BQ2000PWG4

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The BQ2000PWG4 from Texas Instruments is a highly integrated and flexible switching charger for multiple battery chemistries. This device can be readily combined with accessory power-on reset, battery monitoring, and diagnostic circuitry to provide an optimal solution for diverse battery-powered systems. It is suitable for charging single-cell Li-Ion and Li-Polymer batteries as well as up to four parallel connected cells. With features like a 3.2 A maximum charging current and 6.5 kHz operating frequency, the BQ2000PWG4 is well suited for a variety of applications.

The BQ2000PWG4 application field mainly consists of mobile phones, tablet computers and other portable electronic devices. It supports the charging of Lithium-Ion (Li-Ion) and Lithium-Polymer (Li-Poly) batteries. It also supports charging multiple batteries in parallel up to 4 cells maximum. Its main function is to act as a power source for battery charging and act as an interface between batteries and the host system.

The BQ2000PWG4 also include several safety and protection features such as over temperature protection, over current protection and charger timer circuit. Also, its unique input power-path management (IPPM) technique provides a safe, transparent and efficient power delivery path for mobile device charging and the operation of ICs. Furthermore, it has low external component count for reduced overall BOM cost and higher system efficiency.

The BQ2000PWG4 works on a principle of controlling the current and voltage of the charging system. The device is initiated by setting the charging parameters which it uses to maintain desired system performance of the charge-cycle. After that, a voltage and current sensing system is used to monitor the voltage of the load. Based on the readings of these sensors, the device activates the external FETs which are connected to control the current flow of the charger. The FETs provide a controlled level of current and voltage to charge the battery safely and quickly in order to avoid any thermal runaway situations.

The current and voltage settings are obtained from the user by applying various charging profiles. Different profiles can be customized to maximize the battery life depending on the battery type and application. Furthermore, the unique input power-path management (IPPM) technique helps to reduce the total standby power consumption of the device and provides efficiencies up to 94%. This makes the BQ2000PWG4 an attractive choice for mobile devices and other battery-powered applications.

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