LP8764-Q1: what is the differences between B4 and B5 parts (LP876411B4RQKRQ1 and LP876411B4RQKRQ1) in terms of the default I2C address, and their default set voltage for the 4 bucks?

Mahdi Saghaleini

Part Number: LP8764-Q1
Other Parts Discussed in Thread: TPS6594-Q1

1- The default I2C address for the B4 part is 0x4C, before we configure it to a different I2C address in our system. Does B5 variant also have the same default I2C address?

2- What are the 4 default set voltages for the 4 buck SMPS's in B5? We want to make sure that if we power up our board with a freshly installed B5 part in it, the voltages will not harm our processor, before we are able to configure it with our own config file. You may ask why we need to power it up in the first place, and the answer gets into some complications that we might have, so assume that this is what we have to do, and we just want to know the default set voltages for a fresh B5 device.

Thanks

5 months ago

0 Jari Niemela13 5 months ago

TI__Expert 6410 points

Hi Mahdi,

You mean devices LP876411B4RQKRQ1 and LP876411B5RQKRQ1?

1. These are intended for different PDN's to be used together with TPS6594-Q1 devices. Please see https://www.ti.com/lit/ug/slvucj9/slvucj9.pdf about default I2C address. For LP876411B5 it is 0x58. For LP876411B4 information can be found from https://www.ti.com/lit/ug/slvucf3/slvucf3.pdf.

2. From same document https://www.ti.com/lit/ug/slvucj9/slvucj9.pdf page 17 the default BUCK1 voltage is 0.8V.

Br, Jari

Power management

Power management forum

LP8764-Q1: what is the differences between B4 and B5 parts (LP876411B4RQKRQ1 and LP876411B4RQKRQ1) in terms of the default I2C address, and their default set voltage for the 4 bucks?