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LM285LPR-2-5 Datasheet(PDF) 9 Page - Texas Instruments

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Part # LM285LPR-2-5
Description  Micropower Voltage References
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM285LPR-2-5 Datasheet(HTML) 9 Page - Texas Instruments

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VI
t − Time − µs
0
100
500
600
0
5
0
1
2
3
VO
24 kΩ
Output
4
Input
LM385-2.5
221 k
9 V
2.5 V
9
LM285-2.5, LM385-2.5, LM385B-2.5
www.ti.com
SLVS023K – JANUARY 1989 – REVISED MARCH 2016
Product Folder Links: LM285-2.5 LM385-2.5 LM385B-2.5
Submit Documentation Feedback
Copyright © 1989–2016, Texas Instruments Incorporated
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LMx85-2.5 and LM385B-2.5 devices create a voltage reference for use in a variety of applications including
amplifiers, power supplies, and current-sensing circuits.
8.2 Typical Application
Figure 8 shows how to use these devices to establish a 2.5-V source from a 9-V battery.
Figure 8. Reference From a 9-V Battery
8.2.1 Design Requirements
The key design requirement when using this device as a voltage reference is to supply the LM385 with a
minimum Cathode Current (IZ), as indicated in Electrical Characteristics.
8.2.2 Detailed Design Procedure
To generate a constant and stable reference voltage, a current greater than IZ(MIN) must be sourced into the
cathode of this device. This can be accomplished using a current regulating device such as LM334 or a simple
resistor. For a resistor, its value should be equal to or greater than (Vsupply - Vreference) ÷ IZ(MIN) .
8.2.3 Application Curve
Figure 9. Device Transient Response


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