Hi team，
My customer is using TPS7B84-Q1 in their project. They would like to use TLIN1028-Q1's internal LDO output(3.3V) to control the enable function of TPS7B84. I'd like to know whether they could connect EN pin with 3.3V output of the LDO directly or any external pull up/down resistor or capacitor have to be used?
Thanks,
Scarlett
Hi Scarlett,
It's all about whether the TLIN1028 can pull up or pull down the EN pin to meet the TPS7B84 datasheet requirements while not exceeding the abs max conditions.
According to the TPS7B84 datasheet, the abs max voltage on the EN pin is 42V, so that's not an issue, and it cannot be toggled on / off for greater than 5 kHz (which also should not be a problem).
The TPS7B84 datasheet lists the following voltage thresholds and current requirements for the EN pin.
As expected the TLIN1028 is more than capable of driving this EN pin current. By this analysis, you can connect the two directly together if you wish.
Thanks,
- Stephen
