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Programmable DC 2 DC convert circuit

I’m currently designing DC to DC convert for a test system. The input voltage is 5V power supply code and output needs programmable (for example, via I2C) from 3.0V ~ 3.5V with maximum ramp < 50mV and over current protection (1 ~ 2 A). We prefer to use LDO in the system.  Is there good recommended IC and circuits?