LP2996A Datasheet, PDF (18/29 Pages) Texas Instruments – DDR Termination Regulator

LP2996A
SNOSCY7 – JUNE 2014
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9 Power Supply Recommendations
There are several recommendations for the LP2996A input power supply. An input capacitor is not required but is
recommended for improved performance during large load transients to prevent the input rail from dropping. The
input capacitor should be located as close as possible to the PVIN pin. Several recommendations exist
dependent on the application required. A typical value recommended for AL electrolytic capacitors is 50 µF.
Ceramic capacitors can also be used, a value in the range of 10 µF with X5R or better would be an ideal choice.
The input capacitance can be reduced if the LP2996A is placed close to the bulk capacitance from the output of
the 2.5 V DC-DC converter. If the two supply rails (AVIN and PVIN) are separated then the 47 uF capacitor
should be placed as close to possible to the PVIN rail. An additional 0.1 uF ceramic capacitor can be placed on
the AVIN rail to prevent excessive noise from coupling into the device.
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