The MAX1802 provides a complete power-supply solution for digital still cameras and video cameras by integrating two high-efficiency step-down DC-DC converters and three auxiliary step-up controllers. This complete solution is targeted for applications that use either three to four alkaline cells or two lithium-ion (Li+) cells. The main step-down DC-DC controller accepts inputs from 2.5V to 11V and regulates a resistor-adjustable output from 2.7V to 5.5V. It uses a synchronous rectifier to regulate the output with up to 94% efficiency. An adjustable operating frequency (up to 1MHz) facilitates designs for optimum size, cost, and efficiency. The core step-down DC-DC converter accepts inputs from 2.7V to 5.5V and regulates a resistor-adjustable output from 1.25V to 5.5V. It delivers 500mA with up to 94% efficiency. The three auxiliary step-up controllers can be used to power the digital camera's CCD, LCD, and backlight. The MAX1802 also features expandability by supplying power, an oscillator signal, and a reference to the MAX1801, a low-cost slave DC-DC controller that supports step-up, single-ended primary inductance converter (SEPIC), and fly-back configurations. The MAX1802 is available in a space-saving 32-pin TQFP package (5mm x 5mm body), and the MAX1801 is available in an 8-pin SOT-23 package. An evaluation kit (MAX1802EVKIT) featuring both devices is available to expedite designs. Applications * Digital Still Cameras * Digital Video Cameras * DVD Players * Handheld Devices * Internet Access Tablets * PDAs * 2.5V to 11V Input Voltage Range * Main DC-DC Controller * 94% Efficiency * +2.7V to +5.5V Adjustable Output Voltage * Up to 100% Duty Cycle * Independent Shutdown * Core DC-DC Converter * 94% Efficiency * Up to 500mA Load Efficiency * Output Voltage Adjustable Down to 1.25V * Independent Shutdown * Three Auxiliary DC-DC Controllers * Adjustable Maximum Duty Cycle * Independent Shutdown * Power, Oscillator, and Reference Outputs to Drive External Slave Controllers (MAX1801) * Up to 1MHz Switching Frequency * 3µA Supply Current in Shutdown Mode * Internal Soft-Start * Overload Protection for All DC-DC Converters * Compact 32-Pin TQFP Package