LP87524B-Q1: How can control output voltage? LP87524B-Q1

hyunsung joung

Prodigy 60 points

Part Number: LP87524B-Q1

Hello.

Would you advise how can buck3 output voltage regulate 2.3V to 1.3V ?

(I need 3.3V, 1.2V, 1.8V and 1.3V)

Should i change R35~R37? or re-program on PMIC?

I read data sheet. However, i don't know exactly.

Can you give me detail solutions?

PMIC Sch.pptx

Thank you

over 3 years ago

0 Gerard Copeland over 3 years ago

TI__Genius 10200 points

Hi,

Thank you for providing your schematic.

I have assigned your post to our expert for this device. Please excuse a delay in response due to the holidays. Our expert will get back to you as soon as they can.

Thanks,

Gerard

0 Tomi Koskela over 3 years ago

TI__Genius 11020 points

Hello Hyonsung,

Output voltage needs to be adjusted with I2C register writes, BUCK3_VSET register to be exact. Please note the I2C writes only change the register setting (volatile memory) and after power down the setting is lost and must be written again on power on.

You can see more information about the OTP settings in the TRM: https://www.ti.com/lit/ug/snvu663/snvu663.pdf

You can also check the configuration guide for this product family: https://www.ti.com/lit/ug/snvu590/snvu590.pdf

Thanks.

Regards,

Tomi Koskela

Power management

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LP87524B-Q1: How can control output voltage? LP87524B-Q1