High Integration, High Efficiency Power Solution for TMS32C2834x MCU

The bq2403x Battery Charger and Dynamic Power Path Management (DPPM) IC is a highly integrated IC which minimizes the required wall adapter size by reducing the battery charging current during peak current demands by the system. Typically a 5-hour charge timer is used to limit the charge time on the battery as a safety feature. Because the charging current can be reduced at any time for any duration, the timer could expire before the battery fully charges and enter a fault mode. A special feature was added to slow the clock frequency of the timer by the amount proportional to the reduction in charge current, except when the reduction is due to voltage regulation, thus extending the safety timer as needed to finish the charge. Of the two main ways to reduce the charge current and slow the timer, the most common way is to enter DPPM mode due to a limited source current; the second, less common way is going into thermal regulation.