NXP MC33771B
MC33771B - 14-Channel Li-ion Battery Cell Controller IC

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
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