Step-up DC-DC converter operates from up to 25V range

Article By : Linear Technology

It utilises a fixed 2MHz switching frequency, enabling designers to minimise external component sizes and avoid critical frequency bands.

Linear Technology has unveiled the LT8335, a current mode, 2MHz step-up DC-DC converter with an internal 2A, 28V switch. It operates from an input voltage range of 3V to 25V, suitable for applications with input sources ranging from a single-cell Li-Ion to automotive inputs, according to the company.

The LT8335 can be configured as either a boost, SEPIC or an inverting converter. It utilises a fixed 2MHz switching frequency, enabling designers to minimise external component sizes and avoid critical frequency bands, such as AM radio. Burst Mode operation reduces quiescent current to only 6µA while keeping output ripple below 15mVP-P.

__Figure 1:__ *Typical application (Source: Linear)*

The combination of a 3mm x 2mm DFN package and tiny externals ensures a very compact footprint while minimising solution cost.

The LT8335’s 170mΩ switch delivers efficiencies of over 90%, while programmable undervoltage lockout (UVLO) optimises system performance. A single feedback resistor sets the output voltage whether the output is positive or negative, minimising external components. Other features include internal compensation, soft-start, frequency foldback and thermal shutdown protection.

The LT8335EDDB is available in a 3mm x 2mm DFN-8 package. An industrial temperature (–40°C to 125°C) version, the LT8335IDDB, is also available. Pricing starts at $2.55 each for 1,000 piece quantities.