When I choose a product, we always need to choose based on external factors. The same is true for integrated chip inductors. We need to consider the factors and then choose the appropriate integrated chip inductors, shielded chip inductors, and chip power inductors. There are many factors that affect chip inductance. Let's talk about the reasons why we need to choose chip inductance.

     Choosing chip inductors for portable power applications requires consideration of the three most important points: the size of the scale, and the third is the size of the scale. The circuit board area of mobile phones is very scarce and precious, especially when various functions such as MP3 players, TV and video are added to the phone. Function addition will also increase the current consumption of the battery. Therefore, modules that have previously been powered by linear regulators or directly connected to batteries require higher power solutions. The first step to complete a higher power solution is to select a magnetic buck converter.

     In addition to the size of the inductance, the primary criteria for inductance include the inductance value at the switching frequency, the DC impedance of the coil, the additional saturation current, the additional RMS current, the communication impedance ESR and the factor. Depending on the application, it is also important to choose between shielded and unshielded inductance types.

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      Similar to the DC bias in the capacitor, manufacturer A’s 2.2μH inductor may be completely different from manufacturer B’s. The relationship between the inductance value and the DC current of the chip inductor in the relevant temperature range is a very important curve, which must be consulted by the manufacturer. On this curve, the additional saturation current (ISAT) ISAT is generally defined as the inductance drop The amount is the DC current at 30[[%]] of the additional value. Some inductor manufacturers do not have rules for ISAT. They may give a direct current when the temperature is 40°C higher than the ambient temperature.

      When the switching frequency exceeds 2MHz, it is necessary to pay special attention to the communication loss of the inductor. The ISAT and DCR of the inductors of different manufacturers listed in the standard specification may have very different communication impedances at the switching frequency, resulting in significant power under light load. difference. This is very important to improve the battery life of portable power systems, because most of the time the system is in sleep, standby or low power mode.

As chip inductor manufacturers rarely provide ESR and Q factor information, designers should take the initiative to ask them. The relationship between the inductance and the current given by the manufacturer is often limited to 25°C, so the relevant data within the operating temperature range should be consulted. The worst case is generally 85°C.