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參數資料
| 型號： | LM26480QSQ-CF/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.4 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, QCC24 |
| 封裝： | 4 X 4 MM, 0.80 MM HEIGHT, ROHS COMPLIANT, LLP-24 |
| 文件頁數： | 21/30頁 |
| 文件大?。?/td> | 2455K |
| 代理商： | LM26480QSQ-CF/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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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM26480QSQX-8D/NOPB | 制造商:Texas Instruments 功能描述:Externally Programmable Dual High-Curren |
| LM26480QSQX-AA/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LM26480QSQX-CF/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LM26480SQ-AA | 制造商:Texas Instruments 功能描述:DC/ DC STEP DOWN, DUAL LINEAR REG, IC |
| LM26480SQ-AA/NOPB | 功能描述:線性穩(wěn)壓器 - 標準 DUAL HI-CRNT STEP- DOWN DC/DC RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調節(jié): 最大輸入電壓:5.5 V 線路調整率: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
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