The LT3650 supports a low-current based termination scheme, where a battery charge cycle terminates when the current output from the charger falls to below one tenth the maximum current, as programmed with RSENSE.
The C/10 threshold current corresponds to 10mV across RSENSE.
This termination mode is engaged by shorting the TIMER pin to ground.
When C/10 termination is used, an LT3650 charger sources battery charge current as long as the average current level remains above the C/10 threshold.
When VBAT drops below 97.5% of the full-charged float voltage, whether by battery loading or replacement of the battery, the charger automatically re-engages and starts charging.