Synchronous buck converter enables efficiency and simplifies power-supply design


Texas Instruments (TI) introduced a wide-input-voltage (VIN) synchronous DC/DC buck converter with the industry’s best combination of light load efficiency, ease of design and overall power solution cost. The 100-V, 1-A LM5164 step-down voltage converter shrinks board space in rugged battery-powered industrial and automotive power supplies. Used in conjunction with TI’s WEBENCH Power Designer, this new DC/DC converter can enable simpler, faster power conversion design.

TI will demonstrate the LM5164 buck converter along with the LM5180 primary-side regulated flyback converter in booth No. 511 at the Applied Power Electronics Conference (APEC) in Anaheim, California, March 18-20, 2019.

The LM5164 is an easy-to-use, ultra-low quiescent current (IQ) synchronous step-down buck regulator that features a constant on-time (COT) control architecture and integrates high- and low-side power MOSFETs. The highly efficient buck converter operates from a wide input voltage of 6 V to 100 V and delivers up to a 1-A DC load current. The COT architecture requires no external compensation, while an internal VCC bias supply and bootstrap diode eliminates an additional capacitor.

The LM5164 and LM5164-Q1 join TI’s portfolio of highly integrated, wide VIN DC/DC converters that enable designers to maximize power delivery in the smallest package possible.

Key features and benefits of the LM5164

  • Shrink board space: The new device’s thermally efficient, small-outline integrated circuit (SOIC) PowerPAD package measures 5 mm by 6 mm, which is 30 percent smaller than competitive offerings. Designers can use the LM5164 to create a complete power-supply design in 105 mm2, which is more than 10 percent smaller than competitive offerings.
  • Highest light load efficiency:The LM5164 offers very low 10-µA typical standby quiescent current. This enables 10 percent better light load efficiency for 24-V to 5-V conversions with a 1-mA load and extends battery life compared to competitive solutions.
  • Simple, cost-effective design:A standard 8-pin SOIC package, few external components and WEBENCH Power Designer simplify design and reduce cost.

Pricing and availability

Available through the TI store and authorized distributors, the 100-V LM5164 and LM5164-Q1 are priced in small reels at US$1.53 and US$2.04, respectively, for 1,000-unit quantities. TheLM5164-Q1EVM-041 evaluation module is available for US$75.