DocID14273 Rev 5

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L9758

Operating modes

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rate of the common voltage reference so the slew is different for each regulator because all

start together and reach the steady-state at the same time but with different voltage levels.

6.3

Power down

The power down sequence starts when both IGN and PSU_EN signal are low. In this phase

there is no control of the linear regulator output voltages. The falling slew-rate is defined

from load currents and load capacitors. A voltage comparator controls VDDL voltage and

ensures that the VDDL supply voltage will drop below 2V before initiating a new power-up

sequence.

Figure 4. Power up/down sequence