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


Linear Technology has announced 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 x 5mm DFN or TSSOP-20E package provides a compact solution footprint.

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 x 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

Summary of Features of the 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 

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