SLUSDW2A
November 2021 – February 2022
BQ27Z746
PRODUCTION DATA
1
Features
2
Applications
3
Description
4
Revision History
5
Pin Configurations and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.5.1
Supply Current
6.5.2
Common Analog (LDO, LFO, HFO, REF1, REF2, I-WAKE)
6.5.3
Battery Protection (CHG, DSG)
6.5.4
Cell Sensing Output (BAT_SP, BAT_SN)
6.5.5
Gauge Measurements (ADC, CC, Temperature)
6.5.6
Flash Memory
6.6
Digital I/O: DC Characteristics
6.7
Digital I/O: Timing Characteristics
6.8
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
BQ27Z746 Processor
7.3.2
Battery Parameter Measurements
7.3.2.1
Coulomb Counter (CC) and Digital Filter
7.3.2.2
ADC Multiplexer
7.3.2.3
Analog-to-Digital Converter (ADC)
7.3.2.4
Internal Temperature Sensor
7.3.2.5
External Temperature Sensor Support
7.3.3
Power Supply Control
7.3.4
Bus Communication Interface
7.3.5
Low Frequency Oscillator
7.3.6
High Frequency Oscillator
7.3.7
1.8-V Low Dropout Regulator
7.3.8
Internal Voltage References
7.3.9
Overcurrent in Discharge Protection
7.3.10
Overcurrent in Charge Protection
7.3.11
Short-Circuit Current in Discharge Protection
7.3.12
Primary Protection Features
7.3.13
Battery Sensing
7.3.14
Gas Gauging
7.3.15
Zero Volt Charging (ZVCHG)
7.3.16
Charge Control Features
7.3.17
Authentication
7.4
Device Functional Modes
7.4.1
Lifetime Logging Features
7.4.2
Configuration
7.4.2.1
Coulomb Counting
7.4.2.2
Cell Voltage Measurements
7.4.2.3
Auto Calibration
7.4.2.4
Temperature Measurements
8
Applications and Implementation
8.1
Application Information
8.2
Typical Applications
8.2.1
Design Requirements (Default)
8.2.2
Detailed Design Procedure
8.2.2.1
Changing Design Parameters
8.2.3
Calibration Process
8.2.4
Gauging Data Updates
8.2.4.1
Application Curve
9
Power Supply Requirements
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
Device and Documentation Support
11.1
Third-Party Products Disclaimer
11.2
Documentation Support
11.2.1
Related Documentation
11.3
Receiving Notification of Documentation Updates
11.4
Support Resources
11.5
Trademarks
11.6
Electrostatic Discharge Caution
11.7
Glossary
12
Mechanical, Orderable, and Packaging Information
Package Options
Mechanical Data (Package|Pins)
YAH|15
MXBG425
Thermal pad, mechanical data (Package|Pins)
Orderable Information
slusdw2a_oa
slusdw2a_pm
1
Features
Integrated battery gas gauge and protector
Flash-programmable custom BQBMP RISC CPU
SHA-256 authentication
400-kHz I
2
C bus communications interface
Low-voltage (2.0 V) operation
Two independent precision 16-bit ADCs
Coulomb counting ADC with current sense resistor down to 1 mΩ
Voltage ADC for cell voltage and external and internal temperature sensors
Battery fuel gauging based on patented
Impedance Track™
technology
Models battery discharge curve for accurate time-to-empty predictions
Automatically adjusts for aging-, temperature-, and rate-induced effects on the battery
Battery Kelvin sense differential analog output pins with built-in protection
High-side or low-side current sensing
Programmable hardware-based protection
High-side FET gate drivers
Overvoltage and undervoltage (OVP and UVP)
Overcurrent in discharge and overcurrent in charge (OCD and OCC)
Short circuit in discharge (SCD)
Firmware-based overtemperature (OT)
Reduced typical power modes
SLEEP mode: 20 μA
SHIP mode: 10 μA
SHELF mode 5 μA
SHUTDOWN mode: 0.2 μA
Ultra-compact, 15-ball
NanoFree™
DSBGA