3V/5V 双电源系统中的电源保护

节能是低电源电压和便携式电子系统的共同点。派拉蒙需要电池和便携式电子产品中 — — 节省电源 — — 也是从 5V 到 3.3 v （和更低） 的供应 rails 的最大益处。即便如此，多数 3.3 v 设计，以及，业界都还没有提供完整的选择的 3.3 v 的设计师包括 5V ICs 功能。之前，很多便携式产品必须运作上的 3.3 v 和 5V 混合 ICs。

Maxim > App Notes > BATTERY MANAGEMENT POWER-SUPPLY CIRCUITS

Keywords: Power Conservation in 3V/5V Dual-Supply Systems Feb 06, 2001

APPLICATION NOTE 662
Power Conservation in 3V/5V Dual-Supply Systems
Power saving is the common denominator for lower supply voltage and portable electronic systems. The
paramount need in battery-powered and portable electronics―saving power―is also the major benefit in moving
from 5V to 3.3V (and lower) supply rails. Even so, most 3.3V designs include 5V ICs as well, as the industry has
not yet provided designers with a complete selection of 3.3V functions. Until it does, many portable products
must operate on a mixture of 5V and 3.3V ICs.

As explained in the discussion that follows, a designer with adequa