MP2639A 2-Cell Li-Ion or Li-Polymer Switching Charger Compatible with 5V Input and Integrated, Bidirectional Charge/Discharge with Cell Balance The Future of Analog IC Technology DESCRIPTION FEATURES The MP2639A is a highly integrated, flexible, 4.0V to 5.75V Input Voltage Range switch-mode, battery-charging management Charge 2-Cell Batteries with 5V Input device for 2-cell series Li-ion and Li-polymer USB-Compliant Charger batteries used in a wide range of portable Integrates Input Current-Based and Input applications. Voltage-Based Power Management Functions The MP2639A is able to charge a 2-cell battery Programmable Input Current and Input from a 5V adapter or USB input. The MP2639A Voltage Limit can work in three modes: charge mode, Up to 2.5A Programmable Charge Current discharge mode, and sleep mode. for 2-Cell Applications In 2-cell applications, the 5V input charges the 8.4V Charge Voltage with 0.5% Accuracy 2-cell battery via the MP2639A operating in Cell Balance with 200mA current step-up mode. When the 5V input is absent, the Up to 5.0A Programmable Discharge 2-cell battery voltage is discharged to the 5V Current output via the MP2639A working in step-down Negative Temperature Coefficient Pin for mode. Temperature Monitoring For the charging function, the MP2639A detects No Load Shutdown and Push Button Turn- the battery voltage automatically and charges On in Discharge Mode the battery in three phases: trickle current, Programmable Timer Back-Up Protection constant current, and constant voltage. Other Discharge Mode Load Trace Compensation features include charge termination and auto- Thermal Regulation and Thermal Shutdown recharge. Internal Battery Reverse Leakage Blocking To guarantee safe operation, the MP2639A Integrated Short-Circuit Protection (SCP) for limits the die temperature to a preset value of Both Charge and Discharge Mode 120C. Other safety features include input over- Four LED Battery Level and Status voltage protection (OVP), battery over-voltage Indicators protection (OVP), thermal shutdown, battery Available in a QFN-26 (4mmx4mm) temperature monitoring, and a programmable Package timer to prevent prolonged charging of a dead APPLICATIONS battery. Power Station Applications The MP2639A is available in a QFN-26 Power Bank Applications for Smart Phones, (4mmx4mm) package. Tablets, and Other Portable Devices Mobile Internet Devices All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. MPS and The Future of Analog IC Technology are registered trademarks of Monolithic Power Systems, Inc. MP2639A Rev. 1.01 www.MonolithicPower.com 1 12/23/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2019 MPS. All Rights Reserved. MP2639A SWITCH-MODE BATTERY CHARGER W/ BIDIRECTIONAL OPERATION TYPICAL APPLICATION 2-Cell Application Charge Mode VL R2 R1 L1 FB BST SW LX Q RB Q1 5V Input VH V BATT VL C VH Q2 MID R3 C VL Battery ACOK MID NTC VLIM VNTC VCC MP2639A PB OLIM MODE IB ILIM LED1 ISET LED2 TMR LED3 LED4 C R R R C R4 TMR ISET ILIM OLIM VCC CHGOK AGND PGND 2-Cell Application Discharge Mode R2 R1 L1 L FB BST SW Q RB Q1 X 5V Output VH V BATT VL C V Q2 H MID R3 C VL Battery ACOK VLI MID NTC M VNTC VCC MP2639A PB OLI MOD M E IB ILIM LED 1 ISET LED 2 LED TMR 3 LED 4 C R R R C R4 TMR ISET IILIM OLIM VCC CHGOK AGND PGND Adapter BATT Active MODE CHG/DSG Topology Term Term SW High DSG Q1 Step-down VL VH Low CHG Q2 Step-up MP2639A Rev. 1.01 www.MonolithicPower.com 2 12/23/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2019 MPS. All Rights Reserved.