超小型、超高効率、5チャネルディジタルカメラ用電源
SUNNYVALE, CA-February 14, 2003-Maxim Integrated Products
(NASDAQ: MXIM) introduces 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 over 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). The MAX1565ETJ price starts at $2.60 (1000-up, FOB USA). An evaluation kit is available to speed designs.
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