Low-quiescent current multi-mode 2A DC/DC boost converter

July 08, 2016 // By Graham Prophet
LT8335 is a current mode, 2 MHz 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.

The LT8335 can be configured as either a boost, SEPIC or an inverting converter. It uses a fixed 2 MHz switching frequency, enabling designers to minimize external component sizes and avoid critical frequency bands, such as AM radio. Burst Mode operation reduces quiescent current to 6 µA while keeping output ripple below 15 mVP-P. The combination of a 3 x 2 mm DFN package and tiny externals ensures a very compact footprint while minimizing cost.


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


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


Linear Technology; www.linear.com/product/LT8335