TPS2034: About rDS(ON) at VIN=5V, Tj=-40℃ to 125℃, Iout=2.0A

Hello Kanemaru,

Unfortunately, this data will be very hard to obtain because this is a very old device. We are in the process of posting recommended replacements for these old parts on the TI web site. For the TPS2034, we recommend using TPS2001CDGN instead. You can find the TYP and MAX Rdson for TPS2001CDGN in the datasheet (25C and over temperature).

Hi Eric-san,

Thank you for suggestion of TPS2001C.

However, they need the rise time more than around 3ms so this device can’t satisfy their demand.

Regards,

Kanemaru

OK. Per my other reply, can you tell me why the rise time is so important? Is it to help manage inrush current into a large output capacitor?

Hi Eric-san,

We understand that it is difficult for you to confirm specifications newly.

However, we would like to ask you a question.

According to our customer, they need “rDS(on) less than 100mohm at VIN=5V, Tj=-40℃ to 125℃, Iout=2.0A.

I guess that rDS(on) is less than 100mohm at this conditions.

(I referred to the following contents.)

Could you please let us know if you have estimated value?

I’d greatly appreciate your verification.

Regards,

Kanemaru

Hi Kanemaru-san,

From my side using the graphs and data within the DS, rDS(on) is < 100mohm at VIN=5V, Tj=-40℃ to 125℃, Iout=2.0A.

Please see Note 1 under the EC table in the DS: (1) Pulse-testing techniques maintain junction temperature close to ambient temperature; thermal effects must be taken into account separately.

The rDS(on) in the datasheet (in the EC table and curves) is measured using pulse techniques to minimize self heating during the test. In a regular application at any temperature and steady-state Iout the rDS(on) will be higher than what is stated in the datasheet (called Static drain-source on-state resistance). But, it seems there is still a lot of margin between 50mohm in the datasheet and the customer req't of 100mohm maximum. So, I think it is OK.

Do you know if your customer's application (and VIN power supply) can tolerate the high trip current for TPS2034 as shown in Figure 21 and Figure 22?

Hi Eric-san,

Thank you for the information.

And, I will report your concern point to our customer.

Regards,

Kanemaru