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LM2679: Output capacitor and Css

Part Number: LM2679
Other Parts Discussed in Thread: LM2671

Hi Team,

I have two question about the capacitor at output and Soft-start pin.

1.output capacitor

  Can we use this device only the ceramic capacitor without the capacitor of large ESR for output capacitor?

  This device looks the voltage mode regulator. And there is only a Tantalum capacitor for the output capacitor at the typical application circuit.

  So that, I am considering whether we need more high ESR cap in parallel of ceramic capacitor.  

2. soft-start capacitor

  On the datasheet it's mentioned Css need to avoid between 0.033uF to 1uF. Why do we need to avoid that capacitor value?  Is it possible over 1uF?

>>>With larger loads or lower input voltages during start-up this effect is minimized. In particular, avoid using soft-start capacitors between 0.033 µF and 1 µF.

Best Regards,

Koji Hamamoto