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STMicroelectronics L7983 Synchronous Step-Down Switching Regulators deliver up to 300mA DC based on peak current mode architecture with output voltage adjustability ranges from 0.85V to VIN. The monolithic L7983 regulators offer a wide input voltage range and adjustable UVLO threshold to meet the specification for the 12V, 24V, and 48V industrial bus standards. A soft-start time is internally fixed and an output voltage supervisor manages the reset phase for any digital load (microcontroller, FPGA, etc.). The internal compensation network features high noise immunity, simple design, and saves on the component cost.
The RST open collector output can also implement output voltage sequencing during the power-up phase. The synchronous rectification, designed for high efficiency at medium to heavy loads, and high switching frequency capability make the size of the application compact. Pulse-by-pulse current sensing on both power elements implements an effective constant current protection.
The “Low Consumption Mode” (LCM) is designed for applications active during idle mode, so it maximizes the efficiency at light load with controlled output voltage ripple. The “Low Noise Mode” (LNM) makes the switching frequency constant overload current range, meeting the low noise application specification. The STMicroelectronics L7983 Synchronous Step-Down Switching Regulators support dynamic LCM to LNM transition.
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