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TPS74401: first TPS74401‘ PG enable second TPS74401’EN

Part Number: TPS74401

Hello!
I have a similar circuit, but the input voltage is 1.5 V, output 1.0 V, bias 3.3 V.
The PG pin is pulled up to 1.5 V through 5 k resistor.
The first TPS works (1.0V output), but the level on its PG pin is only 0.6 V. So the second TPS is off (0.6 V on it's EN).
Why is the PG voltage level so low?

e2e.ti.com/.../webench-tools-tps74401-first-tps74401-pg-enable-second-tps74401-en