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后一修订版 		前一修订版
lt1117 [2016/06/02 15:28]
admin 创建 		lt1117 [2019/04/16 15:28] (当前版本)
gongyu
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-800mA Low Dropout +LT1117为[ADI/​Linear Technology](http://​www.analog.com)公司的一款经典[[LDO]]芯片，其它公司如TI、On、AMS等也都有类似功能、同样编号的器件（LM1117、AMS1117等）. 
-Positive Regulators Adjustable +====主要技术指标：==== 
-and Fixed 2.85V, 3.3V, 5V+  * 800mA输出电流 
 +  * 低压差 － 1.2V@800mA，负载电流越小，压差越低 
 +  * 有两种版本： 
 +    * 可调输出 
 +    * 固定2.85V, 3.3V, 5V输出电压 
 +  * 采用SOT－223小封装 
 +  * 为使输出稳定，在输出端需要最小10μF的电容
  
-The LT®1117 is a positive low dropout regulator designed +{{ :​lt1117application.png |}} 
-to provide up to 800mA of output current. The device is +<WRAP centeralign>​ LT1117的应用框图 </WRAP>
-available in an adjustable version and fixed output voltages +
-of 2.85V, 3.3V and 5V. The 2.85V version is designed +
-specifically to be used in Active Terminators for the SCSI +
-bus. All internal circuitry is designed to operate down to 1V +
-input to output differential. Dropout voltage is guaranteed +
-at a maximum of 1.2V at 800mA, decreasing at lower load +
-currents. On chip trimming adjusts the reference/output +
-voltage to within ±1%. Current limit is also trimmed in +
-order to minimize the stress on both the regulator and the +
-power source circuitry under overload conditions. +
-The low profi le surface mount SOT-223 package allows the +
-device to be used in applications where space is limited. The +
-LT1117 requires a minimum of 10μF of output capacitance +
-for stability. Output capacitors of this size or larger are +
-normally included in most regulator designs. +
-Unlike PNP type regulators where up to 10% of the output +
-current is wasted as quiescent current, the quiescent current +
-of the LT1117 fl ows into the load, increasing efficiency+
  
 +{{ :​sot223_drawing.png |}}
 +<WRAP centeralign>​SOT－223封装信息 </​WRAP>​
  
- Space Saving SOT-223 Surface Mount Package +{{ :​1117supplier.png |}} 
-n 3-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V +<WRAP centeralign>​ 生产1117器件的厂商 </​WRAP>​
-n Output Current of 800mA +
-n Operates Down to 1V Dropout +
-n Guaranteed Dropout Voltage at Multiple Current Levels +
-n 0.2% Line Regulation Max +
-n 0.4% Load Regulation Max+
  
- +====技术资料==== 
- +  ​* ​{{:​lt1117fd.pdf|LT1117数据手册}}
-{{:​lt1117fd.pdf|LT1117数据手册}}+