MP2796

MP2796

7-Cell to 16-Cell High-Accuracy Battery Monitor and Protector

概要

The MP2796 is a robust battery management device, providing a complete analog front-end (AFE) monitoring and protection solution. It is designed for multiple-cell series battery management systems (BMS). This device supports I²C or SPI communication. It supports connections for 7-cell to 16-cell series battery packs, with an absolute voltage exceeding 80V 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 temperature via an external NTC thermistor. The second ADC measures the charge/discharge current via an external current-sense resistor.

The device has high-side drivers and features robust protection functions, such as over-current protection (OCP), short-circuit protection (SCP), battery under-voltage protection (UVP), battery over-voltage protection (OVP), and high/low-temperature protection. All of the protections have configurable thresholds.

The MP2796 features an internal autonomous state machine that leverages the ADC to ensure monitoring of the cell safe operating area, according to the configured thresholds. It also integrates the balancing FETs to equalize the mismatched cells with the option to drive the external balancing FETs.

It has an optimized baseline current consumption that depends on the operating mode. For applications requiring compliance with IPC 2221B or UL 60950-1, conformal coating might be required depending on the pack voltage.

The MP2796 is available in a TQFP-48 (7mmx7mm) package.

機能と利点

I²C or SPI Interface, Supports 8-Bit Cyclic Redundancy Check (CRC)
Analog Front-End (AFE) Monitor:
- Two Separate ADCs Provide Pack Voltage Strictly Synchronized with Current
- 15-Bit ADC with ≤10mV Typical Cell Measurement Error
- 16-Bit ADC with ±0.5% (Pack Current) Measurement Error at 25°C via SRP-SRN
Hardware Programmable Protections:
- Charge/Discharge Over-Current Protection (OCP)
- Charge/Discharge Short-Circuit Protection (SCP)
- Cell Under-Voltage Protection (UVP) and Over-Voltage Protection (OVP)
- Pack Under-Voltage Protection (UVP) and Over-Voltage Protection (OVP)
- Cells Low/High-Temperature Protection
- Die High-Temperature Protection
Integrated High-Side FET (HS-FET) Driver:
- Capable of Driving More than 4 Parallel N-Channel MOSFETs
- DSG Soft Start without a Pre-Biasing Circuit
- GPIO or Register Control FET
Automatic or Manual Cell-Balancing
Delicate Functions:
- Reduced Current Standby Mode
- Open-Wire Detection
- Persistent Dead Battery Flag
- Lockable Multiple-Time Programmable (MTP) Memory for Protection Thresholds
Random Cell Connection Tolerant
Available in a TQFP-48 (7mmx7mm) Package