DESCRIPTION
The LTC®3523/LTC3523-2 combine a 600mA step-up DC/DC converter with a 400mA synchronous step-down DC/DC converter in a tiny 3mm × 3mm package. The 1.2MHz/2.4MHz switching frequencies minimize the solution footprint while maintaining high efficiency. Both converters feature soft-start and internal compensation, simplifying the design.

FEATURES
■ Dual High Efficiency DC/DC Converters:
   Step-Up (VOUT = 1.8V to 5.25V, ISW = 600mA)
   Step-Down (VOUT = 0.615V to 5.5V, IOUT = 400mA)
■ 1.8V to 5.5V Input Voltage Range
■ Up to 94% Effi ciency
■ Pin Selectable Burst Mode® Operation
■ 45μA Quiescent Current in Burst Mode Operation
■ 1.2MHz (LTC3523) or 2.4MHz (LTC3523-2) Switching Frequency
■ Independent Power Good Indicator Outputs
■ Integrated Soft-Start
■ Thermal and Overcurrent Protection
■ <3μA Quiescent Current in Shutdown
■ Small 16-Lead 3mm × 3mm × 0.75mm QFN Package

APPLICATIONS
■ Digital Cameras
■ Medical Instruments
■ Industrial Handhelds
■ GPS Navigators