Operating modes L9758
26/30 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 V
LVI_LOW
. When L9758 is up and running and the supply voltages are less
than 5.5 V and are grater than or equal to V
LVI_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).
