Datasheet

LM2940-N, LM2940C
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SNVS769H MAY 2004REVISED MARCH 2007
Equivalent Schematic Diagram
Application Information
EXTERNAL CAPACITORS
The output capacitor is critical to maintaining regulator stability, and must meet the required conditions for both
ESR (Equivalent Series Resistance) and minimum amount of capacitance.
MINIMUM CAPACITANCE:
The minimum output capacitance required to maintain stability is 22 μF (this value may be increased without
limit). Larger values of output capacitance will give improved transient response.
ESR LIMITS:
The ESR of the output capacitor will cause loop instability if it is too high or too low. The acceptable range of
ESR plotted versus load current is shown in the graph below. It is essential that the output capacitor meet
these requirements, or oscillations can result.
Figure 8. Output Capacitor ESR Limits
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Product Folder Links: LM2940-N LM2940C