LT8350RVPBF datasheet(15/24 Pages) AD

15 / 24 page

LT8350

Rev. 0

For more information www.analog.com

OPERATION

linearly from 0.25V to 1V (and beyond), the output voltage

VOUT rises smoothly to its final regulation voltage.

Once the SS pin is charged above 1.75V, the LT8350

enters the OK/RUN state, where the output short detec-

tion is activated. The output short means that VFB < 0.25V.

When the output short happens, the LT8350 enters the

FAULT/RUN state, where a 1.25µA pull-down current

slowly discharges the SS pin with the other conditions the

same as the OK/RUN state. Once the SS pin is discharged

below 1.7V, the LT8350 enters the DOWN/STOP state and

the short detection is deactivated with the previous fault

latched. Once the SS pin is discharged below 0.2V and

the LOADON signal is still high, the LT8350 goes back to

the UP/RUN state.

In output short condition, the LT8350 can be set to hic-

cup, latch-off, or keep-running fault protection mode with

a resistor between the SS and VREF pins. Without any

resistor, the LT8350 will hiccup between 0.2V and 1.75V

and go around the UP/RUN, OK/RUN, FAULT/RUN, and

DOWN/STOP states until the fault condition is cleared.

With a 499kΩ resistor, the LT8350 will latch off until the

EN/UVLO is toggled. With a 100kΩ resistor, the LT8350

will keep running regardless of the fault.

• SS HARD PULL-DOWN

• SWITCHING DISABLED

• LOADTG TURNED OFF

• NO SHORT DETECTION

• SS 12.5µA PULL-UP

• SWITCHING DISABLED

• LOADTG TURNED ON

• NO SHORT DETECTION

• SS 12.5µA PULL-UP

• SWITCHING ENABLED

• LOADTG TURNED ON

• NO SHORT DETECTION

• SS 1.25µA PULL-DOWN

• SWITCHING DISABLED

• LOADTG TURNED ON

• NO SHORT DETECTION

• SS HARD PULL-DOWN

• SWITCHING DISABLED

• LOADTG TURNED OFF

• NO SHORT DETECTION

WAIT 10µs AND

LOADON = HI

POR = HI OR

ISOC = HI

SS < 0.2V

SS > 0.25V

SS > 1.75V

SS < 1.7V

• SS 12.5µA PULL-UP

• SWITCHING DISABLED

• LOADTG TURNED OFF

• NO SHORT DETECTION

• SS 12.5µA PULL-UP

• SWITCHING ENABLED

• LOADTG TURNED ON

• SHORT DETECTION

• SS 1.25µA PULL-DOWN

• SWITCHING ENABLED

• LOADTG TURNED ON

• SHORT DETECTION

8350 F08

SS < 0.2V AND

LOADON = HI

WAIT 10µs

INIT

UP/PRE

OK/RUN

FAULT/RUN

POR

UP/TRY

UP/RUN

DOWN/STOP

Figure 8. Start-Up and Fault Sequence

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