R physically close to device cathode

S

C

physically close to device

IN

C

physically close to device

OUT

LM431

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SNVS020H – MAY 2000 – REVISED JANUARY 2016

10 Power Supply Recommendations

While a bypass capacitor is not required on the input voltage line, TI recommends reducing noise on the input

which could affect the output. TI recommends a 0.1-µF ceramic capacitor or larger.

11 Layout

11.1 Layout Guidelines

Place external components as close to the device as possible. Place RS close to the cathode, as well as the

input bypass capacitor, if used. Keep feedback resistor close the device whenever possible.

11.2 Layout Example

Figure 26. LM431 Layout Recommendation

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