in continuous mode with an output-current capability of up to 800mA. It typically has a fast transient response of 5mV forload steps up to 100 mA and 25mV for steps up to 400mA. For steps up to 800mA, the transient is typically 40mV.

The device is designed to provide the necessary protection from overload, short circuit, reverse-battery, and thermal overload. The L4979D013TR also provides current limitation, with an overload recovery time of about 4ms. To reduce the power consumption, the device includes a shutdown feature which allows it to be disabled when not in use.

The L4979D013TR is suitable for applications where a wide input voltage range and excellent load regulation are needed. Such applications include automotive electronics, battery-operated therapeutic medical devices, consumer electronics, and industrial controls. Additionally, the device is particularly well-suited for applications requiring high power efficiency and low power consumption.

The L4979D013TR operates according to the following principles: Electrons enter the device on a negative power-supply voltage and flow in the same direction. Inside the device, the electrons flow through the transistor, causing a decrease in the resistance, which allows current to flow from the positive power-supply voltage. This current enters the base of the transistor, where it is regulated and then amplified. Finally, the regulated voltage is output from the emitter of the transistor.

In summary, the L4979D013TR is a low-dropout linear regulator with a wide input voltage range (5V to 40V) and excellent load regulation. It is designed to provide the necessary protection from overloads, short circuits, reverse-battery, and thermal overloads. With its low quiescent current and fast transient response, the device is ideal for applications which require high power efficiency and low power consumption.

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