Electronic Components Datasheet Search
Selected language     English  ▼
Part Name
         Description


LM2678S-12 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM2678S-12
Description  SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator
Download  23 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo 

 
 1 page
background image
LM2678
SIMPLE SWITCHER® High Efficiency 5A Step-Down
Voltage Regulator
General Description
The LM2678 series of regulators are monolithic integrated
circuits which provide all of the active functions for a
step-down (buck) switching regulator capable of driving up to
5A loads with excellent line and load regulation characteris-
tics. High efficiency (>90%) is obtained through the use of a
low ON-resistance DMOS power switch. The series consists
of fixed output voltages of 3.3V, 5V and 12V and an adjust-
able output version.
The SIMPLE SWITCHER concept provides for a complete
design using a minimum number of external components. A
high fixed frequency oscillator (260KHz) allows the use of
physically smaller sized components. A family of standard in-
ductors for use with the LM2678 are available from several
manufacturers to greatly simplify the design process.
The LM2678 series also has built in thermal shutdown, cur-
rent limiting and an ON/OFF control input that can power
down the regulator to a low 50µA quiescent current standby
condition. The output voltage is guaranteed to a ±2% toler-
ance. The clock frequency is controlled to within a ±11% tol-
erance.
Features
n
Efficiency up to 92%
n
Simple and easy to design with (using off-the-shelf
external components)
n
120 m
Ω DMOS output switch
n
3.3V, 5V and 12V fixed output and adjustable (1.2V to
37V ) versions
n
50µA standby current when switched OFF
n ±
2%maximum output tolerance over full line and load
conditions
n
Wide input voltage range: 8V to 40V
n
260 KHz fixed frequency internal oscillator
n
−40 to +125˚C operating junction temperature range
Applications
n
Simple to design, high efficiency (>90%) step-down
switching regulators
n
Efficient system pre-regulator for linear voltage
regulators
n
Battery chargers
Typical Application
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation.
DS100886-3
March 2000
© 2000 National Semiconductor Corporation
DS100886
www.national.com




Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23 


Datasheet Download



Related Electronics Part Number

Part NumberComponents DescriptionHtml ViewManufacturer
LM2676SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator 1 2 3 4 5 MoreNational Semiconductor (TI)
LM2677SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator with Sync 1 2 3 4 5 MoreNational Semiconductor (TI)
LM2678SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator 1 2 3 4 5 MoreNational Semiconductor (TI)
LM2670SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync 1 2 3 4 5 MoreNational Semiconductor (TI)
LM2671SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage Regulator with Features 1 2 3 4 5 MoreNational Semiconductor (TI)
LM2672SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator with Features 1 2 3 4 5 MoreNational Semiconductor (TI)
LM2674SIMPLE SWITCHER Power Converter High Efficiency 500 mA Step-Down Voltage Regulator 1 2 3 4 5 MoreNational Semiconductor (TI)
LM2675SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator 1 2 3 4 5 MoreNational Semiconductor (TI)
LM2673SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit 1 2 3 4 5 MoreNational Semiconductor (TI)
LM2590HVSIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator with Features 1 2 3 4 5 MoreNational Semiconductor (TI)

Link URL

Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Bookmark   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com 2003 - 2017    


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl