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LM285DR-1-2 Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza LM285DR-1-2
Descripción Electrónicos  Micropower Voltage References
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LM285DR-1-2 Datasheet(HTML) 11 Page - Texas Instruments

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CATHODE
1
NC
2
NC
3
4
8
7
NC
6
ANODE
5
NC
Rsup
Vsup
CL
GND
NC
NC
GND
LM285-1.2, LM385-1.2, LM385B-1.2
www.ti.com
SLVS075J – APRIL 1989 – REVISED JANUARY 2015
10 Power Supply Recommendations
In order to not exceed the maximum cathode current, be sure that the supply voltage is current limited.
For applications shunting high currents (30 mA max), pay attention to the cathode and anode trace lengths,
adjusting the width of the traces to have the proper current density.
11 Layout
11.1 Layout Guidelines
Figure 12 shows an example of a PCB layout of LMx85x-1.2. Some key Vref niose considerations are:
Connect a low-ESR, 0.1-
μF (CL) ceramic bypass capacitor on the cathode pin node.
Decouple other active devices in the system per the device specifications.
Using a solid ground plane helps distribute heat and reduces electromagnetic interference (EMI) noise pickup.
Place the external components as close to the device as possible. This configuration prevents parasitic errors
(such as the Seebeck effect) from occurring.
Do not run sensitive analog traces in parallel with digital traces. Avoid crossing digital and analog traces if
possible and only make perpendicular crossings when absolutely necessary.
11.2 Layout Example
Figure 12. Layout Diagram
Copyright © 1989–2015, Texas Instruments Incorporated
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11
Product Folder Links: LM285-1.2 LM385-1.2 LM385B-1.2


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