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

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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.

Data Sheet

Application Notes

Product Details

Block Diagram

MC33771 and MC33664 High-Voltage Battery Management System

Get diagram PDF

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
4 Mbps 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 V_Range (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
Total Measurement Error (After aging: MLS3 and 1000h HTOL)	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) Hardware Solutions

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

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SafeAssure 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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