Analog Devices Inc. LTC3118 Buck-Boost DC/DC Converters

Analog Devices Inc. LTC3118 Buck-Boost DC/DC Converters have a dual input and wide voltage range. The converters offer an intelligent, integrated, low-loss PowerPath™ control and unique power switch architecture. The low-noise, current mode architecture with a fixed 1.2MHz PWM provides efficient operation from either input source to a programmable output voltage. Flexible voltage capability of up to 18V and voltage margin makes the LTC3118 excellent for a wide variety of applications and power sources. 

Analog Devices LTC3118 features include 2µA shutdown current, short circuit protection, and thermal overload. The converter is available in a thermally enhanced 24-lead 4mm x 5mm QFN and 28-lead TSSOP packages.


  • Ideal diode or priority VIN select modes
  • 2.2V to 18V VIN1 and VIN2 range
  • 2V to 18V VOUT range
  • Either VIN can be above, below, or equal to VOUT
  • Generates 5V at 2A for VIN > 6V
  • 1.2MHz low noise fixed frequency operation
  • Current mode control
  • All internal N-channel MOSFETs
  • Pin-selectable PWM or Burst Mode® operation
  • Accurate, independent RUN pin thresholds
  • Up to 94% efficiency
  • VIN and VOUT power good indicators
  • IQ of 50μA in sleep, 2μA in shutdown
  • 4mm × 5mm 24-lead QFN or 28-lead TSSOP packages


  • Systems with multiple input sources
  • Back up power systems
  • Wall adapter or Li-Ion(s) input to 5VOUT
  • Battery or supercapacitor input for reserve power
  • Replace diode-OR designs with higher efficiency, flexibility, and performance

Typical Application Circuit

Application Circuit Diagram - Analog Devices Inc. LTC3118 Buck-Boost DC/DC Converters
Published: 2017-04-25 | Updated: 2022-03-11