The device uses the termination comparator to transition from absorb charge to float charge when charging a lead-acid battery. The threshold is reached when the battery voltage is in absorb phase regulation, and the current is below termination current. The termination current threshold is controlled by the lower option between the 10% of ICHG pin setting or the ITERM register setting.

In standalone applications using the ICHG pin to program the current, the termination threshold is set at 10% of the ICHG pin value (10A ICHG pin programming results in 1A termination). The termination is detected when the ICHG pin voltage drops below V_{REF_ITERM}.

In host-controlled applications, the termination current can be programmed using the ITERM register bits. The ICHG pin can still be used to set a hardware limit for the charge current.

When termination occurs, the device reduces battery voltage to float charge regulation, the status register CHRG_STAT is set to 101, and an INT pulse is asserted to the host. Termination is temporarily disabled when the charger device is in input current, or input voltage regulation. Termination can be permanently disabled by writing 0 to EN_TERM prior to charge termination. In this case, the device can still exit the absorb phase voltage when the CV timer expires. Refer to Section 7.3.4.4 for more details.

At low termination currents, due to the comparator offset, the actual termination current may be significantly than the termination target. In order to compensate for comparator offset, a programmable top-off timer (default disabled) can be applied after termination is detected. The top-off timer will follow safety timer constraints, such that if safety timer is suspended, so will the top-off timer. Similarly, if safety timer is doubled, so will the top-off timer. CHRG_STAT reports whether the top off timer is active via the 110 code. Once the Top-Off timer expires, the CHRG_STAT register is set to 111 and an INT pulse is asserted to the host. Note that if CV timer expires while device is in Top-Off timer mode, the device will immediately transition from absorb charge voltage to float charge voltage.