L7987L

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The L7987L is a DC/DC switching regulator from STMicroelectronics. It is a pulse-width-modulated (PWM) regulator that offers an efficient and highly accurate voltage regulation with low output noise. The L7987L is designed to provide an adjustable voltage (from 0.3V up to 20V) with low drop-out and low quiescent current. It is suitable for applications such as generating reference voltages for analog and digital circuits, as well as for powering small micro-controllers and sensors.

The L7987L works by processing an input voltage (from 1.8V to 20V) and producing a regulated output voltage that is adjustable within a range of 0.3V to 20V. This is accomplished by charging an internal capacitor on each rising edge of the external clock and then discharging the same capacitor into the output when the clock is low. The amount of charge remaining on the capacitor is directly proportional to the output voltage and is maintained within tightly controlled tolerances.

The L7987L features a soft-start circuit that prevents the output from inrush current during start-up, and reduces the current peak in the output stage. It also has integrated protection features such as over-current protection, over-temperature protection, and under-voltage lockout, ensuring reliable operation even in harsh conditions. The device also implements current limitation, which prevents it from overloading even if the output is heavily loaded.

The L7987L is ideal for applications that require a flexible and efficient voltage regulator with a wide range of output voltage options. It is suitable for providing reliable power to micro-controllers and other components in embedded systems, as well as for driving high current, low voltage circuitry in industrial equipment and other applications that require clean and accurate power.

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