 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LT3479EDE Datasheet(PDF) 8 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LT3479EDE Datasheet(HTML) 8 Page - Linear Technology |
|
|
8 / 20 page  LT3479 8 3479fb Capacitor Selection Low ESR (equivalent series resistance) ceramic capaci- tors should be used at the output to minimize the output ripple voltage. Use only X5R or X7R dielectrics, as these materials retain their capacitance over wider voltage and temperature ranges better than other dielectrics. A 4.7μF to 10μF output capacitor is sufficient for most high output current designs. Converters with lower output currents may need only a 1μF or 2.2μF output capacitor. Table 1. Ceramic Capacitor Manufacturers MANUFACTURER PHONE WEB Taiyo Yuden (408) 573-4150 www.t-yuden.com AVX (803) 448-9411 www.avxcorp.com Murata (714) 852-2001 www.murata.com Inductor Selection Several inductors that work well with the LT3479 are listed in Table 2. However, there are many other manufacturers and devices that can be used. Consult each manufacturer for more detailed information and their entire range of parts. Ferrite core inductors should be used to obtain the best efficiency. Choose an inductor that can handle the necessary peak current without saturating, and ensure that the inductor has a low DCR (copper-wire resistance) to minimize I2R power losses. A 4.7μH or 10μH inductor will suffice for most LT3479 applications. Inductor manufacturers specify the maximum current rating as the current where the inductance falls to some percentage of its nominal value—typically 65%. An inductor APPLICATIONS INFORMATION Table 2. Suggested Inductors MANUFACTURER PART NUMBER IDC (A) INDUCTANCE (μH) MAX DCR (mΩ) L × W × H (mm) MANUFACTURER CDRH6D283R0 CDRH6D28100 CDRH4D284R7 3 1.7 1.32 3 10 4.7 24 65 72 6.7 × 6.7 × 3.0 6.7 × 6.7 × 3.0 5.0 × 5.0 × 3.0 Sumida www.sumida.com LM N 05D B4R7M LM N 05D B100K 2.2 1.6 4.7 10 49 10 5.9 × 6.1 × 2.8 5.9 × 6.1 × 2.8 Taiyo Yuden www.t-yuden.com LQH55DN4R7M01L LQH55DN100M01K 2.7 1.7 4.7 10 57 130 5.7 × 5.0 × 4.7 5.7 × 5.0 × 4.7 Murata www.murata.com FDV0630-4R7M 4.2 4.7 49 7.0 × 7.7 × 3.0 Toko www.toko.com Figure 1. Efficiency vs Inductor Size IOUT (A) 0 70 80 0.8 3479 F01 60 50 0.2 0.4 0.6 90 65 75 55 85 SUMIDA CDRH4D28-4R7 TOKO FDV0630-4R7 can pass a current larger than its rated value without damaging it. Aggressive designs where board space is precious will exceed the maximum current rating of the inductor to save board space. Consult each manufacturer to determine how the maximum inductor current is measured and how much more current the inductor can reliably conduct. Physically larger inductors provide better efficiency than smaller ones. Figure 1 shows a 3% to 4% efficiency gain in using a larger inductor in a 1MHz, 5V to 12V application. The efficiency of the TOKO FDV0630-4R7M, which mea- sures 7mm × 7.7mm and 3 mm thick, peaks at 87%. The smaller Sumida CDRH4D28-4R7 which is 5mm ×5mmand 3mm thick yields a peak efficiency of 85% in an identical application. Thus, if board space is abundant, then larger inductors should be used to maximize efficiency. |
Similar Part No. - LT3479EDE |
|
Similar Description - LT3479EDE |
|
|
|
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 |
| 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
