The VINDPM loop prevents the input voltage from collapsing to a point where charging would be interrupted. This is done by reducing the current drawn by charger enough to keep the input voltage above the VINDPM threshold (V_INDPM).

During the normal charging process, if the input power source is not able to support the programmed or default charging current and System load, the supply voltage decreases. Once the supply drops to the V_INDPM threhold, the input DPM current and voltage loops will reduce the input current through the blocking FETs to prevent the further drop of the supply.

The VINDPM threshold is typically 300 mV above VBAT. If the device is not operating in battery tracking VINDPM due to battery voltage, it will regulate the input to 3.6 V. Additionally, termination is disabled when VINDPM is active.