Design requirements for polymer lithium battery power supply system

How does the load balancing design of the polymer lithium battery charging system provide lithium-ion charging management solutions in a very short time, while meeting the space and cost requirements? Lithium-ion polymer batteries are widely used in today's portable consumer electronic products. The ordinary lithium polymer battery is a lithium ion polymer battery, which uses a solid polymer film and uses the same charging algorithm as a lithium battery. As portable electronic devices become more powerful and display screens become larger and larger, the use of lithium-ion polymer batteries is changing. With the increase in the number of battery charges per day, it becomes very important to operate the device while the battery is charging. The traditional way to design polymer lithium battery power system is to connect the system load directly to the battery. The system load will cause the lithium battery to continue to discharge and consume the battery life cycle. In order to maximize the service life of the lithium battery, it is recommended to properly terminate the charging when the input power is available and the system is powered by the input power. In order to prevent overcharging of lithium batteries, a continuity timer is usually used as an auxiliary method to shut down battery charging activities until appropriate termination conditions are met. Constant voltage phase minimum current detection is a typical termination method for lithium batteries. If the system continues to consume the current of the lithium battery, the minimum current cannot normally terminate the charging management system. It can be turned on and off periodically, or it can cause errors due to timer failure. MCP73871 is designed to overcome these design challenges for lithium battery applications. MCP73871 is a small, feature-rich single-chip solution. This device is ideal for designing small systems, and it also prolongs system life and battery life. The MCP73871 device is a fully integrated linear solution for system load balancing and lithium polymer battery charging management, with an ac/dc wall adapter or USB port power option. In addition, it can also select autonomous power supply between input power and battery. The device is not only small in size, but also requires few external components, so it is very suitable for portable applications. The MCP73871 device can automatically obtain power to the system load from a set of ion batteries or an input power source (ac/dc wall adapter or USB port). The MCP73871 device fully complies with the current consumption limits specified in the USB specification. When the ac/dcwalladapter is used to supply power to the system, the external resistor will set the charging current to the maximum value of 1A, while supporting the total current of the system load and the battery charging current to 1.8a. MCP73871 adopts constant current and constant voltage (CC/CV) charging algorithm, and the charging end point is optional. 4 fixed and constant voltage stable options: 4.10v, 4.20v, 4.35v or 440V to meet emerging battery charging needs. The MCP73871 device can also limit the charging current based on the bare chip temperature under high power consumption or high ambient temperature conditions. This thermal adjustment optimizes the charging cycle while maintaining the reliability of the device. The MCP73871 device includes a low battery indicator, a normal battery indicator, and two charging status indicators, which can be displayed by LEDs or communicate with the master MCU. The MCP73871 device supports an ambient temperature range from -40°C to +85°C. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: Market trends of four important parts and materials of lithium batteries