2-A synchronous buck-boost DC/DC converter
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 extended over step-down only solutions.
The LTC3115-1’s switching frequency is user programmable between 100 kHz and 2 MHz, 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 4 mm x 5 mm 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 50 μA, 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 4 mm x 5 mm DFN package and the LTC3115EFE-1 is available in a thermally enhanced 20-lead TSSOP package.
For further information: www.linear.com/product/LTC3115-1.
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