When you use the tech products, you will always face the problem to charge the items. For example, when you choose to use the car adapter, this is a process you can not avoid. However, the process of charging is somewhat dangerous. You should pay much attention on the matter. And you have to design a right way to solve the problem.

Taking into account the dangerous factors in front of the system, you can develop an appropriate charge management system to ensure the right process to charge the adapter. I believe you will have the sense to be safe. When the input source voltage is good, you can use linear charging solutions. Microchip’s MCP738xx linear battery charger series is a linear charging solution examples. In these applications, the linear solution provides many advantages such as easy to use, small size and low cost.

If the range of input voltage is wide, for example, you have used the non-regulated AC-DC wall adapter or car adapter, you should switch regulator battery charger to reduce within a reasonable level of power loss. This is the prior way you should follow when you charge your adapter.

Switching regulator topology determines the switching regulator and passive filter components of the composition. This constitutes a difference with the choice of topology changes, and thus to the complexity, efficiency, noise and the trade-off between output voltage range. Power converter topologies vary. But only a few are suitable for battery chargers at the range from 5W to 50W.

Buck regulator is a topology commonly used for battery charging application. Buck regulator has the following advantages and disadvantages: Firstly, it has low complexity and single-inductor structure. Then, the conversion efficiency can reach up to 90%. It can suitable for the synchronous applications for the adapter.

However, the disadvantages of this system are a lot. Integrated buck regulator diode in the MOSFET switch the input voltage will not constitute a battery discharge path for the car adapter. Requiring an additional blocking diode, additional devices also cause the system to be additional pressure drop.

Buck regulator input current is pulsed, or intermittent. In this topology produces a high power input electromagnetic interference. Most regulators have a need for additional input EMI filter. The third disadvantage is that step-down regulator can only compare the input voltage and low output voltage regulator. Some applications of the input voltage range cover the required output voltage range. For the multi-cell lithium ion battery cells charge the battery pack consisting of the application, this is very common. This is the general disadvantages for the charging of the adapter. Anyhow, when you use the item, you should be careful on any aspect.