Suitable for pager unit cell MAX1678 high-efficiency step-up power supply configuration


Posted on Mar 28, 2007

As shown in FIG suitable for use in high-efficiency single pager battery power boost. It is composed of a MAX1678 and three external components. MAX1678 is designed for l to tw


Suitable for pager unit cell MAX1678 high-efficiency step-up power supply configuration
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o battery-powered low-power applications and design. It uses ultra-small 8-pin, MAX package. No external MOSFET and Schottky diode, reducing the cost and size of the system cost. Chip with a battery voltage detection circuit, the noise suppression circuit. MAX1678 uses a proprietary constant peak current control principle, it is not only to maintain the traditional PWM converters low quiescent current, full load and with high efficiency and low output voltage ripple. It consists of a step-up switching power supply, can work in 0.7V input voltage, output voltage is preset at 3.3V. Its characteristics are: efficiency above 90%; the input voltage is 0.85V to start; 45mA output current (1.2V to rise to 3.3V); quiescent current of 37 A, shutdown current 2 A; small, small external components, simple structure.




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