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PDA及笔记本电脑等便携式产品若采用锂电池为其微处理器供电,在一般情况下都会采用小型而又具能源效益的降压直流-直流转换器。若以转换效率作为衡量标准,开关稳压器才是佳的选择。若元件高度受到限制,便不能使用电感(移动电话等便携设备常受此限制)。在这种情况下,采用低压降(LDO)线性稳压器作为转换器可能是一个较为理想的选择。只要微处理器电压接近电池电压,外型小巧且成本低廉的低压降芯片便可发挥其最高的效率。若电压差距太大,低压降芯片的效率便会大打折扣。
Portable devices such as PDAs and laptops, which use lithium batteries to power their microprocessors, typically use small, energy-efficient buck DC-DC converters. If the conversion efficiency as a measure of switching regulator is the best choice. Inductors can not be used if the component height is limited (portable devices such as mobile phones are often subject to this limitation). In this case, using a low dropout (LDO) linear regulator as a converter may be a better choice. As long as the microprocessor voltage close to the battery voltage, compact and low-cost low-drop chip can exert its highest efficiency. If the voltage difference is too large, the efficiency of low dropout chip will be greatly reduced.