The MP2761 is a buck-boost charger IC designed for battery packs with 2-cell to 4-cell in series. The device 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.

When the input is present, the MP2761 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. Additional features include charge termination and auto-recharge.

The MP2761 also integrates the input current (I_IN) limit and V_IN limit to avoid overloading the input power source. This is compliant with the USB and power delivery (PD) specifications.

The MP2761 provides narrow-voltage DC (NVDC) power path management. An integrated N-channel MOSFET driver (BGATE) controls an external N-channel MOSFET (BATFET) to regulate the system’s minimum voltage and provide a battery supplement function. The device can supply a wide voltage range (4V to 21V) at the IN pin when source mode is enabled. The device also has an IN output current limit in source mode (I_{IN_SRC}) with high resolution. These are compliant with USB PD specifications.

The I²C/SMBus interface can configure the charge and discharge parameters, including the I_IN limit, V_IN limit, charge current, battery-full regulation voltage, IN output voltage in source mode (V_{IN_SRC}), and I_{IN_SRC}. The MP2761 can also provide information on statuses and faults through the I²C/SMBus registers.

To guarantee safe operation, the device limits the die temperature to a configurable threshold. Other safety features include input over-voltage protection (OVP), battery OVP, system OVP, thermal shutdown, and a configurable timer to prevent prolonged charging of a dead battery.

The MP2761 is available in a TQFN-30 (4mmx5mm) package.