Power Converters Claim Lowest No-load Current For Always-on Industrial/Automotive Designs

65-V micro-power buck converters from Texas Instruments feature industry's lowest quiescent current (PRNewsFoto/Texas Instruments)

Texas Instruments unveiled two 65-V DC/DC buck converters which it claims have the industry’s lowest 10.5-uA quiescent current (IQ) for powering factory automation and automotive sensor applications requiring high efficiency.

The industrial-grade LM5165 and automotive-grade LM5165-Q1 micro-power step-down regulators feature a wide 3-V to 65-V operating range enabling them to handle the highest transients in industrial sensor and programmable logic controller (PLC) applications, as well as start-stop and load-dump conditions for 12-V/24-V lead-acid and emerging 48-V lithium-ion automotive batteries

Further, a low 10.5-uA quiescent current (IQ) (operating with no load) enables 90-percent conversion efficiency making the devices suitable for always-on applications.


PCB area is reduced by integrated dual MOSFETs which eliminate the bootstrap diode and capacitor, while a programmable current-limit scheme reduces inductor size and cost.

Another important feature is dual-mode operation. A pulse frequency modulation (PFM) control mode enables the highest efficiency power supply design, while a constant on-time (COT) control mode provides higher output current and better electromagnetic interference (EMI) performance.

Both regulators operate at junction temperatures up to 150ºC for higher temperature environments. The LM5165-Q1 is AEC-Q100 qualified for automotive applications.

The industrial devices are packaged in a 10-pin, 3-mm-by-3-mm VSON package and are available in volume. The COT LM5165EVM-HD-C50X and PFM LM5165EVM-HD-P50A evaluation modules and TI’s WEBENCH Power Design tool are also available to speed development of factory and process automation designs with the devices.

For further information, view the full Press release.

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