LT1117 具可调和固定 2.85V、3.3V、5V 输出的 800mA 低压差正稳压器
LT®1117 是一款正低压差稳压器，专为提供高达 800mA 的输出电流而设计。该器件可提供一种可调输出电压版本和固定输出电压版本 (2.85V、3.3V 和 5V)。2.85V 版本是为在 SCSI 总线的有源终端器中使用而特别设计。所有的内部电路均专为在低至 1V 的输入至输出差分电压条件下运作而设计。在 800mA 电流条件下，压差电压保证处于 1.2V 的最大值，并随着负载电流的下降而减小。片内修整将基准/输出电压调节至 ±1% 以内。对电流限值也进行了修整，以最大限度地减小过载情况下稳压器和电源电路上所承受的应力。
该器件采用扁平的表面贴装型 SOT-223 封装，因而可在那些空间受限的应用中使用。LT1117 需要一个最小 10μF 的输出电容以实现稳定性。大多数稳压器设计中都采用了具有该数值或更大数值的输出电容器。
PNP 型稳压器会有多达 10% 的输出电流被作为静态电流而浪费掉，LT1117 则与之不同，该器件的静态电流将流入负载，从而提升了效率。
产品特点 Features
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应用
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LT1117 订购信息和价格参考Package Variations and Pricing
| 器件型号 | 封装 | 引脚 | 温度 | 价格 (以 1 ~ 99 片为批量) | 价格 (以 1000 片为批量) * |
| LT1117CM | DD PAK | 3 | C | $2.58 | $2.10 |
| LT1117CM#PBF | DD PAK | 3 | C | $2.58 | $2.10 |
| LT1117CM#TR | DD PAK | 3 | C | $2.23 | |
| LT1117CM#TRPBF | DD PAK | 3 | C | $2.23 | |
| LT1117CM-2.85 | DD PAK | 3 | C | $2.58 | $2.10 |
| LT1117CM-2.85#PBF | DD PAK | 3 | C | $2.58 | $2.10 |
| LT1117CM-2.85#TR | DD PAK | 3 | C | $2.22 | |
| LT1117CM-2.85#TRPBF | DD PAK | 3 | C | $2.22 | |
| LT1117CM-3.3 | DD PAK | 3 | C | $2.58 | $2.10 |
| LT1117CM-3.3#PBF | DD PAK | 3 | C | $2.58 | $2.10 |
| LT1117CM-3.3#TR | DD PAK | 3 | C | $2.23 | |
| LT1117CM-3.3#TRPBF | DD PAK | 3 | C | $2.23 | |
| LT1117CM-5 | DD PAK | 3 | C | $2.58 | $2.10 |
| LT1117CM-5#PBF | DD PAK | 3 | C | $2.58 | $2.10 |
| LT1117CM-5#TR | DD PAK | 3 | C | $2.23 | |
| LT1117CM-5#TRPBF | DD PAK | 3 | C | $2.23 | |
| LT1117CST | SOT | 3 | C | $2.42 | $1.90 |
| LT1117CST#PBF | SOT | 4 | C | $2.42 | $1.90 |
| LT1117CST#TR | SOT | 4 | C | $1.96 | |
| LT1117CST#TRPBF | SOT | 3 | C | $1.96 | |
| LT1117CST-2.85 | SOT | 3 | C | $2.42 | $1.90 |
| LT1117CST-2.85#PBF | SOT | 3 | C | $2.42 | $1.90 |
| LT1117CST-2.85#TR | SOT | 3 | C | $1.96 | |
| LT1117CST-2.85#TRPBF | SOT | 3 | C | $1.96 | |
| LT1117CST-3.3 | SOT | 3 | C | $2.42 | $1.90 |
| LT1117CST-3.3#PBF | SOT | 3 | C | $2.42 | $1.90 |
| LT1117CST-3.3#TR | SOT | 3 | C | $1.96 | |
| LT1117CST-3.3#TRPBF | SOT | 3 | C | $1.96 | |
| LT1117CST-5 | SOT | 3 | C | $2.42 | $1.90 |
| LT1117CST-5#PBF | SOT | 3 | C | $2.42 | $1.90 |
| LT1117CST-5#TR | SOT | 3 | C | $1.96 | |
| LT1117CST-5#TRPBF | SOT | 3 | C | $1.96 | |
| LT1117IST | SOT | 3 | I | $2.52 | $2.20 |
| LT1117IST#PBF | SOT | 3 | I | $2.52 | $2.20 |
| LT1117IST#TR | SOT | 3 | I | $2.26 | |
| LT1117IST#TRPBF | SOT | 3 | I | $2.26 | |
| LT1117IST-2.85 | SOT | 3 | I | $2.52 | $2.20 |
| LT1117IST-2.85#PBF | SOT | 3 | I | $2.52 | $2.20 |
| LT1117IST-2.85#TR | SOT | 3 | I | $2.26 | |
| LT1117IST-2.85#TRPBF | SOT | 3 | I | $2.26 | |
| LT1117IST-3.3 | SOT | 3 | I | $2.52 | $2.20 |
| LT1117IST-3.3#PBF | SOT | 3 | I | $2.52 | $2.20 |
| LT1117IST-3.3#TR | SOT | 3 | I | $2.26 | |
| LT1117IST-3.3#TRPBF | SOT | 3 | I | $2.26 | |
| LT1117IST-5 | SOT | 3 | I | $2.52 | $2.20 |
| LT1117IST-5#PBF | SOT | 3 | I | $2.52 | $2.20 |
| LT1117IST-5#TR | SOT | 3 | I | $2.26 | |
| LT1117IST-5#TRPBF | SOT | 3 | I | $2.26 |
演示电路板
| 器件型号 | 描述 |
| DC1401A | LT1117EDCB Demo Board | Adjustable 500mA Single Resistor Low Dropout Regulator |
LT1117 数据手册及相关资料下载
- 数据手册(英文) : LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 - 800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V,3.3V, 5V.PDF
- 应用指南 (英文) : AN52 - linear Technology Magazine Circuit Collection, Volume 1.PDF
- 应用指南 (英文) : AN58 - 5V to 3.3V Converters for Microprocessor Systems.PDF
- 设计要点 (英文) : DN34 - Active Termination for SCSI-2 Bus.PDF
- 设计要点 (英文) : DN74 - Techniques for Deriving 3.3V from 5V Supplies.PDF
- 设计要点 (英文) : DN82 - 5V to 3.3V Regulator with Fail-Safe Switchover.PDF
- 可靠性数据 : R162 Reliability Data .PDF
