SDAA092 October   2025 BQ25822

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2BQ25822 Overview
  6. 3Implementing High-Power Supercapacitor Backup Design with BQ25822
  7. 4BQ25822 Evaluation
    1. 4.1 Equipment
    2. 4.2 BQ25822 EVM Setup
    3. 4.3 Evaluation and Results
  8. 5Summary
  9. 6References

4.3 Evaluation and Results

Forward to Reverse Mode Transition Recovery
When ACUV is pulled low, the BQ25822 transitions into reverse supplement mode within 150µs
Figure 4-1 Forward to Reverse Mode Transition Recovery
Forward to Reverse Mode Transition Time
When ACUV is pulled high, the BQ25822 transitions into forward charging mode within 150µs
Figure 4-3 Forward to Reverse Mode Transition Time
Forward Mode Current Control
Adjusting PWM signal on ILIM_HIZ pin, allows the BQ25822 to step up or down the charging current in forward mode.
Figure 4-5 Forward Mode Current Control
Forward to Reverse Mode Transition Recovery
The BQ25822 delivers 20A of charging current (10A per EVM), then transitions to 10A of supplement current (5A per EVM).
Figure 4-2 Forward to Reverse Mode Transition Recovery
Forward to Reverse Mode Transition Recovery
The BQ25822 delivers 10A of supplement current (5A per EVM), then transitions to 20A of charging current (10A per EVM).
Figure 4-4 Forward to Reverse Mode Transition Recovery
Reverse Mode Current Control
Adjusting PWM signal on ILIM_HIZ pin, allows the BQ25822 to step up or down the supplement current in reverse mode.
Figure 4-6 Reverse Mode Current Control
Forward Mode Efficiency (9s Battery Configuration)

VBAT = 36V

Figure 4-7 Forward Mode Efficiency (9s Battery Configuration)
Reverse Mode Efficiency (9s Battery Configuration)

VBAT = 38V

Figure 4-8 Reverse Mode Efficiency (9s Battery Configuration)