100V, 1A Step-Down DC-DC for Industrial and Automotive

Texas Instruments (TI) introduced 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. The 100V, 1A LM5164 step-down voltage converter shrinks board space in rugged battery-powered industrial and automotive power supplies.

TI says that when used in conjunction with the company’s WEBENCH® Power Designer, this new step-down dc-dc converter can enable simpler, faster power conversion design. The integrated, wide-VIN dc-dc buck regulator extends battery life in rugged industrial and automotive applications

TI will demonstrate the LM5164 buck converter (see image above) 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 6V to 100V and delivers up to a 1A dc load current.

The COT architecture requires no external compensation, while an internal VCC bias supply and bootstrap diode eliminates an additional capacitor.

Designers can achieve longer lasting 13S, 48V lithium-ion battery packs for e-bikes and e-scooters with the 13S, 48V li-ion battery pack reference design.

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 maximize power delivery in the smallest package possible.

Key features and benefits of the LM5164

The new device’s thermally efficient, small-outline integrated circuit (SOIC) PowerPAD™ package measures 5mm by 6mm, which TI says is 30 percent smaller than competitive offerings. Designers can use the LM5164 to create a complete power-supply design in 105mm2, which is more than 10 percent smaller than the competition.

The LM5164 offers 10µA typical standby quiescent current. This low standby quiescent current enables 10% better light load efficiency for 24V to 5V conversions with a 1mA load and extends battery life compared to competitive solutions.

According to TI, a standard 8-pin SOIC package with few external components and WEBENCH® Power Designer, simplify design and reduce cost.



  • Designed for reliable and rugged applications
    • Wide input voltage range of 6V to 100V
    • Junction temperature range: -40°C to +150°C
    • Fixed 3ms internal soft-start timer
    • Peak and valley current-limit protection
    • Input UVLO and thermal shutdown protection
  • Suited for scalable Industrial power supplies and battery packs
    • Low minimum on- and off-times of 50ns
    • Adjustable switching frequency up to 1MHz
    • Diode emulation for high light-load efficiency
    • 10.5µA no-load input quiescent current
    • 3µA shutdown quiescent current
    • Optimized for CISPR 32 EMI standard
  • Integration reduces solution size and cost
    • COT mode control architecture
    • Integrated 0.725Ω NFET buck switch supports wide duty-cycle range
    • Integrated 0.34Ω NFET synchronous rectifier eliminates external Schottky diode
    • 1.2V internal voltage reference
    • No loop compensation components
    • Internal Vcc bias regulator and boot diode
    • Open-drain power good indicator
    • 8-Pin SOIC package with PowerPAD
  • Create a custom design using WEBENCH Power Designer


Pricing and availability

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

Texas Instruments
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