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Linear dc-dc converter offers 96 percent efficiency

Posted: 19 Jan 2004 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? ltc3421? dc/dc converter?

Linear Technology Corp. has released the LTC3421 3MHz, current mode, synchronous boost dc-dc converter with true output disconnect and inrush current limiting.

Suitable for Li-ion and single/multi-cell alkaline/NiMH applications, the product's internal switches provide a 3A current limit and deliver output voltages as high as 5.25V from an input voltage range of 0.5V to 4.5V. It also delivers up to 1.5A of continuous output current from two alkaline cells.

The LTC3421 uses internal switches with an RDS (ON) of 0.10 ohms (n-channel) and 0.14 ohms (p-channel) to deliver efficiencies as high as 96 percent. Either automatic or manual Burst Mode operation can be enabled to reduce no load quiescent current to 12?A. The average current level for enabling Automatic Burst Mode can be programmed by the user via a resistor/capacitor to optimize light load efficiency, while true output disconnect eliminates inrush current and allows zero load current in shutdown.

In noise-sensitive applications, the BURST pin can be configured to provide forced continuous operation to reduce noise and potential RF interference. An open-drain uncommitted low-battery comparator is included and maintains operation in applications with a secondary cell powering the output voltage during shutdown.

Additional features include adjustable current limit, anti-ring control, programmable soft-start, external synchronization capability, a reference output, and thermal protection. The LTC3421EUF is available from stock in a 4-by-4mm 24-lead QFN package. Pricing starts at $3.50 each for 1,000-piece quantities.

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