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DC/DC converter suits Li-ion apps

Posted: 13 Dec 2005 ?? ?Print Version ?Bookmark and Share

Keywords:Linear Technology? LTC3422? DC/DC converter?

Linear Technology announces the LTC3422, a 3MHz, current mode, synchronous boost DC/DC converter with true output disconnect, inrush current limiting and integrated soft-start. Its internal switches provide a 1.5A current limit (min) and deliver output voltages as high as 5.25V from an input voltage range of 0.5V to 4.5V, making it suitable for Li-Ion and single/multicell alkaline/NICd/NiMH applications.

The LTC3422 delivers up to 700mA of continuous output current (at 5V) from a single cell Li-ion input. Synchronous rectification enables efficiencies of up to 96 percent while Burst Mode operation lowers quiescent current to 25?A, providing maximum battery run-time in handheld applications. According to the company, the combination of a 3-by-3mm DFN package and a constant switching frequency of up to 3MHz minimize both inductor and capacitor sizes, providing a tiny solution footprint required in handheld applications.

The LTC3422 uses internal switches with an RDS(ON) of 0.20 ohm (N-Channel) and 0.24 ohm (P-Channel) to deliver efficiencies as high as 96 percent. The true output disconnect feature allows the output to be completely discharged in shutdown. It also limits the inrush of current during start-up, minimizing surge currents seen by the input supply. Additional features include anti-ringing control, short-circuit protection, programmable soft-start, and thermal protection.

The LTC3422EDD is available from stock in a 10-lead DFN package, with 1,000-piece pricing starting at $2.95 each.

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Related Datasheets
Part Number Description Category
? LTC3422 1.5A, 3MHz Synchronous Step-Up DC/DC Converter with Output Disconnect ICs, Interface



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