DC/DC converter with internal 500mA, 140V switch

Linear Technology Corporation announces the LT8331, a current mode step-up DC/DC converter with an internal 500mA, 140V switch. It operates from an input voltage range of 4.5V to 100V, making it suitable for use with a wide range of input sources found in industrial, transportation and avionic applications. The LT8331 can be configured as either a boost, SEPIC, flyback or inverting converter. Its switching frequency is programmable from 100kHz to 500kHz, enabling designers to minimise external component sizes. Burst Mode operation reduces quiescent current to only 6µA while keeping output ripple below 20mV_P-P. The combination of a high voltage MSOP-16E package and tiny externals ensures a very compact footprint while minimising solution cost.

The LT8331’s internal high efficiency 0.5A switch delivers efficiencies of up to 90 per cent. A single feedback resistor sets the output voltage whether the output is positive or negative, minimizing external components. The LT8331’s SYNC/MODE pin enables synchronisation to an external clock or it can be used to select between Burst Mode operation for ultralow I_Q or pulse-skipping mode for the lowest possible noise. Other features include programmable under-voltage lockout (UVLO), internal soft-start, frequency foldback and thermal shutdown protection.

The LT8331EMSE is available in a high voltage MSOP-16E package. An industrial temperature (˗40°C to 125°C) version, the LT8331IMSE, is also available. Pricing starts at $2.95 each for 1,000-piece quantities and both versions are available from stock.