MP2796 Battery Monitor and Protection Systems

MPS’ MP2796 robust battery management devices provide a complete analog front-end (AFE) monitoring and protection solution. They are designed for multiple-cell series battery management systems (BMS). These devices can support digital interface or SPI communication. They support connections for 7-cell to 16-cell series battery packs, with an absolute voltage exceeding 80 V on particular pins.

The MP2796 integrates two separate analog-to-digital converters (ADCs). The first ADC measures each channel’s differential cell voltages (up to 16 channels), die temperature, and 4-channel temperatures via external NTC thermistors. The second ADC measures the charge/discharge current via an external current-sense resistor. When paired with an MPF4279x fuel gauge, the MP2796 can achieve a state-of-charge (SOC) error to within 2%. The MP2796 includes high-side MOSFET (HS-FET) drivers for charge and discharge control.

The discharge (DSG) MOSFET driver includes a configurable soft-start (SS) that provides a controlled turn-on, eliminating the need for an external pre-charge circuit. The MOSFET drivers also incorporate overcurrent protection (OCP), short-circuit protection (SCP), battery undervoltage protection (UVP), battery overvoltage protection (OVP), and high-/low-temperature protection. All of these protections have configurable thresholds.

Internal passive balancing MOSFETs can be used to equalize mismatched cells, supporting up to 58 mA. There is also the option to drive external balancing transistors (MOSFET or BJT).

The EV2796-0000-FP-00A and EV2796-0002-FP-00A evaluation boards are designed to demonstrate the capabilities of the MP2796. These evaluation boards combine the MP2796 with power MOSFETs and a current-sense resistor to support up to 70 A of charge/discharge current. If needed, the EV2796-0000-00A and EV2796-0002-FP-00A include placeholders to add external MOSFETs for a higher balancing current.

The EV2796-0000-00A works with the MP2796DFP-0000 and supports I²C communication, while the EV2796-0002-FP-00A works with the MP2796DFP-0002 and supports SPI communication.