MP2681B

The MP2681B is a highly integrated Li-ion or Li-polymer switch-mode battery-charge controller with full protection and status indication. This part integrates a precision voltage reference and charge status indications suitable for AC adapter input and cradle charger applications. The MP2681B detects automatically the battery cell through a battery ID resistor and regulates the battery voltage according to the corresponding cell configurations: 3S, 4S, and 5S. Then, the AC adapter output is regulated automatically according to the chosen battery configuration. Additionally, if the battery pack does not have an ID resistor, the charge termination voltage can be configured by setting a dedicated voltage to the ID pin, according to the pre-set VID values representing the battery configuration. The MP2681B charges the battery in three phases: pre-charge, constant current and constant voltage. Charge is terminated when the current reaches a minimum set level. An internal charge timer provides safety back-up. The MP2681B provides a fixed pre-charge mode for deeply-discharged batteries and safety features that include battery temperature monitoring, NTC control, charge time-out, and fault control. MP2681B is available in a 16-pin SOIC package.