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Regarding output fluctuations with and without load

Category: Hardware
Product Number: LTM4677

LTM4677 IC have problem with output 

LTM4677 is programmed for 0.9v output voltage.

Enable signal is coming 3.3VDC continuously.

For programming of IC used resistors, not programmed using I2C

When no load is connected to power regulator output we are receiving sawtooth wave, maximum voltage 0.9VDC and continuously reducing to 0.8VDC

When load(6 ohm) is connected to power regulator output we are receiving discontinue operation, maximum voltage 0.9VDC and continuously reducing to 0V.

Because of discontinued operations of power regulator we are not able to power on stratix x.

Please help to get continue 0.9VDC