LMR33630-Q1: design question about PG pin

Hi Henry,

Henry Wang3 said:

The Ven is Vin/2, when Vin drops to 5V, the Ven = 2.5V > 2V. (power good remains valid as long as the input voltage is ≥ 2 V (typical))

Yes, in the datasheet spec table, for PG pin to output correctly, VIN must be 2V or greater. See below:

Henry Wang3 said:

And the PG pin tied a 10k Ohm to an external 3.3V.

The Iout is 2A, if the Vdrop is 0.5V, the Vout drops from 5V to 4.5V, and VFB = 90%.

By those conditions, will it cause the PG to go low?

Yes that is correct.

Ben

Hi Sir,

Thank you for your kind reply.

The design condition is the LMR333630 PG pin turn low, will turn off the TPS745 output voltage.
Could you please help to review the below schematic?  Thanks!

LMR33630_TPS745.pdf