65-V Micro-Power Buck Converters for Automation

Texas Instruments recently introduced two 65-V, 150-mA synchronous DC/DC buck converters for powering factory automation and automotive sensor applications. Featuring 10.5-µA quiescent current (IQ), the converters are intended for applications requiring high efficiency. The LM5165 (industrial-grade) and LM5165-Q1 (automotive-grade) micro-power step-down regulators feature a wide input voltage (VIN) range and dual control modes for optimizing efficiency and PCB area.TI UltraLow Buck

Features and benefits

  • Low 10.5-uA standby IQ (operating with no load) enables 90% conversion efficiency at 1-to-10-mA loads to extend battery life in “always on” applications.
  • 100% 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 EMI performance.
  • Fixed 3.3- and 5-V options eliminate external feedback resistor dividers to lower BOM.
  • Programmable current limit optimizes inductor size and cost.

The industrial-grade LM5165 costs $1.35 in 1,000-unit quantities. The automotive-grade LM5165-Q1 costs $1.58.

Source: Texas Instruments