MP2631DQ-LF-Z

MP2631 28V, 1A, Li-lon, Linear Battery Charger with 10mA High Voltage LDO The Future of Analog IC Technology DESCRIPTION FEATURES The MP2631 is a linear, high performance single cell Li-Ion or Li-Polymer battery charger with 10mA LDO. By integrating high voltage input protection into the charger IC, the MP2631 can tolerate an input surge up to 28V. The internal 5V LDO can be used as a system watchdog supply to monitor charge status. The LDO is ON when the input voltage is greater than 3V and less than 7V, and remains ON when the MP2631 is in SHDN mode. When input is higher than 7.0V, the LDO output will be cut off from the input. When input is lower than 5V, the LDO will work in the dropout region. The device features constant current (CC) and constant voltage (CV) charging modes with programmable charge current (200mA to 1A), auto-recharge and trickle charge. MP2631 provides ACOK and charge status indications to the system. The OVP circuitry will automatically disconnect both charger and LDO from input when VIN exceeds 7V. For guaranteed safe operation, the MP2631 limits the die temperature to a preset value when the device is heated up due to limited PCB space. MP2631 is available in 10-pin 3mm x 3mm QFN package. • Complete Solution for Charging Single-Cell Li-Ion Battery Input Surge Protection Up to 28V 5V LDO output 3V to 7V Input Operating Range Programmable Charge Current: 200mA to 1A Termination and auto-recharge 0.75% VBATT Accuracy over Temperature CC-> CV) Figure 2 below shows the typical charging profile for the MP2631. It begins charging at the constant current of the programmed value (ICHG). This is referred to as Constant Current (CC) mode. For a deeply discharged battery, it will start trickle at 10% of the programmed charge current until battery voltage reaches 2.6V. Once the battery voltage reaches 4.2V, the charger will operate in the constant voltage (CV) charge mode. The charge current drops during CV mode, and the battery full indication is set when the charge current reduces to the battery full value (IBF) at 10% of the nominal charge current. OPERATION Input Voltage Range The MP2631 has built-in input voltage surge protection as high as +28V. The charger IC will be automatically disabled when the input voltage is lower than 2.1V or higher than 7.0V. For MP2631, the open-drain pin ACOK is used to indicate an input power good condition (i.e. 3.5V