MP2672A Boost Charger with Cell Balance for 2-Cell Lithium-Ion Batteries in Series DESCRIPTION FEATURES The MP2672A is a highly integrated, flexible 4.0V to 5.75V Operating Input Voltage switch-mode battery charger IC for Lithium-ion Up to 14V Sustainable Voltage batteries with two cells in series. This makes it Up to 2A Configurable Charge Current for applicable for a wide range of portable Battery with 2 Cells in Series applications. Compatible with Host-Control or Standalone Mode When an input power supply is present, the NVDC Power Path Management MP2672A operates in boost mode to charge the Configurable Input Voltage Limit battery with two cells in series. When charging is enabled, the MP2672A automatically detects the Configurable Charge Voltage with 0.5% Accuracy battery voltage and charges the battery in three phases: pre-charge, constant current charge, No External Sense Resistor Required and constant voltage charge. Other features Integrated Cell-Balancing Circuit for include charge termination and auto-recharge. Mismatched Cells Preconditioning for Fully Depleted Battery The device also has a narrow voltage DC (NVDC) Flexible New Charging Cycle Initiation power structure. With a deeply discharged Charging Operation Indicator in Standalone battery, the MP2672A regulates the system Mode output to a minimum voltage level. This powers Missing Battery Detection in Host-Control the system instantly while simultaneously Mode charging the battery via the battery FET. 2 I C Port for Flexible System Parameter The MP2672A provides a cell balance function. Setting and Status Reporting in Host- It can monitor the voltage across each cell, then Control Mode equalize the cells voltages if the difference Negative Temperature Coefficient (NTC) between the two cells exceeds the mismatch Pin for Temperature Monitoring Compliant threshold. with JEITA Standards The device has two configuration modes: Built-In Charging Protection and standalone mode and host-control mode. In Configurable Safety Timer standalone mode, the charging parameters can MOSFET Cycle-by-Cycle Over-Current be configured by hardware pins. In host-control Protection (OCP) mode, the charging parameters can be Thermal Regulation and Thermal Shutdown 2 configured by the I C registers. Available in a QFN-18 (2mmx3mm) Package Diverse and robust protections include a thermal regulation loop to decrease the charge current in APPLICATIONS case the junction temperature exceeds the Portable Handheld Solutions thermal loop threshold, and battery temperature Point-of-Sale (POS) Machines protection that is compliant with JEITA standards. Bluetooth Speakers Other safety features include input over-voltage E-Cigarettes protection (OVP), battery OVP, thermal shutdown, battery temperature monitoring, a General 2-Cell Applications watchdog timer, and a configurable backup timer All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. to prevent prolonged charging of a dead battery. For MPS green status, please visit the MPS website under Quality Assurance. MPS, the MPS logo, and Simple, Easy Solutions are The MP2672A is available in a QFN-18 trademarks of Monolithic Power Systems, Inc. or its subsidiaries. (2mmx3mm) package. MP2672A Rev. 1.0 www.MonolithicPower.com 1 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2020 MPS. All Rights Reserved. MP2672A 2-CELL LI-ION OR LI-POLYMER BOOST SWITCHING CHARGER TYPICAL APPLICATIONS Standalone Mode Use a resistor to connect the CV pin to AGND. Set the battery-full voltage according to Table 1. Table 1: Battery Voltage Settings R Range V VBATT BATT REG 30k to 35k 8.4V 70k to 75k 8.6V 100k to 105k 8.7V 130k to 135k 8.8V SYS BST Q3 Q2 BATT L1 VIN SW Q1 C BATT IN C IN R H VLIM MID R MP2672A L ACOK VCC STAT VCC R T1 AGND CV NTC ISET R T2 R VBATT R ISET PGND R NTC Figure 1: Typical Application in Standalone Mode MP2672A Rev. 1.0 www.MonolithicPower.com 2 11/10/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2020 MPS. All Rights Reserved.