STMicroelectronics’ L6983 38 V/3 A synchronous DC/DC converters maintain high efficiency at all loads with a maximum value of 95% and are highly integrated with synchronous MOSFETs on-chip to save external components and simplify design.
The L6983 converters have extremely 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 minimize electromagnetic disturbances.
With a wide input-voltage range from 3.5 V to 38 V, L6983 converters are an efficient and flexible solution for 12 V and 24 V 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 3.3 V, 5 V, or adjustable output voltage.
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| Efficiency VIN = 12 V; VOUT = 5 V; FSW = 0.4 MHz. |
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 200 kHz to 2.2 MHz. 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.
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| 38 V, 3 A synchronous step-down switching regulator evaluation board based on the L6983NQTR. |
The L6983C and L6983N are in production now, packaged in 3 mm × 3 mm QFN16, from $1.50 for orders over 1000 pieces.
