Dear Sir / Madam,

I would like to find out the LTM4643 efficiency when DC-DC is operating in ambient temperature above 80 deg.

Find out that the following Power Loss Multiplicative Factors in LTM4676A datasheet

With this table, we can estimate the power…

Hello,

when one of the four channels of the LTM4643 is disabled (by driving RUNx low), what is the status if VCCINTx and PGOODx ?

E.g. pin RUN2 is tied to GND. Is VCINT2 regulator still turned on? Is PGOOD2 output driven low?

Thank you,

Josef Rypar

Hello，

我们单板在用LTM4643，在工厂生产的时候发现这个芯片BGA有焊接问题，切片报告显示：

1. failure的点在下图红线的那一竖排的pin1/2/3.

2. 断裂面比较平整

请问这个问题一般是什么原因导致？你们客户是否有遇到过类似的问题？ 谢谢

Hello,

Can you please tell me what the Power Supply Rejection Ratio is for the LTM4643?

Thanks,

Motz

Hi all,

I have a question about LTM4643.

If there are unused channels,
Please tell me how to handle unused channel pins.

Pins) Vin, SVin, FB, COMP, PGOOD

Thanks

Hello,

I have a question to the power good pins of the LTM8049 vs LTM4643. I am using both in the same circuit. Both are enabled with RUN-pin from the same multiplexer. Both have a pull-up with 100k at their PG-pin and than drive a LED via an FDN357n…