DESCRIPTION
The LTC®3522 combines a 400mA buck-boost DC/DC converter with a 200mA synchronous buck DC/DC converter in a tiny 3mm×3mm package. The 1MHz switching frequency minimizes the solution footprint while maintaining high efficiency. Both converters feature internal soft-start and compensation, simplifying the design process.

FEATURES
■ Dual High Efficiency DC/DC Converters:
   Buck-Boost (VOUT: 2.2V to 5.25V, IOUT: 400mA
   for VIN > 3V, VOUT = 3.3V)
   Buck (VOUT: 0.6V to VIN, IOUT: 200mA)
■ 2.4V to 5.5V Input Voltage Range
■ Pin Selectable Burst Mode® Operation
■ 25μA Total Quiescent Current for Both Converters in
   Burst Mode Operation
■ Independent Power Good Indicator Outputs
■ Integrated Soft-Start
■ Thermal and Overcurrent Protection
■ <1μA Quiescent Current in Shutdown
■ Small 0.75mm × 3mm × 3mm QFN Package

APPLICATIONS
■ Flash-Based MP3 Players
■ Medical Instruments
■ Digital Cameras
■ PDAs, Handheld PCs
■ Personal Navigation Devices