AM625: PMIC_LPM_EN0 connection

Jhon Q

Part Number: AM625
Other Parts Discussed in Thread: AM623, TPS65219

Tool/software:

Hi,

Is there issue keeping the connection of AM625 PMIC_LPM_EN0 signal to TPS6521904RHBR MODE/RESET pin as shown in guide page 14: https://www.ti.com/lit/an/slvafd0b/slvafd0b.pdf?ts=1725245413039 ?

My question is since this connection was removed in rev 0.07 of "AM625 / AM623 Starter Kit SK (EVM) WITH TPS6521904 PMIC" schematics.

Thank you,

John

3 months ago

0 Tushar Thakur 3 months ago

TI__Mastermind 30273 points

Hi John,

Thanks for reaching out to Texas Instruments E2E support forum.

I have routed your query to domain expert. Please expect reply in a day or two.

Regards,

Tushar

0 Kallikuppa Sreenivasa 3 months ago in reply to Tushar Thakur

TI__Guru**** 157609 points

Hello John,

I am assigning the query to the PMIC expert.

Regards,

Sreenivasa

+1 Brenda Diaz 3 months ago in reply to Kallikuppa Sreenivasa

TI__Mastermind 20066 points

Hi John,

Connecting the PMIC_LPM_EN0 to the PMIC MODE/STBY pin is optional. The TPS6521904 NVM has the MODE/STBY pin configured to select the Bucks switching mode with the following polarity:

MODE/STBY High, Bucks operate in forced-PWM
MODE/STBY Low, Bucks operate in auto-PFM.

If you are planning to use an AM62x low power mode where internal processor domains are turned-OFF while all the PMIC rails stay ON, then driving the MODE/STBY pin low with the PMIC_LPM_EN0 will allow to increase efficiency at light load.

Thanks,

Brenda

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AM625: PMIC_LPM_EN0 connection