900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






etcTI

LM3940 Datasheet Preview

LM3940 Datasheet

1-A Low-Dropout Regulator

No Preview Available !

Product
Folder
Order
Now
Technical
Documents
Tools &
Software
Support &
Community
LM3940
SNVS114G – MAY 1999 – REVISED FEBRUARY 2015
LM3940 1-A Low-Dropout Regulator for 5-V to 3.3-V Conversion
1 Features
1 Input Voltage Range: 4.5 V to 5.5 V
• Output Voltage Specified over Temperature
• Excellent Load Regulation
• Specified 1-A Output Current
• Requires only One External Component
• Built-in Protection against Excess Temperature
• Short-Circuit Protected
2 Applications
• Laptop and Desktop Computers
• Logic Systems
3 Description
The LM3940 is a 1-A low-dropout regulator designed
to provide 3.3 V from a 5-V supply.
The LM3940 is ideally suited for systems which
contain both 5-V and 3.3-V logic, with prime power
provided from a 5-V bus.
Because the LM3940 is a true low dropout regulator,
it can hold its 3.3-V output in regulation with input
voltages as low as 4.5 V.
The TO-220 package of the LM3940 means that in
most applications the full 1 A of load current can be
delivered without using an additional heatsink.
The surface mount DDPAK/TO-263 package uses
minimum board space, and gives excellent power
dissipation capability when soldered to a copper
plane on the PC board.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
SOT-223 (4)
6.50 mm x 3.50 mm
LM3940
DDPAK/TO-263 (3) 10.18 mm x 8.41 mm
TO-220 (3)
14.986 mm x 10.16 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
*Required if regulator is located more than 1 inch from the power supply filter capacitor or if battery power is used.
**See Application and Implementation.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




etcTI

LM3940 Datasheet Preview

LM3940 Datasheet

1-A Low-Dropout Regulator

No Preview Available !

LM3940
SNVS114G – MAY 1999 – REVISED FEBRUARY 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 6
7 Detailed Description .............................................. 8
7.1 Overview ................................................................... 8
7.2 Functional Block Diagram ......................................... 8
7.3 Feature Description................................................... 8
7.4 Device Functional Modes.......................................... 8
8 Application and Implementation .......................... 9
8.1 Application Information.............................................. 9
8.2 Typical Application .................................................... 9
9 Power Supply Recommendations...................... 11
10 Layout................................................................... 11
10.1 Layout Guidelines ................................................. 11
10.2 Layout Example .................................................... 11
10.3 Heatsinking ........................................................... 11
11 Device and Documentation Support ................. 15
11.1 Documentation Support ........................................ 15
11.2 Receiving Notification of Documentation Updates 15
11.3 Community Resources.......................................... 15
11.4 Trademarks ........................................................... 15
11.5 Electrostatic Discharge Caution ............................ 15
11.6 Glossary ................................................................ 15
12 Mechanical, Packaging, and Orderable
Information ........................................................... 15
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision F (November 2014) to Revision G
Page
• Changed pin names to TI nomenclature ................................................................................................................................ 1
• Deleted soldering information from Ab Max; this info is in POA ........................................................................................... 4
• Changed Handling Ratings table to ESD Ratings table; move storage temp to Ab Max ...................................................... 4
• Changed values in Input supply voltage row, ROC table ...................................................................................................... 4
• Changed IL to IOUT .................................................................................................................................................................. 5
Changes from Revision E (March 2013) to Revision F
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;
update thermal values ............................................................................................................................................................ 1
Changes from Revision D (March 2013) to Revision E
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 14
2
Submit Documentation Feedback
Product Folder Links: LM3940
Copyright © 1999–2015, Texas Instruments Incorporated



Part Number LM3940
Description 1-A Low-Dropout Regulator
Maker etcTI
Total Page 3 Pages
PDF Download

LM3940 Datasheet PDF





Similar Datasheet

1 LM394 LM194/LM394 Supermatch Pair
National Semiconductor
2 LM3940 1A Low Dropout Regulator
National Semiconductor
3 LM3940 Voltage Regulator
ETC
4 LM3940 1-A Low-Dropout Regulator
etcTI





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy