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Strange problem with L5793D switching regulator

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blapcb

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I am designing a circuit with a L5973D switching regulator to provide 3.8v and am facing a peculiar problem. The circuit is as per the design reference in the datasheet and the feedback resistors are given to provide 3.8v output (10K and 4.7K). Initially, I get 3.8v. But while leaving the circuit connected, it starts inching up about 10mV every 10 minutes or so. Furthermore, powering down the circuit and then back up does not cause it to provide 3.8v again. Wondering what's going on....

(circuit attached)
 

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It is tricky to find the datasheet - I think it is obsolete. Anyway, I am surprised it works at all - C51 should be 220pF not 220uF.

Keith.
 

Is it triggered by OTP (Over Temperature Protection)?
 

In which case I would look for thermal effects. Is it getting hot? Does the voltage recover if it is turned off for a while?

Keith
 

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