STMicroelectronics L6983 DC/DC converters

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STMicroelectronics’ L6983 38V/3A synchronous DC/DC converters maintain high efficiency at all loads with a maximum value of 95% and are integrated with synchronous MOSFETs on-chip to save external components and simplify design.

The converters have low quiescent current of just 17 µA. Low current consumption (L6983C) and low-noise (L6983N) variants are available. The L6983C enters pulse-skipping mode when the load current is below 0.6 A while the L6983N, suitable for noise-sensitive applications, stays in PWM (pulse-width modulation) mode at all loads to minimise electromagnetic disturbances.

With a wide input-voltage range from 3.5 to 38 V, the converters are an efficient and flexible solution for 12 and 24 V industrial bus-powered systems, battery-powered equipment, decentralised intelligent nodes such as smart-building controllers and always-on devices including smart sensors. They can be ordered with 3.3 V, 5 V or adjustable output voltage.

All variants feature a Power-Good output pin that can be used for power-up/power-down sequencing, enabling logic circuitry, or as a fault indicator. In addition, integrated feedback-loop compensation, overvoltage protection and soft-start circuitry simplify the design of a complete power-supply system. The switching frequency is programmable from 200 kHz to 2.2 MHz. Frequency spread-spectrum operation and external frequency synchronisation ease EMC compliance.

For more information: www.st.com/l6983-pr.