14-Channel Li-Ion Battery Cell Controller IC

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.

Datasheet, Safety Manual and Application Hint available with non-disclosure agreement (NDA). For additional information, contact your local NXP Sales Office.

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Block Diagram

MC33771 and MC33664 High-Voltage Battery Management System

MC33771 and MC33664 High-Voltage Battery Management System
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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.

Key Parametrics

  • Cell Voltage Measurement Channel
    7to14, 7to8
  • Cell OV/UV
    yes
  • Cell Balancing
    no, yes
  • Coulomb Count
    no, yes
  • Number of Battery Cells
    14, 8

Comparison Table

Parameter MC33771B MC33771C MC33772B MC33772C
Voltage Channels 7..14 7..14 3..6 3..6
Supply VRange (Max) 9.6 V..61.6 V (75 V) 9.6 V..61.6V (75 V) 6 V..30 V (40 V) 6 V..30 V (40 V)
Cell Input Voltage Range -0.3 V to 5 V -0.3 V to 5 V -0.3 V to 5 V -0.3 V to 5 V
Measurement Error ± 0.8 mV (Vcell =3.3 v Ta = 25°c) ± 0.8 mV (Vcell =3.3 v Ta = 25°c) ± 0.8 mV (Vcell =3.3 v Ta = 25°c) ± 0.8 mV (Vcell =3.3 v Ta = 25°c)
Total Measurement Error
(After aging: MLS3 and 1000h HTOL)		 ± 3.9 mV ± 3.9 mV ± 3.9 mV ± 3.9 mV
Vpwr=9.6V..61.6V,
Vcell=1.5V..4.3V, -40~85°C		 Vpwr=9.6V..61.6V,
Vcell=1.5V..4.3V, -40°C..85°C		 Vpwr=6V..30V,
Vcell=1.5V..4.3V, -40~85°C		 Vpwr=6V..30V,
Vcell=1.5V..4.3V, -40~85°C
Measurement averaging No Configurable Averaging
Samples 2n n=0..8, (1,2,4,..256)		 No Configurable Averaging
Samples 2n n=0..8, (1,2,4,..256)
Functional Safety ASIL C
ASIL D Compliance 		ASIL C
ASIL D Compliance 		ASIL C
ASIL D Compliance 		ASIL C
ASIL D Compliance
Isolated communication Speed 2 Mbps 2 Mbps 2 Mbps 2 Mbps
Communication Isolation Inductive Inductive, Capacitive Inductive Inductive, Capacitive
Max Nodes per Daisy Chain 15 63 15 63
CRC Bit 8 8 8 8
Comms bit 40 48 40 48
Integrated Balancing <300 mA, Timer <300 mA, Timer <300 mA, Timer <300 mA, Timer
Balancing sleep mode Yes Yes Yes Yes
GPIO / Analog measurement inputs 7 7 7 7
I2C Controller EEPROM Only EEPROM Only EEPROM Only EEPROM Only
Current Channels 1 1 1 1
Coulomb counter 1 1 1 1
Package 64-pin LQFP-EP (-40~105°C) 64-pin LQFP-EP (-40~105°C) 48-pin LQFP-EP (-40~105°C) 48-pin LQFP-EP (-40~105°C)

Battery Management Systems (BMS)

Battery Management Systems (BMS) Hardware Solutions

Battery Management Systems (BMS) Hardware Solutions

Battery management systems (BMS) solutions for automotive and industrial applications including 12 V, 48 V, high-voltage and battery pack monitoring applications.

Find your right solution.

SafeAssure Program

SafeAssure Functional Safety Program

SafeAssure Functional Safety Program

When it comes to functional safety, NXP stands for quality and reliability. Our SafeAssure program simplifies system-level safety requirements in accordance with ISO 26262.
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