Integrated 38V synchronous DC-DC converter targets smart industrial designs

Integrated 38V synchronous DC-DC converter targets smart industrial designs

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By Nick Flaherty

STMicroelectronics has launched a 38V/3A synchronous DC-DC converter aimed at smart industrial designs.

The L6983 integrates synchronous MOSFETs on-chip to save external components and simplify design and the controller with a programmable switching frequency from 200kHz to 2.2MHz provides a high efficiency up to 95 per cent across all load conditions. 

The L6983 DC-DC converter has a low quiescent current of just 17µA and low current consumption (L6983C) and low-noise (L6983N) variants are available. The L6983C enters pulse-skipping mode when the load current is below 0.6A while the L6983N, suitable for noise-sensitive applications, stays in PWM (pulse-width modulation) mode at all loads to minimize electromagnetic disturbances.

With a wide input-voltage range from 3.5V to 38V, L6983 converters are an efficient and flexible solution for 12V and 24V industrial bus-powered systems, battery-powered equipment, decentralized intelligent nodes such as smart-building controllers, and always-on devices including smart sensors. They can be ordered with 3.3V, 5V, or adjustable output voltage.

All variants of the L6983 DC-DC converter have 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, over-voltage protection, and soft-start circuitry simplify the design of a complete power-supply system. Frequency spread-spectrum operation and external frequency synchronization ease EMC compliance.

ST has also released the STEVAL-ISA208V1 evaluation board for L6983C to help accelerate device selection and power-supply development.

The L6983C and L6983N are in production now, packaged in 3mm x 3mm QFN16, from $1.50 for orders over 1000 pieces. 



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