L4949D

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The L4949D is a part of the Linear Voltage Regulators range from the PMIC family of components. It is designed to provide a regulated output voltage from a higher unregulated voltage, or to maintain a specific output voltage despite of changing input voltage. This component is commonly used in various applications such as automotive, avionics, consumer electronics and power supplies.

The L4949D is a step-down Voltage Regulator module that has a minimum input operating voltage of 7V and a maximum input voltage of 40V, with an output load capability of 3A current. The component has a wide range of adjustable output voltage between 1.5V and 37V. The operational temperature of the component can range between -40°C and +125°C. The component also has a shutdown function that reduces the quiescent current consumption and prevents the output voltage from exceeding 1.4V.

In terms of physical characteristics, the module is available in the conventional Dip package with a footprint of 8mm x 8mm, and weighs around 4.3 grams. It also features a minimum-on-time of 50ns and a short-circuit current limit of 0.75A.

The principle of operation of the L4949D component is based on the output voltage feedback system. The module takes a reference voltage from the output, compares this with the given reference level, makes necessary adjustments and maintains the output voltage at the given reference level no matter what the input voltage is. The component also contains a slew rate control circuit that prevents output voltage overshoots during load transients.

The component also has an Error Flag output that is activated when the output voltage falls outside the acceptable limits or when the system is in short circuit or over-temperature condition. This output can be used to provide a feedback or to perform shutdown control for the entire system.

In terms of stability, the device has a wide operating range, including high frequency ripple current capability, low output voltage ripple and an excellent no-load regulation and line regulation, making it suitable for high-reliability and low-noise applications.

All in all, the L4949D is an ideal choice as a voltage regulator module in various applications. Its wide input and output voltage range, low quiescent current, wide temperature range and good stability make it an ideal choice for various applications in the fields of power management, automotive systems, avionics and consumer electronics.

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