ZHCSNF1 February 2021 BQ25960
PRODUCTION DATA
For higher power systems, it is possible to use two devices in dual charger configuration. This allows each device to operate at lower charging current with higher efficiency compared with single device operating at the same total charging current. The CDRVL_ADDRMS pin is used to configure the functionality of the device as Standalone, Primary or Secondary during POR. Refer to Section 9.3.13 for proper setting. When configured as a primary, the TSBAT_SYNCOUT pin functions as SYNCOUT, and the SRN_SYNCIN pin functions as SRN. When configured as a Secondary, the TSBAT_SYNCOUT pin functions as TSBAT, and the SRN_SYNCIN pin functions as SYNCIN. ACDRV1 and ACDRV2 are controlled by the primary, and ACDRV1 and ACDRV2 on the secondary should be grounded. Pull the SYNCIN/SYNCOUT pins to REGN on the primary BQ25960 through a 1-kΩ resistor. The maximum switching frequency in primary and secondary mode is 500 kHz.
The dual charger can operate in Primary and Secondary Mode in Bypass Mode as well. In both Bypass and Switched Cap Mode, the current distribution between the two devices depends on loop impedance and the chargers do not balance it. In order balance the current, the board layout needs to be as symmetrical as possible.