MP2643 2A Bidirectional Active Balancer QFN-26

MP2643 2A Bidirectional Active Balancer QFN-26

The MP2643 is a highly integrated, bidirectional active balancer that provides up to 2A of charge redistribution among Li-ion, Li-polymer, or lithium iron phosphate batteries in a two-series battery pack.

Key Specifications

Features

• Wide Operating Voltage Range Compatible with LiFePO4 Batteries: o 2.4V Minimum Cell Voltage o 4.35V Maximum Cell Voltage
• Low Quiescent Current (IQ): o CU Pin: 12μA IQ o CL Pin: 0.1μA IQ
• Buck-Balance Mode: o Net Transfer Current to Lower Cell o Configurable between 0.5A and 2A
• Boost-Balance Mode: o Net Transfer Current to Upper Cell o Configurable between 0.5A and 2A
• Protections: o Thermal Shutdown o Internal CL Port Battery Reverse Leakage Blocking o Integrated CU Low Voltage Protection in Boost-Balance Mode
• Directly Powered from the Battery Cells
• Interleavable for Transfer across Many Cells
• Available in a QFN-26 (4mmx4mm) Package

Typical Application Circuit

Applications

• Grid-Level Energy Storage Systems (ESS)
• Residential ESS
• Battery Backup Systems

Design Notes

• Cell measurement accuracy is specified over temperature — calibrate the sense path if the gauge reports state of charge rather than raw voltage.
• Balance current is limited by the bleed resistor and the pack wiring; check the resulting balance time for the capacity mismatch you expect.
• Protection thresholds should sit inside the cell maker's absolute limits with margin for measurement error.
• Keep the sense lines separate from the power path to avoid IR drop corrupting readings.

Common Questions