If the user changes the output voltage setpoint while the DC/DC converter is operating, the device ramps up or down to the new voltage setting in a controlled way.
The VRAMP[1:0] bits in the CONTROL1 register sets the slew rate when the device ramps from one voltage to another during DVS (see Table 9-6).
|VRAMP[1:0]||DVS Slew Rate|
|0b00||10 mV/μs (0.5 μs/step)|
|0b01||5 mV/μs (1 μs/step)|
|0b10||1.25 mV/μs (5 μs/step)|
|0b11||0.5 mV/μs (10 μs/step)|
Note that ramping the output to a higher voltage requires additional output current, so that during DVS, the converter must generate a total output current given by:
For correct operation, ensure that the total output current during DVS does not exceed the current limit of the device.