Dual 550mA, 1MHz Synchronous Boost Regulator

April 17, 2009
Linear Technology's LTC3535 is a dual-channel 1MHz, current mode synchronous boost dc-dc converter. Each Channel Delivers 3.3V at 100mA from a Single Alkaline/NiMH Cell or 3.3V at 200mA from Two Cells.

Linear Technology Corporation announces the LTC3535, a dual-channel 1MHz, current mode synchronous boost DC/DC converter with integrated output disconnect and soft-start. The LTC3535's internal 550mA switches deliver output voltages as high as 5.25V from a
n input voltage range of 0.7V start-up, 0.5V when running to 5V, making it ideal for single- or multicell alkaline/NiMH as well as Li-Ion/Polymer applications.

Each of the LTC3535's channels has it own power input and is completely independent, offering maximum design flexibility. For example, one channel can deliver up to 50mA of continuous output current at 3.3V while the other channel delivers up to 100mA at 1.8V to power a microcontroller from a single alkaline cell. The 1MHz switching frequency minimizes external component sizes while providing up to 94% efficiency. Combined with a compact 3mm x 3mm DFN-12 package, the LTC3535 dual channel boost provides the tiny and efficient solution footprint required in handheld applications.

Burst Mode® operation lowers quiescent current to only 18uA (both channels), providing extended battery run time in handheld applications. The LTC3535 is an ideal part for handheld dual boost applications in which small solution size and maximum battery run time are defining factors.

LTC3535EDD is available from stock in 12-lead 3mm x 3mm DFN package. 1,000-piece pricing starts at $2.95 each.

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