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1MHz converter suits DSPs with 3.3V I/O rail

Posted: 21 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:synchronous buck-boost converter? buck-boost topology? DSP? MCU?

Linear Technology announces the LTC3522, a dual channel, 1MHz synchronous converter.

One channel uses a synchronous buck-boost topology that can deliver up to 400mA of continuous output current with inputs above, equal or below the output. In single cell Li-ion applications requiring a 3.3V output, the buck-boost topology enables up to 25 percent longer battery run-time. The second channel is a synchronous buck regulator, which can deliver up to 200mA of continuous output current to voltages as low as 0.6V. This combination is suitable for powering applications such as DSPs and MCUs that require both a 3.3V I/O rail and a 0.6V to 1.8V rail for the core voltage.

LTC3522's 1MHz switching frequency, enables the use of tiny, low cost ceramic capacitors and inductors, combined with its 3-by-3mm QFN package, it provides a compact solution footprint.

The device's unique synchronous buck-boost topology on its 400mA channel enables it to regulate a constant output voltage when the input voltage is above, equal to or below the output, allowing it to use the entire stored energy of the Li-ion battery. LTC3522 uses automatic Burst Mode operation, requiring only 25?A (both channels) of no load quiescent current. For applications that require very low noise, the Burst Mode function can be defeated and replaced with a continuous PWM mode. Shutdown current is less than 1?A, further extending battery run-time. Each channel has independent internal soft-start ensuring design flexibility. Other features include short-circuit protection, overtemperature protection and a power good flags

LTC3522EUD is available from stock in a 16-lead 0.75-by-3-by-3mm QFN package. Pricing is $2.50 each for 1,000-piece quantities.

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