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参数资料
| 型号： | LM26480QSQX-CF/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.4 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, QCC24 |
| 封装： | 4 X 4 MM, 0.80 MM HEIGHT, ROHS COMPLIANT, LLP-24 |
| 文件页数： | 21/30页 |
| 文件大小： | 2455K |
| 代理商： | LM26480QSQX-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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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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:线性稳压器 - 标准 DUAL HI-CRNT STEP- DOWN DC/DC RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| LM26480SQ-AA/S7002404 | 制造商:Texas Instruments 功能描述: |
| LM26480SQ-AAEV | 功能描述:BOARD EVALUATION LM26480SQ-AA RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM26480SQ-AAEV/NOPB | 功能描述:电源管理IC开发工具 LM26480SQ-AAEV EVAL BOARD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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