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40VIN/OUT, 2A Synchronous Buck-Boost DC/DC Converter Offers 2.7V to 40V Input & Output Range

Nov 21 2011 - MILPITAS, CA
  • Linear Technology announces the LTC3115-1, a synchronous buck-boost converter that delivers up to 2A of continuous output current from a wide range of power sources from single-cell Li-Ion to 24V/28V industrial rails to 40V automotive inputs. The LTC3115-1’s 2.7V to 40V input and output range provides a regulated output with inputs above, below or equal to the regulated output. The low noise buck-boost topology incorporated in the LTC3115-1 provides a continuous, jitter-free transition between buck and boost modes, making it ideal for RF and other noise-sensitive applications that must maintain a low-noise constant output voltage with a variable input power source. In many applications, battery run time is significantly extended over step-down only solutions. The LTC3115-1’s switching frequency is user programmable between 100kHz and 2MHz, and can be synchronized to an external clock. Proprietary third generation buck-boost PWM circuitry ensures low noise and high efficiency while minimizing the size of external components. The combination of tiny externals and a 4mm × 5mm DFN or TSSOP-20E package provides a compact solution footprint.

    LTC3115-1 PR Image

    The LTC3115-1 incorporates four internal low RDS(ON) N-channel MOSFETs to deliver efficiencies of up to 95%. User-selectable Burst Mode® operation lowers quiescent current to only 50µA, improving light load efficiency and extending battery run time. For noise-sensitive applications, Burst Mode operation can be disabled. Additional features include internal soft-start, programmable undervoltage protection, short circuit protection and output disconnect.


    LTC3115EDHD-1 is available in a 16-lead 4mm × 5mm DFN package and the LTC3115EFE-1 is available in a thermally enhanced 20-lead TSSOP package. Pricing starts at $5.35 each and $5.55 each, respectively for 1,000 piece quantities. Industrial grade versions, the LTC3115IDHD-1 and LTC3115IFE-1, are guaranteed to operate over the –40°C to 125°C operating junction temperature range and are priced at $5.89 and $6.11 each, respectively, in 1,000-piece quantities. All versions are available from stock. For more information, visit www.linear.com/product/LTC3115-1.


    Summary of Features: LTC3115-1


    • 40V, 2A, Synchronous Buck-Boost Regulator
    • Wide VIN Range: 2.7V to 40V
    • Wide VOUT Range: 2.7V to 40V
    • 1A Output Current for VIN ≥ 3.6V, VOUT = 5V
    • 2A Output Current in Step-Down Operation for VIN ≥ 6V
    • Programmable Frequency: 100kHz to 2MHz
    • Supports Synchronization with an External Clock
    • Up to 95% Efficiency
    • 50µA Burst Mode® Quiescent Current
    • Ultralow Noise Buck-Boost PWM
    • Internal Soft-Start
    • 3µA Supply Current in Shutdown
    • Programmable Input Undervoltage Lockout
    • Small 4mm × 5mm × 0.75mm DFN Package
    • Thermally Enhanced 20-Lead TSSOP Package

    40VIN/OUT, 2A Synchronous Buck-Boost DC/DC Converter

    LTC3115-1 PR Image

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