SLUSF18A October 2023 – December 2023 BQ25638
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
To maximize input current without overloading the adapter, the charger features Dynamic Power Management (DPM), which continuously monitors the input current and input voltage. When an input source is over-loaded, either the current exceeds the input current limit (IINDPM) or the voltage falls below the input voltage limit (VINDPM). The device then reduces the charge current until the input current falls below the input current limit and the input voltage rises above the input voltage limit.
When the charge current is reduced to zero, but the input source is still overloaded, the system voltage starts to drop. Once the system voltage falls below the battery voltage, the device automatically enters supplement mode where the BATFET turns on and the battery starts discharging to support the system from both the input source and battery.
During DPM mode, the status register bits VDPM_STAT and/or IDPM_STAT is/are set high. Figure 7-1 shows the DPM response with 9-V/1.2-A adapter, 3.2-V battery, 2.8-A charge current, and 3.4-V minimum system voltage setting.