MAX1802

Digital Camera Step-Down Power Supply

Complete Power-Supply Solution for Digital Camera Delivers 5 Outputs from 2 Li+ or 4 AA Cells


Please check latest availability status for a specific part variant.

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.

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.
MAX1802: Typical Operating Circuit MAX1802: Typical Operating Circuit Enlarge+

Key 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/Uses

  • Digital Still Cameras
  • Digital Video Cameras
  • DVD Players
  • Handheld Devices
  • Internet Access Tablets
  • PDAs
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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