LP3972

SNVS468L – SEPTEMBER 2006 – REVISED NOVEMBER 2015

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Table of Contents

7.14

Typical Characteristics ......................................... 13

1

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

8

Detailed Description ............................................ 15

2

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

8.1

Overview ................................................................. 15

3

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

8.2

Functional Block Diagram ....................................... 16

4

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

8.3

Feature Description................................................. 17

5

Device Comparison Tables................................... 3

8.4

Device Functional Modes........................................ 21

6

Pin Configuration and Functions ......................... 5

8.5

Programming........................................................... 21

7

Specifications......................................................... 7

8.6

Register Maps ......................................................... 30

7.1

Absolute Maximum Ratings ...................................... 7

9

Application and Implementation ........................ 48

7.2

ESD Ratings ............................................................ 7

9.1

Application Information............................................ 48

7.3

Recommended Operating Conditions ....................... 7

9.2

Typical Application ................................................. 48

7.4

Thermal Information .................................................. 8

10

Power Supply Recommendations ..................... 54

7.5

Electrical Characteristics........................................... 8

11

Layout................................................................... 55

7.6

Electrical Characteristics: LDO RTC......................... 8

11.1

Layout Guidelines ................................................. 55

7.7

Electrical Characteristics: LDOs 1 to 5 ..................... 9

11.2

Layout Example .................................................... 56

7.8

Electrical Characteristics: Buck Converters SW1,

SW2, SW3 ............................................................... 10

12

Device and Documentation Support ................. 57

7.9

Electrical Characteristics: Backup Charger............. 10

12.1

Device Support...................................................... 57

7.10

12.2

Related Documentation ....................................... 57

Interface (SDA and SCL) ......................................... 11

12.3

Community Resources.......................................... 57

7.11

Logic Inputs and Outputs DC Operating

12.4

Trademarks ........................................................... 57

Conditions ................................................................ 11

12.5

Electrostatic Discharge Caution ............................ 57

7.12

12.6

Glossary ................................................................ 57

Requirements (SDA and SCL)................................. 12

13

Mechanical, Packaging, and Orderable

7.13

Power-On Timing Delays ...................................... 12

Information ........................................................... 57

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision K (May 2013) to Revision L

Page

•

Added Device Information and Pin Configuration and Functions sections, ESD Ratings and Thermal Information

tables, Feature Description, Device Functional Modes, Application and Implementation, Power Supply

Recommendations, Layout, Device and Documentation Support, and Mechanical, Packaging, and Orderable

Information sections................................................................................................................................................................ 1

Changes from Revision J (May 2013) to Revision K

Page

•

Changed layout of National Data Sheet to TI format ........................................................................................................... 55

2

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