CATHODE

1

NC

2

NC

3

4

8

7

NC

6

ANODE

5

NC

Rsup

Vsup

GND

NC

NC

GND

11

LM285-2.5, LM385-2.5, LM385B-2.5

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SLVS023K – JANUARY 1989 – REVISED MARCH 2016

Product Folder Links: LM285-2.5 LM385-2.5 LM385B-2.5

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Copyright © 1989–2016, Texas Instruments Incorporated

9 Power Supply Recommendations

The supply voltage should be current limited to ensure that the maximum cathode current is not exceeded.

For applications shunting high currents (30 mA maximum), pay attention to the cathode and anode trace lengths,

and adjust the width of the traces to have the proper current density.

10 Layout

10.1 Layout Guidelines

•

It is optional to connect a low-ESR, 0.1-

•

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.

10.2 Layout Example

Figure 12. Layout Diagram