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Step-down DC/DC controller targets N-channel MOSFETs

Posted: 02 Aug 2006     Print Version  Bookmark and Share

Keywords:Linear  LTC3822  DC/DC controller  N-channel MOSFET 

Linear Technology Corp. has announced that it is offering a low input voltage, synchronous step-down DC/DC controller for N-channel MOSFETs. The company said the LTC3822 has a constant frequency-current mode architecture with MOSFET VDS sensing that eliminates the need for sense resistors, reduces solution cost and improves efficiency.

Running on 2.75-4.5V, the device has a maximum duty cycle of 99 per cent that provides low dropout operation. The switching frequency can be programmed for ranges of 300-750kHz, allowing the use of small surface-mount inductors and capacitors. Applications include point-of-load conversion from 3.3VIN and portable devices with single Li-Ion batteries for up to 20A load current requirements.

The LTC3822 promises line and load regulation and fast transient response with its constant frequency current mode operation. Internal soft-start circuitry guarantees controlled startup to minimise inrush current and ensure proper regulation, Linear said. The LTC3822 consumes 340μA during operation and 7.5μA in shutdown.

The LTC3822 is available in thermally enhanced 3-by-3mm DFN and 10-lead MSOP packages. Rated for operations at ranges of -40°C to 85°C, the device has 1,000-piece pricing set at Rs.96.24 ($2.10) each.

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Related Datasheets
Part Number Description Category
LTC3822 No RSENSE, Low Input Voltage, Synchronous Step-Down DC/DC Controller ICs, Interface



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