PMP4497: Configuring for 1.8V

Juliana Rolandelli53

Prodigy 40 points

Part Number: PMP4497
Other Parts Discussed in Thread: TPS53632,

This design has the output voltage max at 1.2V, do you have any designs that go from 48V to 1.8V?

It looks like the TPS53632 limits the voltage to 1.2V

over 3 years ago

0 Juliana Rolandelli53 over 3 years ago

Prodigy 40 points

Can you also comment on why PMP4497 is limited to 1.2 V vout, even though when TPS53632 is limited to 1.52 V

0 Bernd Geck over 3 years ago in reply to Juliana Rolandelli53

TI__Intellectual 2770 points

Hello Juliana,

at "standard" controllers min Vin is limited to Vref due to virtual short circuit at OpAmp input;
this device got some more IP in it. Despite Vref 1.7V the 6-bit VID i/f allows Vout 500mV to 1.52V
by resolution in 64 steps.

BUT: another limitation needs to be considered by input voltage, switching frequency and number
of phases - i.e. at Fsw 1MHz max. output voltage is 1.28V !

The spreadsheet helps to figure out the suited Fsw according to needed Vout.

Best regards, Bernd

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PMP4497: Configuring for 1.8V