bq27421-G1

SLUSB85E – MAY 2013 – REVISED JANUARY 2016

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Table of Contents

7.13

Typical Characteristics ............................................ 8

1

Features .................................................................. 1

8

Detailed Description .............................................. 9

2

Applications ........................................................... 1

8.1

Overview ................................................................... 9

3

Description ............................................................. 1

8.2

Functional Block Diagram ......................................... 9

4

Revision History..................................................... 2

8.3

Feature Description................................................... 9

5

Device Comparison Table..................................... 3

8.4

Device Functional Modes........................................ 10

6

Pin Configuration and Functions ......................... 3

8.5

Programming........................................................... 10

7

Specifications......................................................... 4

9

Applications and Implementation ...................... 14

7.1

Absolute Maximum Ratings ...................................... 4

9.1

Application Information............................................ 14

7.2

ESD Ratings ............................................................ 4

9.2

Typical Applications ................................................ 15

7.3

Recommended Operating Conditions ....................... 4

10

Power Supply Recommendation ....................... 18

7.4

Thermal Information .................................................. 5

10.1

Power Supply Decoupling ..................................... 18

7.5

Supply Current .......................................................... 5

11

Layout................................................................... 19

7.6

Digital Input and Output DC Characteristics ............. 5

11.1

Layout Guidelines ................................................. 19

7.7

LDO Regulator, Wake-Up, and Auto-Shutdown DC

11.2

Layout Example .................................................... 19

Characteristics ........................................................... 5

7.8

ADC (Temperature and Cell Measurement)

12

Device and Documentation Support ................. 20

Characteristics ........................................................... 6

12.1

Documentation Support ........................................ 20

7.9

Integrating ADC (Coulomb Counter) Characteristics

12.2

Community Resources.......................................... 20

................................................................................... 6

12.3

Trademarks ........................................................... 20

7.10

Integrated Sense Resistor Characteristics, –40°C to

12.4

Electrostatic Discharge Caution ............................ 20

85°C .......................................................................... 6

12.5

Glossary ................................................................ 20

7.11

Integrated Sense Resistor Characteristics, –40°C to

13

Mechanical, Packaging, and Orderable

70°C .......................................................................... 6

Information ........................................................... 20

7.12

Characteristics ........................................................... 6

4 Revision History

Changes from Revision D (July 2015) to Revision E

Page

•

Changed Pin Configuration and Functions............................................................................................................................. 3

•

Changed Mechanical, Packaging, and Orderable Information ............................................................................................ 20

Changes from Revision C (December 2014) to Revision D

Page

•

Changed the Integrated Sense Resistor Characteristics, –40°C to 85°C specifications ...................................................... 6

•

Changed the Integrated LDO Capacitor section ................................................................................................................. 16

•

Added Community Resources ............................................................................................................................................. 20

Changes from Revision B (November 2014) to Revision C

Page

•

Changed simplified schematic by adding 1-µF capacitor ....................................................................................................... 1

•

Added description for connecting a 1-µF capacitor ................................................................................................................ 3

•

Added information for connecting GPOUT ............................................................................................................................. 3

•

Changed connection description for BAT pin ....................................................................................................................... 18

•

Changed "recommend" to "required".................................................................................................................................... 19

2

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