The low-noise, high-efficiency PWM step-down converting power supply composed of MAX887H

Published:2011/6/15 6:59:00 Author:Borg | Keyword: low-noise, high-efficiency, step-down | From:SeekIC

In the figure is an adjustable step-down power supply which is based on the low-noise, high-efficiency PWM and it has a few external elements. The features of the circuit are: (1) the input voltage is 3.5v~11.5v, the output voltage is 1.25v~10.25v; (2) the output current is 600mA, and the static current is 200μA. And when it is standby, the current is only 2.5μA; (3) the switching efficiency is 95%; (4) the stable working frequency of MAX887 is 300kHz, which effectively reduces the sizes and costs of the external elements. The whole circuit can be very small, which is suitable for micro-equipment.



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