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參數(shù)資料
| 型號： | LM26480SQX-BF/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.4 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, QCC24 |
| 封裝： | 4 X 4 MM, 0.80 MM HEIGHT, LLP-24 |
| 文件頁數(shù)： | 16/30頁 |
| 文件大?。?/td> | 2447K |
| 代理商： | LM26480SQX-BF/NOPB |
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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 m.
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 F 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 F 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
LM26480
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PDF描述 |
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| LM2661M/NOPB | SWITCHED CAPACITOR CONVERTER, 80 kHz SWITCHING FREQ-MAX, PDSO8 |
| LM2660MMX/NOPB | SWITCHED CAPACITOR CONVERTER, 40 kHz SWITCHING FREQ-MAX, PDSO8 |
| LM2661MM/NOPB | SWITCHED CAPACITOR CONVERTER, 80 kHz SWITCHING FREQ-MAX, PDSO8 |
| LM2661MMX/NOPB | SWITCHED CAPACITOR CONVERTER, 80 kHz SWITCHING FREQ-MAX, PDSO8 |
| LM2661MX/NOPB | SWITCHED CAPACITOR CONVERTER, 80 kHz SWITCHING FREQ-MAX, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM26484 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Power Management Unit |
| LM26484SQ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Power Management Unit |
| LM26484SQ/NOPB | 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| LM26484SQE | 制造商:Texas Instruments 功能描述:Power Management Unit 24-Pin LLP EP T/R 制造商:Texas Instruments 功能描述:PMU MULTI FUNCTN PRINTERS 24LLP |
| LM26484SQE/NOPB | 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
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