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AN002 Datasheet(PDF) 1 Page - Analog Intergrations Corporation |
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AN002 Datasheet(HTML) 1 Page - Analog Intergrations Corporation |
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1 / 5 page  AN002 May 1997 1 Two-Cell, Step-Up Converter Design for Portable Applications Introduction In recent years, the markets for portable electrical devices, such as the electronic dictionary, palmtop computers, notebook PCs, PDAs and cellular phones has grown rapidly. All of these devices use batteries as the source of power. Due to their limitations of small size and light weight and due to increasingly stringent environmental requirements in product development, the use of small numbers, small size, long-lasting batteries has become a trend. The AIC1630/1631/1633 are very suitable for the application of using 2~4 batteries. This article will focus on the application of AIC1631-5 for 2 batteries in the following description. A set of two alkaline, NiMH, or NiCd battery cells accompanied by a switching converter with 3V, 3.3V, or 5V output voltage is frequently used as the power supply source for portable electronic products. Using two battery cells is usually a result of compromise between size and battery operating life. Besides the batteries’ own stored energy, two other factors also influence batteries’ operating life: the product’s power consumption and conversion efficiency of the converter. In order to choose the appropriate switching converter for an electronic product, therefore, 5 key factors need to be considered: (1) The current capacity and regulation of the output should meet the product’s demands. (2) High conversion efficiency. (3) Low power consumption. (4) Squeeze out as much of the battery energy as possible. (5) Small size and light weight. The first factor is absolutely necessary, and the importance of the other four differs in priority depending on the character of the product. For products, which operate relatively high current for extended time periods, conversion efficiency is paramount. For products operate with low current for most of the time, the current consumption of the converter itself must also be low. With regards to size and weight, an 8-pin IC, which does not need a heatsink, with a small inductor, and minimum number of external parts, would be an ideal choice. In the following, we use the AIC1631 DC/DC converter as an example for several different special products using two battery cells to demonstrate how the AIC1631 can be used to make an ideal power source. (+5V) +VOUT +VIN 1N5819 CGND LBO LBI VOUT SGND SW VIN ILIM/SD + 100 µF C3 D1 47 µH* *Sumida RCH-108 + 100 µF C1 + 1K R1 33K R2 10 µF C2 VIN AIC1631-5 Fig. 1 A High-Efficiency 2-Cell to 5V Converter |
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