SLUSEK7 September 2024 BQ25773
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
Usually adapter can supply current higher than DC rating for a few milliseconds to tens of milliseconds. The charger employs two-level input current limit, or peak power mode, to fully utilize the overloading capability and minimize battery discharge during CPU turbo mode. The level 1 current limit, or ILIM1, is the same as adapter DC current, set in IIN_DPM register. The level 2 overloading current, or ILIM2, is set in ILIM2_VTH, as a percentage of ILIM1.
When the charger detects input current surge and battery discharge due to load transient (both the adapter and battery support the system together), or when the charger detects the system voltage starts to drop below VSYS_MIN register setting due to load transient (only the adapter supports the system).The charger will first apply ILIM2 for TOVLD (PKPWR_TOVLD_DEG register bits), and then ILIM1 for up to TMAX – TOVLD time. TMAX is programmed in PKPWR_TMAX register bits. After TMAX, if the load is still high, another peak power cycle starts. Charging is disabled during TMAX; once TMAX, expires, charging continues. During TOVLD if PP_INOM=1b and input current exceed 110%*ILIM1, the PROCHOT pin should be pulled down after INOM_DEG deglitch time expires. The details can be found in Figure 7-9.
To prepare entering peak power follow the steps below: