Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

LX1910 Datasheet(PDF) 5 Page - Microsemi Corporation

Part # LX1910
Description  Step-Down Regulator
Download  8 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

LX1910 Datasheet(HTML) 5 Page - Microsemi Corporation

  LX1910 Datasheet HTML 1Page - Microsemi Corporation LX1910 Datasheet HTML 2Page - Microsemi Corporation LX1910 Datasheet HTML 3Page - Microsemi Corporation LX1910 Datasheet HTML 4Page - Microsemi Corporation LX1910 Datasheet HTML 5Page - Microsemi Corporation LX1910 Datasheet HTML 6Page - Microsemi Corporation LX1910 Datasheet HTML 7Page - Microsemi Corporation LX1910 Datasheet HTML 8Page - Microsemi Corporation  
Zoom Inzoom in Zoom Outzoom out
 5 / 8 page
background image
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
Copyright
© 2004
Rev. 1.1, 2005-02-25
LX1910
Step-Down Regulator
PRODUCTION DATA SHEET
TM
®
APPLI CATI ON NOTE
FUNCTIONAL DESCRIPTION
The LX1910 implements a PFM / PWM architecture
that improves power management efficiency across the
output load range.
OUTPUT VOLTAGE PROGRAMMING
Resistors R1 and R2 program the output voltage. An
optional capacitor CX may be inserted across R1 to improve
the transient response (see Figure 1). The value of R2
should be less than 100KΩ. The value of R1 can be
determined using the following equation, note VREF is also
referred to as VFBT.
1
V
V
R2
R1
REF
OUT
⎟⎟
⎜⎜
=
DESIGN EXAMPLE:
Let R2 equal 50K and the required VOUT equal to 3.0V.
78KΩ
1
50K
R1
1.17
3V
=
=
⎟⎟
⎜⎜
DIODE SELECTION
A Schottky diode is recommended for use with the
LX1910 because it provides fast switching and superior
reverse recovery performance. The Microsemi UPS5817
(20V @ 1A) makes an effective choice for most
applications.
INDUCTOR SELECTION
Selecting the appropriate inductor type and value ensures
optimal performance of the converter circuit for the
intended application. This selection process requires the
designer to make trade-offs between circuit performance
and cost. A primary consideration requires the selection of
an inductor that will not saturate at the peak current level.
Other considerations that affect inductor choice include
EMI, output voltage ripple, and overall circuit efficiency.
The inductor that works best depends upon the application’s
requirements. Further, some experimentation with actual
devices in-circuit is typically necessary to make the most
effective choice.
The LX1910 allows for a broad selection of inductor
values and choosing a value between 2.2µH and 30µH
supports a majority of applications.
Selecting a larger
inductor value can increase efficiency and reduce output
voltage ripple. Smaller inductors typically provide smaller
package size (critical in many portable applications) at the
expense of increasing output ripple current. Regardless of
inductor value, selecting a device manufactured with a
ferrite-core produces lower losses at higher switching
frequencies and thus better overall performance.
CAPACITOR SELECTION
To minimize ripple voltage, output capacitors with a low
series resistance (ESR) are recommended.
Multi-layer
ceramic capacitors with X5R or X7R dielectric make an
effective choice because they feature small size, very low
ESR, a temperature stable dielectric, and can be connected in
parallel to increase capacitance. Typical capacitance values
of 4.7 to 30µF have proven effective.
Other low ESR
capacitors such as solid tantalum, specialty polymer, or
organic semiconductor, make effective choices provided that
the capacitor is properly rated for the output voltage and
ripple current.
Finally, choose an input capacitor of
sufficient size to effectively decouple the input voltage
source impedance (e.g., CIN > 4.7µF).
LAYOUT CONSIDERATIONS
The high peak currents and switching frequencies present
in DC/DC converter applications require careful attention to
device layout for optimal performance. Basic design rules
include: (1) maintaining wide traces for power components
(e.g., width > 50mils); (2) place CIN, COUT, the Schottky
diode, and the inductor close to the LX1910; (3) minimizing
trace capacitance by reducing the etch area connecting the
SW pin to the inductor; and (4) minimizing the etch length to
the FB pin to reduce noise coupling into this high impedance
sense input. Other considerations include placing a 0.1uF
capacitor between the LX1910 VOUT pin and GND pin to
reduce high frequency noise and decoupling the VIN pin
using a 0.1µF capacitor.


Similar Part No. - LX1910

ManufacturerPart #DatasheetDescription
logo
Microsemi Corporation
LX1911 MICROSEMI-LX1911 Datasheet
152Kb / 7P
   1.5A, 1.1MHZ PWM Step-Down Regulator
LX1911CLD MICROSEMI-LX1911CLD Datasheet
152Kb / 7P
   1.5A, 1.1MHZ PWM Step-Down Regulator
LX1912 MICROSEMI-LX1912 Datasheet
143Kb / 8P
   VREF @ 800mV, 1.0A, 1.2MHz PWM Current Mode PWM Buck regulator
LX1912CSG MICROSEMI-LX1912CSG Datasheet
143Kb / 8P
   VREF @ 800mV, 1.0A, 1.2MHz PWM Current Mode PWM Buck regulator
LX1918 MICROSEMI-LX1918 Datasheet
243Kb / 9P
   1.8A Step-Down Synchronous Converter
More results

Similar Description - LX1910

ManufacturerPart #DatasheetDescription
logo
Texas Instruments
TPS53315 TI1-TPS53315_15 Datasheet
1Mb / 35P
[Old version datasheet]   Step-Down Regulator
logo
Linear Technology
LT1176 LINER-LT1176 Datasheet
178Kb / 4P
   Step-Down Switching Regulator
logo
Sanyo Semicon Device
LV58761MX SANYO-LV58761MX Datasheet
641Kb / 7P
   Step-down Switching Regulator
LV5807MX SANYO-LV5807MX Datasheet
206Kb / 5P
   Step-down Switching Regulator
logo
Linear Technology
LT1074 LINER-LT1074_15 Datasheet
190Kb / 16P
   Step-Down Switching Regulator
logo
ON Semiconductor
LV5980MD ONSEMI-LV5980MD Datasheet
718Kb / 20P
   Step-down Switching Regulator
October, 2013
LV5762QA ONSEMI-LV5762QA Datasheet
290Kb / 6P
   Step-down Switching Regulator
May, 2014
NCV8925 ONSEMI-NCV8925 Datasheet
172Kb / 14P
   Step-down Switching Regulator
April, 2008 - Rev. 0
logo
Sanyo Semicon Device
LV5809MX SANYO-LV5809MX Datasheet
120Kb / 5P
   Step-down Switching Regulator
logo
Bookly Micro electronic
BM1584 BOOKLY-BM1584 Datasheet
5Mb / 8P
   Synchronous Step-Down Regulator
More results


Html Pages

1 2 3 4 5 6 7 8


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

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


Mirror Sites
English : Alldatasheet.com  |   English : 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  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com