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BQ27427 System-Side Impedance Track™ Fuel Gauge With Integrated Sense Resistor
SLUSEB5A
December 2022 – October 2023
BQ27427
PRODUCTION DATA
CONTENTS
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BQ27427 System-Side Impedance Track™ Fuel Gauge With Integrated Sense Resistor
1
1
Features
2
Applications
3
Description
4
Pin Configuration and Functions
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
Digital Input and Output DC Characteristics
5.7
LDO Regulator, Wake-up, and Auto-Shutdown DC Characteristics
5.8
LDO Regulator, Wake-up, and Auto-Shutdown AC Characteristics
5.9
ADC (Temperature and Cell Measurement) Characteristics
5.10
Integrating ADC (Coulomb Counter) Characteristics
5.11
Integrated Sense Resistor Characteristics, –40°C to 85 °C
5.12
I2C-Compatible Interface Communication Timing Characteristics
5.13
SHUTDOWN and WAKE-UP Timing
5.14
Typical Characteristics
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagram
6.3
Feature Description
6.3.1
Communications
6.3.1.1
I2C Interface
6.3.1.2
I2C Time Out
6.3.1.3
I2C Command Waiting Time
6.3.1.4
I2C Clock Stretching
6.4
Device Functional Modes
7
Application 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
BAT Voltage Sense Input
7.2.2.2
Integrated LDO Capacitor
7.2.3
External Thermistor Support
7.2.4
Application Curves
8
Power Supply Recommendation
8.1
Power Supply Decoupling
9
Layout
9.1
Layout Guidelines
9.2
Layout Example
10
Device and Documentation Support
10.1
Documentation Support
10.1.1
Third-Party Products Disclaimer
10.1.2
Related Documentation
10.2
Trademarks
10.3
Electrostatic Discharge Caution
10.4
Glossary
11
Revision History
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
YZF|9
MXBG027N
Thermal pad, mechanical data (Package|Pins)
Orderable Information
sluseb5a_oa
sluseb5a_pm
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Full reading width
Full reading width
Comfortable reading width
Expanded reading width
Card for each section
Card with all content
Data Sheet
BQ27427 System-Side Impedance Track™ Fuel Gauge With Integrated Sense Resistor
1
Features
Single-cell Li-ion battery fuel gauge
Resides on system board
Supports embedded or removable batteries
Powers directly from the battery with integrated LDO
Integrates low-value sense resistor (7 mΩ)
Ultra low power consumption in NORMAL (50 µA) and SLEEP (9 µA) modes
Battery fuel gauging based on patented
Impedance Track™
technology
Provides three selectable preprogrammed profiles for 4.2-V, 4.35-V, and 4.4-V cells
Reports remaining capacity and state-of-charge (SOC) with smoothing filter
Adjusts automatically for battery aging, self-discharge, temperature, and rate changes
Estimates battery state-of-health (aging)
Microcontroller peripheral interface supports:
400-kHz I
2
C serial interface
Configurable SOC interrupt or
battery low digital output warning
Internal temperature sensor or host reported temperature or external thermistor
2
Applications
Smartphones, feature phones
, and
tablets
Wearables
Building automation
Portable medical/industrial handsets
Portable audio
Gaming