MP2651

The MP2651 is a buck-boost charger IC designed for battery pack applications with 1 cell to 4 cells in series. It can accept a wide 4V to 22V input voltage (V_IN) range to charge the battery. The buck-boost topology allows the battery voltage to be above or below V_IN. The MP2651 can supply a wide 3V to 21V V_IN range while source mode is enabled. In source mode, the device has an output current limit (I_{OUT_LIMIT}) with a high resolution.

If the input is present, the MP2651 operates in charge mode. It measures the battery voltage and charges the battery with four phases: constant-current trickle charge, constant-current pre-charge, constant-current fast charge, and constant-voltage charge. Other features include charge termination and automatic recharge. The integrated input current limit (I_{IN_LIMIT}) and V_IN limit (V_{IN_LIMIT}) avoid overloading the input power source. This feature is compliant with USB and PD specifications.

The MP2651 can flexibly configure the charge and discharge parameters via the I²C/SMBus interface, such as I_{IN_LIMIT}, V_{IN_LIMIT}, the charge current, battery full-regulation voltage, output voltage (V_OUT), and the output current (I_OUT) in source mode. It can also provide the operating and faults statuses via the I²C registers.

To guarantee safe operation, the MP2651 limits the die temperature to a configurable threshold. Other safety features include input over-voltage protection (OVP), battery OVP, CFLR OVP, thermal shutdown, and a configurable timer to prevent prolonged charging of a dead battery. The MP2651 is available in TQFN-30 (4mmx5mm) package.