ZHCSGY5A October 2017 – December 2017
While in DPPM mode, if the charging current falls to zero and the system load current increases beyond the programmed input current limit, the voltage at OUT reduces further. When the OUT voltage drops below the VBSUP1 threshold, the battery supplements the system load. The battery stops supplementing the system load when the voltage at OUT rises above the VBSUP2 threshold.
During supplement mode, the battery supplement current is not regulated (BAT-FET is fully on), however there is a short circuit protection circuit built in. Figure 31 demonstrates supplement mode. If during battery supplement mode, the voltage at OUT drops VO(SC2) below the BAT voltage, the OUT output is turned off if the overload exists after tDGL(SC2). The short circuit recovery timer then starts counting. After tREC(SC2), OUT turns on and attempts to restart. If the short circuit remains, OUT is turned off and the counter restarts. Battery termination is disabled while in supplement mode.