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Table 7-3. LM73100 PG Indication Summary

Event

Protection Response

PG Pin

PG Delay

Undervoltage (UVP or UVLO)

Shutdown

Input Reverse Polarity

Shutdown

Overvoltage (OVLO)

Shutdown

L (If PGTH < VPGTH(F))

tPGD

Steady State

N/A

H (If PGTH > VPGTH(R))

L (If PGTH < VPGTH(F))

tPGA

tPGD

Short-Circuit

Fast trip

H (If PGTH > VPGTH(R))

L (If PGTH < VPGTH(F))

tPGA

tPGD

Reverse current ((VOUT - VIN) >

VREVTH)

Reverse current blocking

tPGD

Overtemperature

Shutdown

L (If PGTH < VPGTH(F))

tPGD

When there is no supply to the device, the PG pin is expected to stay low. However, there is no active pull-down

in this condition to drive this pin all the way down to 0 V. If the PG pin is pulled up to an independent supply

which is present even if the device is unpowered, there can be a small voltage seen on this pin depending on the

pin sink current, which is a function of the pull-up supply voltage and resistor. Minimize the sink current to keep

this pin voltage low enough not to be detected as a logic HIGH by associated external circuits in this condition.

LM7310

SNOSDC0 – OCTOBER 2020

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