USB Single Cell Charger

Description: Lithium Polymer Batteries are a very common source of power today. Many electronics gadgets have one inside, and they have some reasonable features. I've bought great batteries, with different sizes and capacities for my electronics projects. So long I'm using this batteries, coming the problem: charge them. More: So, we start to find the correct circuit for my DIY charger. After some Google research I found the Maxim MAX1811 IC. It's a single-cell Lithium battery charger that can be powered directly from a USB or from an external supply up to 6.5V. It's use a SO-8 Package, easy to solder and can be sampled at Maxim. Other chip features are:

You can select between 4.1V and 4.2V battery regulation point;

You can select between 100mA and 500mA current drain from USB.

The Maxim MAX1811 is a highly efficient integrated circuit designed specifically for charging single-cell Lithium Polymer (LiPo) batteries. This IC is particularly beneficial for portable electronic devices due to its ability to operate directly from a USB power source or an external supply voltage ranging from 4.5V to 6.5V. The MAX1811 is housed in a compact SO-8 package, facilitating easy integration into various electronic designs.

The primary function of the MAX1811 is to manage the charging process of LiPo batteries, which requires precise voltage and current control to ensure safety and longevity of the battery. The IC allows for the selection of two battery regulation voltages: 4.1V and 4.2V. This feature is crucial as it accommodates different battery chemistries and specifications, providing flexibility for designers.

Additionally, the MAX1811 offers a choice between two charging currents, 100mA and 500mA. This selection can be made depending on the application’s power requirements and the desired charging speed. The ability to adjust the charging current is particularly useful in scenarios where the USB power supply may be limited or where faster charging is necessary.

The design of the charger circuit using the MAX1811 typically includes several external components such as input and output capacitors, a sense resistor for current measurement, and a few passive components to support the operation of the IC. The overall circuit design ensures that the charging process is efficient, minimizes heat generation, and adheres to the safety standards required for LiPo battery charging.

In summary, the MAX1811 is an excellent choice for DIY projects involving Lithium Polymer batteries, providing essential features for safe and efficient charging while being easy to implement in various electronic designs.Lithium Polymer Batteries are a very common source of power today. Many electronics gadgets have one inside, and they have some reasonable features. I've bought great batteries, with different sizes and capacities for my electronics projects. So long I'm using this batteries, coming the problem: charge them. So, we start to find the correct circuit for my DIY charger. After some Google research I found the Maxim MAX1811 IC. It's a single-cell Lithium battery charger that can be powered directly from a USB or from an external supply up to 6.5V. It's use a SO-8 Package, easy to solder and can be sampled at Maxim. Other chip features are: You can select between 4.1V and 4.2V battery regulation point; ? You can select between 100mA and 500mA current drain from USB.