Robust synchronous buck converter shrinks board space

14th March 2019
Alex Lynn

A wide-input-voltage (VIN) synchronous DC/DC buck converter with a combination of light load efficiency, ease of design and overall power solution cost has been introduced by Texas Instruments (TI). The 100V, one amp 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 18th to 20th, 2019. Read a short article about the newest innovations in power from TI at APEC, such as new products and end-to-end power-management system solutions including hardware, software and reference designs that can help engineers get to market quickly.

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 one amp DC load current.

The COT architecture requires no external compensation, while an internal VCC bias supply and bootstrap diode eliminates an additional capacitor. The automotive-grade LM5164-Q1 is also available.

The LM5164 and LM5164-Q1 join TI’s portfolio of highly integrated, wide VIN DC/DC converters that enable designers to maximise 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 five by six millimetres, which is reportedly 30% smaller than competitive offerings. Designers can use the LM5164 to create a complete power-supply design in 105mm2, which is more than ten percent smaller than competitive offerings.
  • Highest light load efficiency: The LM5164 offers very low 10µA typical standby quiescent current. This enables ten percent better light load efficiency for 24 to 5V conversions with a 1mA load and extends battery life compared to competitive solutions.
  • Simple, cost-effective design: A standard eight-pin SOIC package, few external components and WEBENCH Power Designer simplify design and reduce cost.

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

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