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Micrel MIC2876-AYMT-T5 regulator problem

 

 

I am using the Micrel MIC2876-AYMT-T5 regulator on my new board. Unfortunately it is not working correctly.

I need 5Vout for 3-4 Vin and load current up to 2.5A. But the output voltage is stable only for 3.7-4 Vin. For Vin < 3.7V the output voltage starts oscillating and drops gradually.

Also interesting to note is that if the regulator powers-on while Vin > 3.7V and only then I reduced the voltage gradually bellow 3.7V, the output remains stable.

 

Can you suggest what could be the reasons for this behavior?

 

 

Thanks,

 

 

Shimshon

 

 

 

 

 

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