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LM4040CIM3-2.0 Datasheet(PDF) 33 Page - Texas Instruments

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Part No. LM4040CIM3-2.0
Description  LM4040-N/-Q1 Precision Micropower Shunt Voltage Reference
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM4040CIM3-2.0 Datasheet(HTML) 33 Page - Texas Instruments

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33
LM4040-N, LM4040-N-Q1
www.ti.com
SNOS633K – OCTOBER 2000 – REVISED JUNE 2016
Product Folder Links: LM4040-N LM4040-N-Q1
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Copyright © 2000–2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The LM4040 device is a precision micropower shunt voltage reference available in 7 different fixed-output
voltage options and three different packages to meet small footprint requirements. The part is also available in
five different tolerance grades.
8.2 Functional Block Diagram
8.3 Feature Description
The LM4040 device is effectively a precision Zener diode. The part requires a small quiescent current for
regulation, and regulates the output voltage by shunting more or less current to ground, depending on input
voltage and load. The only external component requirement is a resistor between the cathode and the input
voltage to set the input current. An external capacitor can be used on the input or output, but is not required.
8.4 Device Functional Modes
The LM4040 device is a fixed output voltage part, where the feedback is internal. Therefore, the part can only
operate is a closed loop mode and the output voltage cannot be adjusted. The output voltage will remain in
regulation as long as IR is between IRMIN, see Electrical Characteristics: 2-V LM4040-N VR Tolerance Grades 'A'
And 'B'; Temperature Grade 'I', and IRMAX, 15 mA. Proper selection of the external resistor for input voltage range
and load current range will ensure these conditions are met.


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