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DC/DC converter offers output disconnect

Posted: 16 Jan 2008     Print Version  Bookmark and Share

Keywords:synchronous boost DC/DC  output disconnect  Li-ion 

Linear Technology Corp. has announced the LTC3527/-1 dual output 2.2MHz, current mode, synchronous boost DC/DC converters with integrated output disconnect. Their internal 800mA and 400mA switches can deliver output voltages as high as 5.25V from an input voltage of 0.70V (0.5V when running), up to 5V, making them suitable for Li-ion/polymer or single-multicell alkaline/NiMH applications. The LTC3527/-1 can deliver up to 200mA and 100mA of continuous output current (at 3.3V) from a single alkaline cell or 400mA and 200mA from dual cells.

Synchronous rectification enables efficiencies of up to 94 per cent while Burst Mode operation lowers quiescent current to only 12?A, providing extended battery run-time in handheld applications. Selectable 1.2MHz or 2.2MHz operation provides a choice between the highest efficiency or smallest solution footprint. The combination of a 3-by-3mm QFN-16 package and high switching frequency minimise both inductor and capacitor sizes, providing a tiny solution footprint required in handheld applications.

The LTC3527/-1s have the ability to regulate output voltage even when VIN exceeds VOUT, further extending battery run time. The output disconnect feature allows the outputs to be completely open in shutdown, whereas the LTC3527-1 actively discharges VOUT1 and VOUT2 when entering shutdown. Additionally, inrush current limiting minimises input surge currents during start-up. Additional features include anti-ringing control, shortcircuit protection and thermal protection. The LTC3527/-1 deliver a solution for boost applications requiring dual boost channels with up to 400mA of output current and where a small solution size and high battery run-time are key factors.

LTC3527EUD and LTC3527EUD-1 are both available from stock in 16-lead QFN packages. Pricing for 1,000 pieces starts at Rs.116.46 ($2.95) each.

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