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BQ41Z50 2-Series, 3-Series, and 4-Series Cell Battery Pack Manager with Dynamic Z-Track
SLUSFB5A
June 2024 – April 2025
BQ41Z50
PRODUCTION DATA
CONTENTS
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BQ41Z50 2-Series, 3-Series, and 4-Series Cell Battery Pack Manager with Dynamic Z-Track
1
1
Features
2
Applications
3
Description
4
Pin Configuration and Functions
4.1
Pin Equivalent Diagrams
5
Specifications
5.1
Absolute Maximum Ratings
5.2
ESD Ratings
5.3
Recommended Operating Conditions
5.4
Thermal Information
5.5
Supply Current
5.6
Power Supply Control
5.7
Low Dropout Regulators
5.8
Internal Oscillators
5.9
Voltage References
5.10
Current Wake Detector
5.11
VC0, VC1, VC2, VC3, VC4, PACK
5.12
Cell Balancing Support
5.13
SMBD, SMBC
5.14
PRES/SHUTDN, DISP
5.15
ALERT
5.16
LEDCNTLA, LEDCNTLB, LEDCNTLC
5.17
Coulomb Counter
5.18
Coulomb Counter Digital Filter (CC1)
5.19
Current Measurement Digital Filter (CC2)
5.20
Analog-to-Digital Converter
5.21
ADC Digital Filter
5.22
CHG, DSG High-side NFET Drivers
5.23
Precharge (PCHG) FET Drive
5.24
FUSE Drive
5.25
Internal Temperature Sensor
5.26
TS1, TS2, TS3, TS4
5.27
Flash Memory
5.28
OT, SCD, OCC, OCD1, OCD2 Protection Thresholds (SCOMP)
5.29
OT, SCD, OCC, OCD1, OCD2 Protection Timing (SCOMP)
5.30
GPIO1, GPIO2, GPIO3, GPIO4, GPIO5, GPIO6, GPIO7
5.31
Elliptical Curve Cryptography (ECC)
5.32
SMBus Interface Timing
5.33
Typical Characteristics
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagram
6.3
Feature Description
6.3.1
Primary (1st Level) Safety Features
6.3.2
Secondary (2nd Level) Safety Features
6.3.3
Charge Control Features
6.3.4
Gas Gauging
6.3.5
Lifetime Data Logging Features
6.3.6
Authentication
6.3.7
Configuration
6.3.7.1
Oscillator Function
6.3.7.2
Real Time Clock
6.3.7.3
System Present Operation
6.3.7.4
Emergency Shutdown
6.3.7.5
2-Series, 3-Series, or 4-Series Cell Configuration
6.3.7.6
Cell Balancing
6.3.7.7
LED Display
6.3.8
Battery Parameter Measurements
6.3.8.1
Charge and Discharge Counting
6.3.8.2
Voltage
6.3.8.3
Current
6.3.8.4
Temperature
6.3.8.5
Communications
6.3.8.5.1
SMBus On and Off State
6.3.8.5.2
SBS Commands
6.4
Device Functional Modes
7
Applications and Implementation
7.1
Application Information
7.2
Typical Applications
7.2.1
Design Requirements
7.2.2
Detailed Design Procedure
7.2.2.1
High-Current Path
7.2.2.1.1
Protection FETs
7.2.2.1.2
Chemical Fuse
7.2.2.1.3
Lithium-Ion Cell Connections
7.2.2.1.4
Sense Resistor
7.2.2.1.5
ESD Mitigation
7.2.2.2
Gas Gauge Circuit
7.2.2.2.1
Coulomb-Counting Interface
7.2.2.2.2
Low-dropout Regulators (LDOs)
7.2.2.2.2.1
REG18
7.2.2.2.2.2
REG135
7.2.2.2.3
System Present
7.2.2.2.4
SMBus Communication
7.2.2.2.5
FUSE Circuitry
7.2.2.3
Secondary-Current Protection
7.2.2.3.1
Cell and Battery Inputs
7.2.2.3.2
External Cell Balancing
7.2.2.3.3
PACK and FET Control
7.2.2.3.4
Temperature Measurement
7.2.2.3.5
LEDs
7.2.3
Application Curves
7.3
Configuring Device Firmware
8
Power Supply Recommendations
9
Layout
9.1
Layout Guidelines
9.1.1
Protector FET Bypass and Pack Terminal Bypass Capacitors
9.1.2
ESD Spark Gap
9.2
Layout Example
10
Device and Documentation Support
10.1
Third-Party Products Disclaimer
10.2
Documentation Support
10.2.1
Related Documentation
10.3
Receiving Notification of Documentation Updates
10.4
Support Resources
10.5
Trademarks
10.6
Electrostatic Discharge Caution
10.7
Glossary
11
Revision History
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
RSN|32
MPQF194B
Thermal pad, mechanical data (Package|Pins)
Orderable Information
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Data Sheet
BQ41Z50
2-Series, 3-Series, and 4-Series Cell Battery Pack Manager with
Dynamic Z-Track