LM4140

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SNVS053E – JUNE 2000 – REVISED APRIL 2013

APPLICATION HINTS

INPUT CAPACITORS

Although not always required, an input capacitor is recommended. A supply bypass capacitor on the input

assures that the reference is working from a source with low impedance, which improves stability. A bypass

capacitor can also improve transient response by providing a reservoir of stored energy that the reference can

limit. Refer to the Typical Application section for examples of input capacitors.

OUTPUT CAPACITORS

The LM4140 requires a 1

μF (nominally) output capacitor for loop stability (compensation) as well as transient

response. During the sudden changes in load current demand, the output capacitor must source or sink current

during the time it takes the control loop of the LM4140 to respond.

This capacitor must be selected to meet the requirements of minimum capacitance and equivalent series

resistance (ESR) range.

In general, the capacitor value must be at least 0.2

μF (over the actual ambient operating temperature), and the

ESR must be within the range indicated in Figure 24, Figure 25 and Figure 26.

Figure 24. 0.22

μF ESR Range

Figure 25. 1

μF ESR Range

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