TPS23523: Power MOSFETs for use with TPS23523

John Williamson

Part Number: TPS23523
Other Parts Discussed in Thread: CSD19536KTT

Successful deployment of the TPS23523 is dependent on the MOSFETs doing the hotswapping. Could TI please recommend a surface mount MOSFET for use in this capacity? In addition to being surface mount, the desired MOSFET needs to have a VDSmax of at least 150V and an RDS(on) < 5mOhms to keep the operating temperature under control. It is expected that the maximum load current could be as high as 30A. It is also of great importance that there is at least a 30% margin for all SOAs (as per the TI calculator tool for TPS23523). Ideally, there would only be a single MOSFET being controlled by GATE and GATE2 but putting two in parallel in one or both positions is not a show-stopper.

Thanks.

over 3 years ago

0 Avishek Pal over 3 years ago

TI__Mastermind 39610 points

Hi Jhon,

Welcome to E2E !!! Thanks for your interest on TPS23523.

CSD19536KTT can be used for Hot Swap functionality. It comes with lower R_DSON and good SOA.

IPB073N15N5: 150 V MOSFET for ORing circuit

IRFB4227PbF: 200 V MOSFET for ORing circuit

0 John Williamson over 3 years ago

Prodigy 10 points

Hi Avishek,

Thanks for the quick response. I found that I was reading the SOA curves for CSD19536KTT incorrectly. I realize now that the DC curve is worst case and that ISOA(100ms) and ISOA(1000ms) cannot be lower than the DC case. However, even with these corrected values, the Excel based TI calculator tool for TPS23523 still returns the following SOAs:

1) SOA Margin: Hot short/start into short 0.62

2) SOA Margin: Start up 2.45

3) SOA Margin: Current Limit 1.87

This means I cannot use CSD19536KTT for this application. Any other suggestions are welcome.

Regards,

0 Avishek Pal over 3 years ago in reply to John Williamson

TI__Mastermind 39610 points

Hi Jhon,

Please share the design calculator. Let me have a look.

0 John Williamson over 3 years ago in reply to Avishek Pal

Prodigy 10 points

TPS2352X_Excel_Tool_Web_RevBEXP.xlsx

Hi Avishek,

Hopefully you will be able to open this. It contains the latest status of the calculator too.

Regards,

0 John Williamson over 3 years ago in reply to John Williamson

Prodigy 10 points

Sorry, I've just found that the values were not saved properly. Try this.

TPS2352X_Excel_Tool_Web_RevBEXP2.xlsx

0 Avishek Pal over 3 years ago in reply to John Williamson

TI__Mastermind 39610 points

Please see the modified design calculator and let me know if there is any query.

TPS2352X_Excel_Tool_EXP2_Modified by TI.xlsx

PSMN4R8-100BSE can used as Q1 to meet the SOA requirements.

0 John Williamson over 3 years ago in reply to Avishek Pal

Prodigy 10 points

Hi Avishek,

I admit the configuration with the PSMN4R8-100BSE in the Q1 position and 3 parallel CSD19536KTT in the Q2 position gives a working solution. However, I am using 2 PSMN3R7-100BSE in parallel for Q1 and another 2 in parallel for Q2 and this works just as well.

Regards,

Power management

Power management forum

TPS23523: Power MOSFETs for use with TPS23523