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| 型号： | LP2980AIM5-4.7 |
| 厂商： | National Semiconductor |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 4.7V 50MA SOT23-5 |
| 标准包装： | 1,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 4.7V |
| 输入电压： | 最高 16V |
| 电压 - 压降（标准）： | 0.12V @ 50mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 50mA |
| 电流 - 限制（最小）： | 100mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23 |
| 包装： | 带卷 (TR) |
| 其它名称： | *LP2980AIM5-4.7 |
SNOS733M – APRIL 2000 – REVISED JUNE 2013
Figure 41. 5V to 3.3V @ 3A Converter
With limited input voltage range, the LP2980-N can control a 3.3V, 3A regulator with the use of a high current-
gain external PNP pass transistor as shown in Figure 41 . If the regulator is to be loaded with the full 3A, heat
sinking will be required on the pass transistor to keep it within its rated temperature range. Refer to Figure 42 .
For best load regulation at the high load current, the LP2980-N output voltage connection should be made as
close to the load as possible.
Although this regulator can handle a much higher load current than can the LP2980-N alone, it can be shut down
in the same manner as the LP2980-N. When the ON/OFF control is brought low, the converter will be in
shutdown, and will draw less than 1 μ A from the source.
Notes:
1. Drive this input with a logic signal (see APPLICATION HINTS ). If the shutdown function is not to be used, tie
the ON/OFF pin directly to the V IN pin.
2. Capacitor is required for regulator stability. Minimum size is shown, and may be increased without limit.
3. Increasing the output capacitance improves transient response and increases phase margin.
4. A heatsink may be required for this transistor. The maximum allowable value for thermal resistance of the
heatsink is dependent on ambient temperature and load current (see curves in Figure 42 ). Once the value is
obtained from the graph, a heatsink must be selected which has a thermal resistance equal to or lower than
this value. If the value is above 60°C/W, no heatsink is required (the TO-220 package alone will safely
dissipate this).
For these curves, a maximum junction temperature of 150°C is assumed for the pass transistor. The case-to-
heatsink attachment thermal resistance is assumed to be 1.5°C/W. All calculations are for 5.5V input voltage
(which is worst-case for power dissipation).
14
Product Folder Links: LP2980-N
Copyright ? 2000–2013, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LP2980AIM5-5.0 | 功能描述:低压差稳压器 - LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| LP2980AIM5-5.0 | 制造商:Texas Instruments 功能描述:V REG LDO +5.0V SMD 2980 SOT235 |
| LP2980AIM5-5.0/NOPB | 功能描述:低压差稳压器 - LDO Micropower 50 mA Ultra LDO Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| LP2980AIM5X-1.8 | 制造商:Rochester Electronics LLC 功能描述:50MA 1.8V SOT UPWR ULTRA LDO - Bulk 制造商:Texas Instruments 功能描述: |
| LP2980AIM5X-1.8/NOPB | 功能描述:IC REG LDO 1.8V 50MA SOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:4V 输入电压:最高 16V 电压 - 压降（标准）:0.28V @ 150mA 稳压器数量:1 电流 - 输出:150mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:5-VFBGA 供应商设备封装:5-uSMD 包装:Digi-Reel® 其它名称:LP2985AIBP-4.0DKR |
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