NXP MC33771B

The MC33771 is a Li-Ion battery cell controller IC designed for automotive and industrial applications such as HEV, EV, ESS, UPS systems. Featuring:

• ADC conversions on the differential cell voltages and currents as well as coulomb counting and temperature measurements.
• Embedded balancing transistors and diagnostics to simplify applications.
• Support standard SPI and transformer isolated daisy chain communication (with MC33664) to an MCU for processing and control.
• The MC33771 is compliant with MPC5xxx 32-bit MCU families.

Features

• Supply Voltage
  • 9.6 V ≤ VPWR ≤ 61.6 V operation, 75 V transient
• Advanced Voltage and Temperature Measurement
  • 14 Cell Voltage Measurement Channels
  • Total Stack Voltage Measurement
  • 0.8 mV maximum total voltage measurement error
  • 7 ADC/GPIO/Temperature Sensor Inputs
• Synchronized Advanced Current Measurement
  • Integrated Current sensor with PGA
  • ±0.5% accuracy from milliamps to kiloamps
  • Integrated Coulomb Counter
• Onboard Passive Balancing
  • Onboard 300mA Low Rdson passive cell balancing MOSFETs with diagnostics
  • Balancing in Sleep mode
  • Programmable balancing timer for each MOSFET
• Isolated Daisy Chain or SPI communication
  • 2.0 Mbps, 2 wire twisted pair differential, isolated
  • Addressable on initialization
  • 4Mbps SPI
• Diagnostics, Functional Safety and Robustness
  • OV/UV, OT/UT, OC fault verification
  • Sleep mode OV/UV, OT/UT monitoring
  • Support ISO 26262, up to ASIL D safety capability
  • Hot plug capable and AEC Q-100
• Product Longevity Program
  • This product is included in the NXP Product Longevity program ensuring a stable supply of products for your embedded designs. MC33771B is included in the 15-year program

Applications

• Automotive
  • Battery Management System
• Industrial
  • E-bikes, E-scooters
  • Energy Storage Systems (ESS)

Block diagram

Click here to enlarge the image