TI's 65-V micro-power buck converters feature industry's lowest quiescent current

The wide 3-V to 65-V operating range enables the LM5165 and LM5165-Q1 micro-power regulators 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. Integrated dual metal-oxide semiconductor field-effect transistors (MOSFETs) reduce PCB area, while a programmable current-limit scheme reduces inductor size. Both regulators operate at junction temperatures up to 150ºC for higher temperature environments. The LM5165-Q1 is AEC-Q100 qualified for automotive applications.

LM5165 and LM5165-Q1 key features and benefits

• Low 10.5-uA standby I_Q (operating with no load) enables 90-percent conversion efficiency at 1-mA to 10-mA loads to extend battery life in "always on" applications. Read the blog post "Powering smart sensor transmitters in industrial applications."
• 100-percent duty cycle enables low-dropout operation, while a P-channel high-side MOSFET eliminates the bootstrap diode and capacitor.
• 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. Read the application note "Simple success with conducted EMI from DC/DC converters."
• Fixed 3.3-V and 5-V options eliminate external feedback resistor dividers to lower bill of materials (BOM).
• Programmable current limit optimizes inductor size and cost.

The LM5165 and LM5165-Q1 join TI's family of wide V_IN DC/DC step-down regulators that include the LM5017, LM5160 and TPS54062. Get more information on TI's high-performance DC/DC converter portfolio for any power supply design.

Availability, packaging and pricing

The regulators are available in volume now from TI and its authorized distributors. Packaged in a 10-pin, 3-mm-by-3-mm VSON, the industrial-grade LM5165 is priced at US$1.35 in 1,000-unit quantities and the automotive-grade LM5165-Q1 is priced at US$1.58. Order the high-density COT LM5165EVM-HD-C50X and PFM LM5165EVM-HD-P50A evaluation modules. Download the LM5165 quick-start DC/DC synchronous buck converter design tool and PSPICE transient models.

Find out more about TI's power management portfolio:

• Search for solutions, get help and share knowledge in the TI E2E™ Community Power Management forum.
• Download power reference designs from the TI Designs reference design library.

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