L7987TR

The L7987TR is a DC DC switching regulator that is used to provide regulated output voltages as low as 2.5V, or up to 24V, given an appropriately sized input voltage, at up to 3A output current. The part features an adjustable output voltage, an input voltage range of 3 V to 45V, a power saving shutdown mode, a 1 MHz operating frequency, and an integrated FET and current sensing circuitry, allowing for the efficient use of power. It is designed to support a wide variety of input sources, such as AC line voltages, batteries and solar panels.

The device has an external circuit that contains an on-chip transistor, an adjustable voltage reference, and a current sensing circuit. All of these components form a complete and highly efficient power supply circuit. The switching frequency is 1 MHz, allowing for significant increases in efficiency over conventional regulators. Further, the device includes an internal thermal shutdown, current limit and short circuit protection, making it safe to implement in hostile environments.

The device can be used in a variety of applications. It is commonly used to power portable devices and electronics, such as smartphones and tablets, which require highly efficient, low-power consumption power conversion. It is also used in motor control and home automation, as well as in industrial, medical and military applications. The device can be implemented as a step-down regulator, which steps down the input voltage to the desired output voltage, or as a buck-boost regulator, where the output voltage is higher than the input.

In a step-down application, the input voltage must be greater than the desired output voltage. The device uses an adjustable voltage reference and an on-chip NMOS transistor to achieve the desired output voltage. It also features integrated current sensing and protection circuitry, as well as an internal thermal shutdown that activates at a predetermined temperature. To achieve optimal efficiency, the input voltage should be adjusted to match the output voltage as closely as possible.

In a buck-boost application, the device senses the input voltage and adjusts the on-chip NMOS transistor accordingly to match the output voltage. The voltage reference is adjusted in the positive direction to increase the output voltage, or in the negative direction to reduce it. In this manner, the device can efficiently generate output voltages that are higher or lower than the input voltage.

The L7987TR is a compact, efficient DC-DC switching regulator that provides an adjustable output voltage, along with integrated current sensing and protection circuitry. It is designed for applications such as portable electronics, motor control, home automation, and industrial, medical, and military applications. It is capable of providing an output voltage as low as 2.5V, and up to 24V, at up to 3A output current. It can also be operated as either a step-down or buck-boost regulator, providing a high level of flexibility and efficient operation.