LD2985AM50R

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LD2985AM50R is a three-terminal low-dropout (LDO) linear regulator with a typical dropout voltage of 50mV at 1A. It is designed to generate a very stable output voltage from a wide input voltage range and provides both short circuit and overcurrent protection while ensuring excellent noise immunity. The device is suitable for applications such as automotive, industrial and consumer electronics that require high output current and stability.

The output voltage of LD2985AM50R is set with a single external resistor and can be adjusted from 0.8V to 5.0V. It includes thermal shutdown and current limit protection to protect the device and circuit in fault conditions. The device also features a pulse-skip mode, which can reduce its quiescent current and provide better efficiency than traditional linear regulators.

The LD2985AM50R has a wide input voltage range of 2.8V-18V and can be used for a variety of applications including automotive, telecommunications, consumer electronics, and industrial equipment. In automotive applications, it can be used to power LED headlights, radios, and other electronics on a 12V power system. In consumer electronics, it can be used to power devices such as smartphones, tablets, cameras and wearable medical devices. In industrial applications, it can be used to regulate the output voltage for process control, motor control and other applications.

The working principle of LD2985AM50R is based on the standard LDO regulator circuit. It consists of two transistors, one low-voltage NPN transistor that sets the output voltage, and one high-voltage PNP transistor whose collector is connected to the supply voltage. The PNP transistor is biased by the base-emitter voltage of the NPN. The NPN base is connected to a voltage divider, whose output voltage is the output voltage of the regulator. When the voltage across the output terminal is higher than the voltage of the voltage divider, the current through the NPN transistor increases, causing the base-emitter voltage of the PNP transistor to drop and the output voltage to be regulated.

In a sense, the LD2985AM50R works like a classical negative feedback regulator, where a portion of the output voltage is compared to a reference voltage. The error amplifier creates the control voltage for the pass transistor, which controls the output voltage. The output voltage is regulated to a fixed value and the device is designed to have a minimum load current, allowing it to take full advantage of its low dropout voltage.

The LD2985AM50R is an ideal choice for applications that require high current and stability. It is a very efficient regulator, with a minimal dropout voltage over a wide range of loads. It is also very reliable, featuring short circuit and overcurrent protection, and can operate over a wide temperature range. Its features, combined with its low quiescent current and excellent noise immunity, make it an ideal solution for a variety of powered devices.

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