Synchronous 400 mA DC/DC Buck-Boost Converter & 200 mA Synchronous Buck in a 3 × 3 mm QFN

摘要

Linear Technology has announced the LTC3522, a dual channel, 1 MHz synchronous converter. One channel utilizes a synchronous buck-boost topology that can deliver up to 400 mA 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% longer battery run-time. The second channel is a synchronous buck regulator, which can deliver up to 200 mA of continuous output current to voltages as low as 0.6V. This combination is ideal for powering applications such as DSPs and microcontrollers that require both a 3.3V I/O rail and a 0.6V to 1.8V rail for the core voltage. The LTC3522's 1 MHz switching frequency enables the use of tiny, low-cost ceramic capacitors and inductors, which combined with its 3 mm × 3 mm QFN package, provides a compact solution footprint.