提高电池和USB电源之间的转换开关

摘要：本应用笔记介绍了电路之间无缝切换电池供电和USB供电，以最小的电路。该设计采用一个升压转换器架构，在一个LDO （ MAX1792 ）之间连接的USB电源线和一个升压转换器的输出（ MAX1795/MAX1796/MAX1797 ） 。

Maxim > App Notes > Circuit Protection Interface Circuits Power-Supply Circuits

Keywords: LDO linear regulators, step-up converters, boost converters, USB power, battery operation, hot Sep 16, 2009
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APPLICATION NOTE 4445
Boost Converter Switches Between Battery and USB Power
By: Kazuma Akabane


Abstract: This application note presents a circuit that switches seamlessly between battery power and USB
power with minimal circuitry. The design uses a step-up converter architecture in which an LDO (the
MAX1792) is connected between the USB power line and the output of a step-up converter (the MAX1795/
MAX1796/MAX1797).

This design idea appeared in the November 1, 2006 issue of EE Times Japan, and was posted on the EE Times
US website on November 21, 2006.

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