STMicroelectronics’ DC-DC Converters for Smart Industrial Applications

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  • Integrated on-chip MOSFET reduces additional components
  • Low-current consumption and suitable for low-noise applications

STMicroelectronics has launched the L6983 38V/3A synchronous DC-DC converters that maintain high efficiency of 95 per cent at all loads. An integrated on-chip synchronous MOSFET helps reduce external components and therefore simplify the design.

 The L6983 converters (L6983C for low current consumption and L6983N for low-noise) have extremely low quiescent current of just 17µA. The L6983C enters pulse-skipping mode when the load current goes below 0.6A, while the L6983N stays in PWM (pulse-width modulation) mode at all loads to minimize electromagnetic disturbances.

Wide voltage and frequency range

 A wide input voltage range from 3.5V to 38V allows L6983 converters to be 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.

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All L6983 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, over-voltage protection and soft-start circuitry simplify the design of a complete power-supply system. The switching frequency is programmable from 200kHz to 2.2MHz. Frequency spread-spectrum operation and external frequency synchronization ease EMC compliance.

 

Availability

 

The L6983C and L6983N are in production now, packaged in 3mm x 3mm QFN16.

 

The STEVAL-ISA208V1 evaluation board for L6983C helps accelerate device selection and power-supply development.


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