BQ25882 datasheet(21/86 Pages) TI2

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5.4

BAT (V)

6.2

6.6

7.0

7.4

7.8

8.2

8.6

9.0

Charge Disabled

Charge Enabled

Minimum System Voltage

5.8

6.2

6.6

7.0

7.4

7.8

8.2

8.6

BQ25883

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SLUSDL3A – FEBRUARY 2019 – REVISED APRIL 2019

Product Folder Links: BQ25883

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Figure 16. System Voltage vs. Battery Voltage

8.3.6.2 Dynamic Power Management

To meet the maximum current limit in the USB spec and avoid over loading the adapter, the device features

Dynamic Power Management (DPM), which continuously monitors the input current and input voltage. When

input source is over-loaded, either the current exceeds the input current limit (IINDPM or ICO_ILIM or ILIM pin

setting) 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 the Supplement

Mode where the BATFET turns on and battery starts discharging so that the system is supported from both the

input source and battery.

During DPM mode, the status register bits VINDPM_STAT (VINDPM) and/or IINDPM_STAT (IINDPM) go high.

The figure shows the DPM response with 5V/3A adapter, 6.4V battery, 1.5A charge current and 6.8V minimum

system voltage setting.

BQ25882 Datasheet(PDF) 21 Page - Texas Instruments