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40VIN/OUT, 1A Synchronous Buck-Boost DC/DC Converter Offers 2.7V to 40V Input & Output Range

Apr 29 2014 - MILPITAS, CA
  • The LTC3114-1 is a synchronous, current-mode buck-boost converter that delivers up to 1A of continuous output current from a wide range of power sources, including single-cell Li-Ion, 24V/28V industrial rails and 40V automotive inputs. The LTC3114-1’s 2.2V to 40V input and 2.7V to 40V output range provides a regulated output with inputs above, below or equal to the regulated output, maximizing power source flexibility and extending battery run time over step-down only solutions. The proprietary low noise buck-boost topology incorporated in the LTC3114-1 provides a continuous jitter-free transition between buck and boost modes, making it ideal for RF and other noise-sensitive applications.


    The device’s selectable Automatic Burst Mode® operation lowers quiescent current to only 30µA, improving light load efficiency and further extending battery run time. The LTC3114-1 uses a constant 1.2MHz switching frequency and features pin-programmable average output current and current monitor. Proprietary buck-boost PWM circuitry ensures low noise and high efficiency while minimizing the size of external components. The combination of tiny externals and a 3mm × 5mm DFN or TSSOP-16E package provides a compact solution footprint.


    The LTC3114-1 incorporates four internal low RDS(ON) N-channel MOSFETs to deliver efficiencies of up to 96%. Automatic Burst Mode operation lowers quiescent current to only 30µA, improving light load efficiency and extending battery run time. For noise-sensitive applications, Burst Mode operation can be disabled. Furthermore, current-mode control improves line and load transient responses while keeping compensation simple. Additional features include internal soft-start and inrush current limit, undervoltage lockout, thermal overload protection, short-circuit protection and output disconnect.


    LTC3114EDHC-1 is available in a 16-lead 3mm × 5mm DFN package and the LTC3114EFE-1 is in a thermally enhanced 16-lead TSSOP package. Pricing starts at $3.95 each for 1,000 piece quantities. Industrial grade versions, the LTC3114IDHC-1 and LTC3114IFE-1, are guaranteed to operate over the –40°C to 125°C operating junction temperature range, priced at $4.35 and $4.51 each, respectively, in 1,000-piece quantities. High temperature grade versions, the LTC3114HDHC-1 and LTC3114HFE-1, are guaranteed to operate over the –40°C to 150°C operating junction temperature range, priced at $4.60 and $4.76 each, respectively, in 1,000-piece quantities. Finally high reliability versions, the LTC3114MPDHC-1 and LTC3114MPFE-1, are guaranteed to operate over the –55°C to 150°C operating junction temperature range, priced starting at $11.73 each, in 1,000-piece quantities. All versions are available from stock. For more information, visit www.linear.com/product/ltc3114-1.


    Summary of Features: LTC3114-1


    • Regulates VOUT Above, Below or Equal to VIN
    • Single Inductor
    • Wide VIN Range: 2.2V to 40V
    • Wide VOUT Range: 2.7V to 40V
    • 1A Output Current in Buck Mode
    • 0.5A Output Current, VIN = 3.6V, VOUT = 5V
    • Programmable Average Output Current
    • Up to 96% Efficiency
    • Burst Mode® Operation, 30µA No-Load IQ
    • Current-Mode Control
    • 1.2MHz Ultralow Noise PWM
    • Accurate RUN Pin Threshold
    • Thermally Enhanced, 16-Lead 3mm × 5mm DFN & TSSOP Packages

    40VIN/OUT, 1A Synchronous Buck-Boost DC/DC Converter

    LTC3114-1 PR Image

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