LM26420, LM26420-Q0, LM26420-Q1
SNVS579J –FEBRUARY 2009–REVISED SEPTEMBER 2015
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Table of Contents
1
2
3
4
5
6
Features.................................................................. 1
Applications ........................................................... 1
Description ............................................................. 1
Revision History..................................................... 2
Pin Configuration and Functions......................... 3
Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings (LM26420X/Y) .................................... 5
6.3 ESD Ratings (Automotive-LM26420-Q0/Q1) ............ 5
6.4 Recommended Operating Conditions....................... 5
6.5 Thermal Information.................................................. 5
6.6 Electrical Characteristics Per Buck........................... 6
6.7 Typical Characteristics.............................................. 7
Detailed Description ............................................ 13
7.1 Overview ................................................................. 13
7.2 LM26420 Functional Block Diagram....................... 14
7.3 Feature Description................................................. 14
7.4 Device Functional Modes........................................ 15
8
Application and Implementation ........................ 16
8.1 Application Information............................................ 16
8.2 Typical Applications ............................................... 19
Power Supply Recommendations...................... 30
9
10 Layout................................................................... 31
10.1 Layout Guidelines ................................................. 31
10.2 Layout Example .................................................... 32
10.3 Thermal Considerations........................................ 32
11 Device and Documentation Support ................. 35
11.1 Device Support...................................................... 35
11.2 Documentation Support ........................................ 35
11.3 Related Links ........................................................ 35
11.4 Community Resources.......................................... 35
11.5 Trademarks........................................................... 35
11.6 Electrostatic Discharge Caution............................ 35
11.7 Glossary................................................................ 35
7
12 Mechanical, Packaging, and Orderable
Information ........................................................... 36
4 Revision History
Changes from Revision I (June 2015) to Revision J
Page
•
fixed error in WQFN Pin Functions - shifted "Description" column down one row and added back description for
VIND1 pin................................................................................................................................................................................ 3
•
•
Changed reference from "Typical Applications" to "Table 1". ............................................................................................. 21
Deleted definition for RDS (not part of equation 15) ............................................................................................................. 22
Changes from Revision H (August 2014) to Revision I
Page
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•
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Changed "Frequency" to "Efficiency" in title; add new Feature bullet re: CISPR25............................................................... 1
Added new Application .......................................................................................................................................................... 1
Changed moved Storage temperature to Absolute Maximum Ratings table ......................................................................... 5
Changed figure 36 caption .................................................................................................................................................. 13
Added part number to caption wording ................................................................................................................................ 14
Added application note ........................................................................................................................................................ 16
Changed title of Thermal Guidelines to Thermal Considerations and moved the section to the correct location................ 32
Added Related Documentation and Community Resources subsections............................................................................ 35
Changes from Revision G (July 2014) to Revision H
Page
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Changed percent sign to suffix .............................................................................................................................................. 6
Changes from Revision F (March 2013) to Revision G
Page
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Added automotive Grade 0..................................................................................................................................................... 1
Changed formatting to match new TI datasheet guidelines; added Device Information and Handling Ratings tables,
Layout, and Device and Documentation Support sections; reformatted Functional Description to Detailed
Description and Applications to Applications and Implementation sections........................................................................... 1
•
Changed to new equation..................................................................................................................................................... 33
2
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