LP2952-N, LP2952A, LP2953, LP2953A

SNVS095F – MAY 2004 – REVISED MARCH 2015

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Table of Contents

7.3

Feature Description................................................. 15

1

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

7.4

Device Functional Mode ......................................... 16

2

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

8

Application and Implementation ........................ 17

3

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

8.1

Application Information............................................ 17

4

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

8.2

Typical Applications ................................................ 21

5

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

9

Power Supply Recommendations ...................... 30

6

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

10

Layout................................................................... 31

6.1

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

10.1

Layout Guidelines ................................................. 31

6.2

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

10.2

Layout Example .................................................... 31

6.3

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

10.3

Power Dissipation: Heatsink Requirements

6.4

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

(Industrial Temperature Range Devices) ................. 32

6.5

Electrical Characteristics: 3.3-V Versions ................. 5

11

Device and Documentation Support ................. 34

6.6

Electrical Characteristics: 5-V Versions .................... 5

11.1

Related Links ........................................................ 34

6.7

Electrical Characteristics: All Voltage Options .......... 6

11.2

Trademarks ........................................................... 34

6.8

Typical Characteristics .............................................. 9

11.3

Electrostatic Discharge Caution ............................ 34

7

Detailed Description ............................................ 14

11.4

Glossary ................................................................ 34

7.1

Overview ................................................................. 14

12

Mechanical, Packaging, and Orderable

7.2

Functional Block Diagrams ..................................... 14

Information ........................................................... 34

4 Revision History

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

Changes from Revision E (December 2014) to Revision F

Page

•

Deleted "Assured" .................................................................................................................................................................. 1

•

Changed "Output Pulldown Crowbar" to "Automatic Output Discharge" ............................................................................... 1

•

Changed "internal crowbar" to "automatic output discharge" ................................................................................................. 1

•

Added word "input" after "battery" in Features and Description ............................................................................................. 1

•

Changed pin names for IN and OUT to match TI nomenclature; fix typos ............................................................................ 1

•

Changed max junc. temp from 125°C to 150°C .................................................................................................................... 4

•

Changed wording of footnote 12 ........................................................................................................................................... 8

•

Added second bullet for "LP2953 versions only" ................................................................................................................. 14

•

Added Automatic Output Dischange subsection ................................................................................................................. 16

•

Deleted sentence "To achieve the smallest form factor, the TO-92 package is selected.".................................................. 22

•

Changed "With an efficiency of 83.3% and a 250-mA maximum load, the internal power dissipation is 250 mW,

19.2° above the ambient temperature."................................................................................................................................ 22

•

Deleted "Thermal Resistance for Various Copper Heatsinking Patterns" table ................................................................... 33

Changes from Revision D (September 2013) to Revision E

Page

•

Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional

Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device

and Documentation Support section, and Mechanical, Packaging, and Orderable Information section; updated

Thermal Information values; deleted obsolete LP2953AM references .................................................................................. 1

Changes from Revision C (March 2005) to Revision D

Page

•

Changed layout of National Data Sheet to TI format ........................................................................................................... 30

2

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