BQ76952: Why REG1 output get abnomal

Gabriel Wang1

Part Number: BQ76952

Dear Expert

We use BQ7695202 version , and use REG1 supply isolate I2C pull up ,but if we start up ,the REG1 output get low like below ,could u give us some suggstion.

over 1 year ago

0 Luis H. S. over 1 year ago

TI__Mastermind 42060 points

Hello Gabriel,

This looks like the REG1 output is hitting its maximum current output. When this happens, voltage drops to 0-V. Check the current flowing out of the device.

Best Regards,

Luis Hernandez Salomon

0 Gabriel Wang1 over 1 year ago in reply to Luis H. S.

Genius 4735 points

Dear Expert

Could u give the calculation formula for the relationship in the LDO section of 952 similar to BQPL455.

0 Luis H. S. over 1 year ago in reply to Gabriel Wang1

TI__Mastermind 42060 points

Hello Gabriel,

There is no formula for this. The PL455 is a completely different device with a different architecture.

REGIN serves to power the internal LDO. The current limit and LDO behavior at different loads is explained in the datasheet.

Best Regards,

Luis Hernandez Salomon

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BQ76952: Why REG1 output get abnomal