General Description

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.

Features

♦ 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

Applications

Digital Still Cameras

Digital Video Cameras

Hand-Held Devices

Internet Access Tablets

PDAs

DVD Players