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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)： | 21/30頁 |
| 文件大?。?/td> | 2447K |
| 代理商： | LM26480SQX-BF/NOPB |
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High VIN-High Load Operation
Additional inforamtion is provided when the IC is operated at
extremes of VIN and regulator loads. These are described in
terms of the junction temperature and buck output ripple man-
agement.
Junction Temperature
The maximum junction temperature T
J-MAX-OP of 125°C of the
IC package.
The following equations demonstrate junction temperature
determination, ambient temperature T
A-MAX and total chip
power ust be controlled to keep T
J below this maximum:
T
J-MAX-OP = TA-MAX + (θJA) [°C/Watt] * (PD-MAX) [Watts]
Total IC power dissipation P
D-MAX is the sum of the individual
power dissipation of the four regulators plus a minor amount
for chip overhead. Chip overhead is bias, TSD and LDO ana-
log.
P
D-MAX = PLOD1 + PLDO2 +PBUCK1 + PBUCK2 + (0.0001A
* VIN) [Watts].
Power dissipation of LDO1 (PLDO1) = (VINLDO1 VOUTL-
DO1) * IOUTLDO1 [V*A]
Power dissipation of LDO2 (PLDO2) = (VINLDO2 VOUTL-
DO2) * IOUTLDO2 [V*A]
Power dissipation of Buck1 (PBuck1) = POUT PIN = VOUT-
BUCK1 IOUTBUCK1 * (1
η2)/ η2 [V*A]
η1 = efficiency of Buck1
Power dissipation of Buck2 (PBuck2) = POUT PIN = VOUT-
BUCK2 IOUTBUCK2 * (1
η2)/ η2 [V*A]
η2 = efficiency of Buck2
Where
η is the efficiency for the specific condition is taken
from efficiency graphs.
If VIN and ILOADincrease, the output ripple associated with
the Buck Regulators also increases. This mainly occurs with
V
IN > 5.2V and a load current greater than 1.20A. To ensure
operation in this area of operation, it is recommended that the
system designer circumvents the output ripple issues by in-
stalling Schottky diodes on the bucks(s) that are expected to
perform under these extreme conditions.
www.national.com
28
LM26480
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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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