LP3907 Datasheet, PDF (2/58 Pages) National Semiconductor (TI) – Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C Compatible Interface

LP3907
SNVS511S – JUNE 2007 – REVISED APRIL 2016
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Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Tables................................... 3
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 6
7.1 Absolute Maximum Ratings ...................................... 6
7.2 ESD Ratings.............................................................. 6
7.3 Recommended Operating Conditions (Bucks).......... 6
7.4 Thermal Information .................................................. 7
7.5 General Electrical Characteristics............................ 7
7.6 Low Dropout Regulators, LDO1 And LDO2............. 8
7.7 Buck Converters SW1, SW2.................................... 8
7.8 I/O Electrical Characteristics.................................... 9
7.9 Power-On Reset (POR) Threshold/Function .......... 9
7.10 I²C Interface Timing Requirements ....................... 9
7.11 Typical Characteristics — LDO............................. 10
7.12 Typical Characteristics — Bucks .......................... 12
7.13 Typical Characteristics — Buck1 .......................... 13
7.14 Typical Characteristics — Buck2 .......................... 14
7.15 Typical Characteristics — Bucks .......................... 15
8 Detailed Description ............................................ 17
8.1 Overview ................................................................. 17
8.2 Functional Block Diagram ....................................... 17
8.3 Feature Description................................................. 18
8.4 Device Functional Modes........................................ 26
8.5 Programming .......................................................... 27
8.6 Register Maps ........................................................ 30
9 Application and Implementation ........................ 40
9.1 Application Information............................................ 40
9.2 Typical Application ................................................. 40
10 Power Supply Recommendations ..................... 46
10.1 Analog Power Signal Routing ............................... 46
11 Layout................................................................... 47
11.1 DSBGA Layout Guidelines.................................... 47
11.2 Layout Example .................................................... 48
11.3 Thermal Considerations of WQFN Package......... 48
12 Device and Documentation Support ................. 49
12.1 Documentation Support ........................................ 49
12.2 Trademarks ........................................................... 49
12.3 Community Resources.......................................... 49
12.4 Electrostatic Discharge Caution ............................ 49
12.5 Glossary ................................................................ 49
13 Mechanical, Packaging, and Orderable
Information ........................................................... 49
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision R (May 2015) to Revision S
Page
• Added additional items to Applications .................................................................................................................................. 1
• Changed symbol "θn" to "e_N" in Low Dropout Regulators, LDO1 And LDO2 Electrical Char table ....................................... 8
Changes from Revision Q (January 2015) to Revision R
Page
• Added last sentence to "NOTE" .......................................................................................................................................... 21
Changes from Revision P (November 2014) to Revision Q
Page
• Changed to new Default Device Options table with updated and additional values .............................................................. 3
• Changed Handling Ratings table to ESD Ratings table ........................................................................................................ 6
• Added updated Thermal Information ..................................................................................................................................... 7
Changes from Revision O (May 2013) to Revision P
Page
• Added Device Information and Handling Rating tables, Feature Description, Device Functional Modes, Application
and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and
Mechanical, Packaging, and Orderable Information sections; moved some curves to Application Curves section .............. 1
2
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