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Digital camera power supply

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MAXIM Integrated Products, represented by Arrow Electronics , has introduced the MAX1565, the smallest and highest efficiency power supply solution for digital still cameras and video cameras.

The MAX1565 integrates high-efficiency step-up and step-down dc-dc converters with three step-up controllers, providing a 5-channel power management IC.

The MAX1565 provides all voltage outputs required in most digital camera designs.

The internal switch step-up and step-down dc-dc converters include synchronous rectifiers to give 95% efficient conversion for the logic and core supplies (which use more than 60% of the camera's power).

They provide complete power for the 3.3V logic, and 1.5V or 1.8V core supply.

The three step-up controllers supply power for a white LED (W-LED) or CCFL backlight module, positive and negative CCD biases, motor drivers, and positive and negative LCD biases.

All supplies have independent on/off control.

The MAX1565's 5mm x 5mm thin QFN package is 70% smaller than existing solutions using all controllers.

This device also eliminates 27 external components such as diodes, external power switches, resistors and capacitors, and saves 63% board space.

The dc-dc converter's switching frequency is adjustable up to 1MHz, permitting optimum size, cost, and efficiency.

The input voltage range is 0.7V to 5.5V, and it is intended for single-cell, lithium-ion (Li+), and 2- or 3-cell alkaline battery inputs.

If more voltages are required in the system, the MAX1565 can be expanded with minimal cost.

It supplies power, an oscillator signal, and a reference to one or more MAX1801 slave controllers.

The MAX1801 is a low-cost SOT, low-side dc-dc controller for step-up, SEPIC, and fly-back configurations for accessories such as motor drives for zooming and focusing.

Up to five slave controllers can be added.

The MAX1565 is screened for the extended-industrial temperature range (-40°C to +85°C). An evaluation kit is available to speed designs.

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