LD3985M25R

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The LD3985M25R is a high performance, low-cost linear regulator designed by STMicroelectronics, specifically made to provide a fixed 5V output from a wide range of input voltages. It is a miniaturized device capable of delivering up to 1A of current to meet the power requirements of low power consumer applications. The device is RoHS compliant and operates over a wide temperature range of -40°C to +125°C.

The LD3985M25R offers several features that make it suitable for a variety of application fields and require minimal external components, including an internal safety circuit to protect against damage caused by an overvoltage input and overtemperature conditions. Other features include an adjustable output voltage, low dropout voltage, and high efficiency. It also includes a thermal shutdown and overcurrent protection, which helps to prevent overheating and protect the device from overcurrent conditions by preventing fuses from melting and shorting out.

The main application field of the LD3985M25R is in consumer appliances, such as LCD monitors, digital cameras, and portable devices. It is also suitable for automotive applications, such as those associated with automotive navigation systems, in-dash audio and video devices, and pre-loaded maps.

The LD3985M25R can also be used in industrial and medical applications, such as industrial temperature controllers, robotic controllers and medical devices.

The working principle of the LD3985M25R linear regulator is based on a negative feedback architecture, with the feedback signal being generated by the output voltage. This feedback loop ensures that the output voltage remains constant under varying load and input voltage conditions.

The circuit includes a series pass element, which is a voltage controlled device such as a MOSFET or BJT, which allows current to pass between the input and output of the regulator. The controller adjusts the output voltage level by controlling the amount of current passing through the series pass element.

The current controlling element is a voltage reference, which is a precision voltage of about 5V. The reference voltage is compared to the output voltage to determine if more or less current needs to be allowed to flow.

The regulator is able to maintain the output steady state even when the input and load conditions change, because any increase in input voltage, load current or temperature will increase the voltage drop across the series pass element. The voltage reference will detect this increase and reduce the current passing through the series pass element, thus maintaining the regulated output voltage.

The LD3985M25R linear regulator is a low-cost, high performance device that offers a wide range of applications and requires minimal external components to use. It provides a fixed 5V output with wide input voltages, an adjustable output voltage, low dropout voltage, and high efficiency with an internal safety circuit. It also includes thermal shutdown and overcurrent protection, making it ideal for a variety of consumer, automotive, industrial, and medical applications.

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