Electronic Components Datasheet Search
Selected language     English  ▼
Part Name
         Description


LM2670 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM2670
Description  SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync
Download  26 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo 

 
 1 page
background image
LM2670
SIMPLE SWITCHER® High Efficiency 3A Step-Down
Voltage Regulator with Sync
General Description
The LM2670 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 3A
loads with excellent line and load regulation characteristics.
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 adjustable
output version.
The SIMPLE SWITCHER concept provides for a complete
design using a minimum number of external components.
The switching clock frequency can be provided by an inter-
nal fixed frequency oscillator (260KHz) or from an externally
provided clock in the range of 280KHz to 400Khz which
allows the use of physically smaller sized components. A
family of standard inductors for use with the LM2670 are
available from several manufacturers to greatly simplify the
design process. The external Sync clock provides direct and
precise control of the output ripple frequency for consistent
filtering or frequency spectrum positioning.
The LM2670 series also has built in thermal shutdown,
current 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.
Features
n
Efficiency up to 94%
n
Simple and easy to design with (using off-the-shelf
external components)
n
150 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
External Sync clock capability (280KHz to 400KHz)
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
n
Communications and radio equipment regulator with
synchronized clock frequency
Typical Application
10094203
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation.
October 2003
© 2003 National Semiconductor Corporation
DS100942
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  24  25  26 


Datasheet Download



Related Electronics Part Number

Part NumberComponents DescriptionHtml ViewManufacturer
LM2677SIMPLE SWITCHER High Efficiency 5A 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)
LM2678SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator 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)
LM2676SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator 1 2 3 4 5 MoreNational Semiconductor (TI)
LM2678S-12SIMPLE SWITCHER High Efficiency 5A 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