ZHCSPC2C September 2021 – January 2023 BQ25180
PRODUCTION DATA
The VINDPM loop prevents the input voltage from collapsing to a point where charging could be interrupted due to adapter voltage crashing below VINDPM value. This is done by reducing the current drawn by the charger enough to keep VIN > VINDPM setting.
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 VINDPM, the input DPM current and voltage loops will reduce the input current through the blocking FETs Q1 and Q2 to prevent the further drop of the supply. The VINDPM threshold is programmable through the I2C register and can be completely disabled. This is set through the VINDPM_0 and VINDPM_1 selection bits. When the device enters this mode, the charge current may be lower than the set value and the VINDPM_ACTIVE_STAT bit is set. If the 2x timer is set through the 2XTMR_EN bit, the safety timer is extended while VINDPM is active. Additionally, termination is disabled when VINDPM is active.