Electronic Components Datasheet Search
  English  ▼

X  

Preview PDF HTML

LM26480 Datasheet(PDF) 23 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM26480
Description  Externally Programmable Dual High-Current Step-Down DC/DC and Dual Linear Regulators
PDF  30 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM26480 Datasheet(HTML) 23 Page - National Semiconductor (TI)

Back Button LM26480 Datasheet HTML 19Page - National Semiconductor (TI) LM26480 Datasheet HTML 20Page - National Semiconductor (TI) LM26480 Datasheet HTML 21Page - National Semiconductor (TI) LM26480 Datasheet HTML 22Page - National Semiconductor (TI) LM26480 Datasheet HTML 23Page - National Semiconductor (TI) LM26480 Datasheet HTML 24Page - National Semiconductor (TI) LM26480 Datasheet HTML 25Page - National Semiconductor (TI) LM26480 Datasheet HTML 26Page - National Semiconductor (TI) LM26480 Datasheet HTML 27Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 23 / 30 page
background image
INPUT CAPACITOR SELECTION FOR SW1 AND SW2
It is required to use a ceramic input capacitor of at least 4.7
μF and 6.3V with an ESR of under 10 mΩ.
The input power source supplies average current continu-
ously. During the PFET switch on-time, however, the de-
manded di/dt is higher than can be typically supplied by the
input power source. This delta is supplied by the input capac-
itor.
A simplified “worst case” assumption is that all of the PFET
current is supplied by the input capacitor. This will result in
conservative estimates of input ripple voltage and capacitor
RMS current. Input ripple voltage is estimated as follows:
V
PPIN:
Estimated peak-to-peak input ripple voltage
I
OUT:
Output current, Amps
C
IN:
Input capacitor value, Farads
ESR
IN:
Input capacitor ESR, Ohms
This capacitor is exposed to significant RMS current, so it is
important to select a capacitor with an adequate RMS current
rating. Capacitor RMS current estimated as follows:
I
RSCIN
Estimated input capacitor RMS current
Model
Type
Vendor
Voltage Rating
Case Size
4.7 µF for CIN
C2012X5R0J475K
Ceramic, X5R
TDK
6.3V
0805, (2012)
JMK212BJ475K
Ceramic, X5R
Taiyo-Yuden
6.3V
0805, (2012)
GRM21BR60J475K
Ceramic, X5R
Murata
6.3V
0805, (2012)
C1608X5R0J475K
Ceramic, X5R
TDK
6.3V
0603, (1608)
10 µF for COUT
GRM21BR60J106K
Ceramic, X5R
Murata
6.3V
0805, (2012)
JMK212BJ106K
Ceramic, X5R
Taiyo-Yuden
6.3V
0805, (2012)
C2012X5R0J106K
Ceramic, X5R
TDK
6.3V
0805, (2012)
C1608X5R0J106K
Ceramic, X5R
TDK
6.3V
0603, (1608)
23
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 27 28 29 30


Datasheet Download

Go To PDF Page


Link URL



Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link to Datasheet    |   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