LP3907-Q1

SNVSA55A – DECEMBER 2014 – REVISED MAY 2015

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Table of Contents

1

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

8

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

8.1

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

2

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

8.2

Functional Block Diagram ....................................... 15

3

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

8.3

Feature Description................................................. 16

4

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

8.4

Device Functional Modes........................................ 25

5

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

8.5

Programming .......................................................... 25

6

Pin Configuration and Functions ......................... 4

8.6

Register Maps ........................................................ 28

7

Specifications......................................................... 6

9

Application and Implementation ........................ 38

7.1

Absolute Maximum Ratings ...................................... 6

9.1

Application Information............................................ 38

7.2

ESD Ratings.............................................................. 6

9.2

Typical Application ................................................. 38

7.3

Recommended Operating Conditions (Bucks).......... 6

10

Power Supply Recommendations ..................... 43

7.4

Thermal Information .................................................. 7

10.1

Analog Power Signal Routing ............................... 43

7.5

General Electrical Characteristics............................ 7

11

Layout................................................................... 44

7.6

Low Dropout Regulators, LDO1 And LDO2............. 7

11.1

DSBGA Layout Guidelines.................................... 44

7.7

Buck Converters SW1, SW2.................................... 8

11.2

Layout Example .................................................... 45

7.8

I/O Electrical Characteristics.................................... 9

11.3

Thermal Considerations of WQFN Package......... 45

7.9

Power-On Reset Threshold/Function (POR) ........... 9

12

Device and Documentation Support ................. 46

7.10

12.1

Documentation Support ........................................ 46

7.11

Typical Characteristics — LDO............................... 9

12.2

Trademarks ........................................................... 46

7.12

Typical Characteristics — Bucks .......................... 11

12.3

Electrostatic Discharge Caution ............................ 46

7.13

Typical Characteristics — Buck1 .......................... 12

12.4

Glossary ................................................................ 46

7.14

Typical Characteristics — Buck2 .......................... 12

13

Mechanical, Packaging, and Orderable

7.15

Typical Characteristics — Bucks .......................... 13

Information ........................................................... 46

4 Revision History

Changes from Original (December 2014) to Revision A

Page

•

Added last sentence to "NOTE" .......................................................................................................................................... 19

2

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