SDAA092 October 2025 BQ25822
In high-power systems, fast transient load conditions can impose instantaneous and high current demands that can exceed the dynamic response capability of the main power supply. In many cases, the supply is not designed to deliver the full peak power or respond quickly enough to satisfy transient requirements. Therefore, maintaining a relatively constant input profile under varying load conditions is essential.
The BQ25822, when used in combination with a localized storage element such as a supercapacitor, provides an effective design to these challenges. This approach enables rapid transient response and reliable peak-power delivery while reducing stress on the main supply. This is achieved by discharging the local energy storage during peak-power events, charging during light-load conditions, and dynamically adjusting the charging current when the load is moderate to maximize overall efficiency