Pre-Term is used to program both the pre-charge current and the termination current threshold. The pre-charge current level is a factor of two higher than the termination current level. The termination can be set between 5 and 50% of the programmed output current level set by ISET. If left floating the termination and pre-charge are set internally at 10/20% respectively. The pre-charge-to-fast-charge, V_lowv threshold is set to 2.5V.

where

• %Term is the percent of fast charge current where termination occurs;
• %Pre-CHG is the percent of fast charge current that is desired during precharge;
• K_TERM and K_PRE-CHG are gain factors found in the electrical specifications.