Overview
The MAX1565 provides a complete power solution for digital cameras and digital camcorders by integrating an ultra-efficient step-up/step-down DC-DC converter with three auxiliary boost controllers. Suitable for 2-, 3-cell alkaline or NiMH batteries and 1-cell lithium-ion (Li+) battery powered systems.
The step-up DC-DC converter accepts an input voltage of 0.7V to 5.5V and can control the output voltage from 2.7V to 5.5V through resistor regulation. The MAX1565 utilizes an internal MOSFET to achieve 95% efficiency. The adjustable operating frequency allows for flexible optimization of minimum size, lowest cost and highest efficiency.
The step-down DC-DC converter can output voltages as low as 1.25V and achieve 95% efficiency with internal MOSFET switches. The internal soft start reduces the inrush current of the battery. The converter is capable of step-down conversion of the boost converter output, providing up to 90% buck-boost recombination efficiency, allowing the battery voltage to be stepped down directly without buck-boost conversion.
The MAX1565 provides an additional boost controller for driving CCD, LCD, motor excitation, and backlighting. The device is also scalable to support boost, SEPIC, and flyback configurations by providing power, oscillating signals, and reference references to the controller for the MAX1801 in the SOT23 package. The MAX1565 is available in a space-saving 32-pin thin QFN package.
Key characteristics
Step-up DC-DC converter
95% efficiency
3.3V Fixed or 2.7V to 5.5V Adjustable Output Step-Down DC-DC Converter
95% battery buck efficiency with boost converter for 90% buck-boost efficiency adjustable output voltage as low as 1.25V
Three auxiliary PWM controllers up to 1MHz operating frequency
1μA Shutdown Mode Internal Soft-Start Control Overload Protection Compact 32-Pin, 5mm x 5mm Thin QFN Package
application
Digital camera digital camera
PDA
MAX1565 Typical Application Circuit
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