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LM1117DTX-2.5 Datasheet(PDF) 11 Page - Texas Instruments

Part # LM1117DTX-2.5
Description  800-mA Low-Dropout Linear Regulator
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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LM1117DTX-2.5 Datasheet(HTML) 11 Page - Texas Instruments

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LM1117
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SNOS412N – FEBRUARY 2000 – REVISED JANUARY 2016
7 Detailed Description
7.1 Overview
The LM1117 adjustable version develops a 1.25V reference voltage, VREF, between the output and the adjust
terminal. As shown in Figure 10, this voltage is applied across resistor R1 to generate a constant current I1. The
current IADJ from the adjust terminal could introduce error to the output. But since it is very small (60µA)
compared with the I1 and very constant with line and load changes, the error can be ignored. The constant
current I1 then flows through the output set resistor R2 and sets the output voltage to the desired level.
For fixed voltage devices, R1 and R2 are integrated inside the devices.
Figure 10. Basic Adjustable Regulator
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Load Regulation
The LM1117 regulates the voltage that appears between its output and ground pins, or between its output and
adjust pins. In some cases, line resistances can introduce errors to the voltage across the load. To obtain the
best load regulation, a few precautions are needed.
Copyright © 2000–2016, Texas Instruments Incorporated
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