MAX1584

19-2883; Rev 0; 7/03 KIT ATION EVALU E L B A AVAIL 5-Channel Slim DSC Power Supplies General Description Features o Step-Up DC-DC Converter, 95% Efficient o Step-Down DC-DC Converter Operate from Battery for 95% Efficient Step-Down 90% Efficient Boost-Buck with Step-Up o Three Auxiliary PWM DC-DC Controllers o No Transformers (MAX1585) o Up to 1MHz Operating Frequency o 1mA Shutdown Mode o Internal Soft-Start Control o Overload Protection o Compact 32-Pin Thin QFN Package (5mm x 5mm) MAX1584/MAX1585 The MAX1584/MAX1585 provide a complete powersupply solution for slim digital cameras. They improve performance, component count, and size compared to conventional multichannel controllers in 2-cell AA, 1-cell Li+, and dual-battery designs. On-chip MOSFETs provide up to 95% efficiency for critical power supplies, while additional channels operate with external FETs for optimum design flexibility. This optimizes overall efficiency and cost, while also reducing board space. The MAX1584/MAX1585 include 5 high-efficiency DCDC conversion channels: Step-up DC-DC converter with on-chip FETs Step-down DC-DC converter with on-chip FETs Three PWM DC-DC controllers for CCD, LCD, LED, or other functions The step-down DC-DC converter can operate directly from the battery or from the step-up output, providing boost-buck capability with a compound efficiency of up to 90%. Both devices include three PWM DC-DC controllers: the MAX1584 includes two step-up controllers and one step-down con...