Operating modes

L9758

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DocID14273 Rev 5

6.4

Low voltage operation

When L9758 is up and running it is fully operational with the VBAT and VBAT_SW pin

voltages down to VLVI_LOW. When L9758 is up and running and the supply voltages are less

than 5.5 V and are grater than or equal to VLVI_LOW if the boost option is used the device is

fully operational. If only the buck regulator is used the L9758 operates as follows:



Switching regulator runs at 100% duty cycle;



VKAM and VSTBY regulators are fully operational;



VDDL fully operational;



VCORE fully operational;



VDD5 out of range with output voltage no less than 3.2 V;



Tracking regulators out of range with output voltages no less than 3.2 V;



Reset monitor RST5 and RSTL fully operational, with reset at RST5 pin is allowed.

6.5

High voltage operation

The L9758 is fully operational during jump start when the battery is temporarily replaced

with a higher voltage source to aid starting the engine (26.5 V for 1 minute). The L9758 is

fully operational during positive battery transient such as load dump (40 V maximum voltage

with durations of up to 400 ms).