TPS61098: Efficiency data via temperature

Yasushi Fujiwara

Genius 11935 points

Part Number: TPS61098

Hello Experts,

My customer would like to know the efficiency variation via temperature. Could you provide it? The efficiency is usually decreased at high temperature due to RDSon will be increased. Is my understanding correct?

Best Regards,
Fujiwara

over 3 years ago

0 Minqiu Xie over 3 years ago

TI__Mastermind 21565 points

Hi Fujiwara:

May I know what's the Vin, Vout, and load condition? And what temperature range do you want?

0 Yasushi Fujiwara over 3 years ago in reply to Minqiu Xie

TI__Genius 11935 points

Hi Minqiu,

Here is the answer for your question.
- Vin: 3.0V
- Vout: 3.0V~3.3V
- Load condition:
> VMAIN: 5mA max
> VSUB: 30mA max
- Temperature range: -20~+70degC

Best Regards,
Fujiwara

0 Minqiu Xie over 3 years ago in reply to Yasushi Fujiwara

TI__Mastermind 21565 points

Hi Fujiwara:

Got it. I'll collect some data for you today or tomorrow.

0 Minqiu Xie over 3 years ago in reply to Minqiu Xie

TI__Mastermind 21565 points

Hi Fujiwara:

Sorry for keeping you waiting. The thermal lab is full scheduled these days. Please wait one more days. Thanks for your kind understanding.

0 Minqiu Xie over 3 years ago in reply to Minqiu Xie

TI__Mastermind 21565 points

Hi Fujiwara:

What's the exact device you looking for? I just realized that TPS61098 Vout is fixed at 4.3V.

0 Yasushi Fujiwara over 3 years ago in reply to Minqiu Xie

TI__Genius 11935 points

Hi Minqiu-san,

Customer is considering for TPS610981 and TPS610986.

Best Regards,
Fujiwara

0 Minqiu Xie over 3 years ago in reply to Yasushi Fujiwara

TI__Mastermind 21565 points

Hi Fujiwara:

These device have different functions at Vsub pin.

And customer want to do the decision after the efficiency comparison, right?

0 Yasushi Fujiwara over 3 years ago in reply to Minqiu Xie

TI__Genius 11935 points

Hi Minqiu-san,

Yes, customer would like to know the efficiency for both devices. Are two devices efficiency so different? Anyway, I appreciate if you can get both data. Or can you comment whether the efficiency will decrease if temperature is raised? Customer would like to know tendency of the efficiency via temperature.

Your support would be much appreciated.
Best Regards,
Fujiwara

0 Minqiu Xie over 3 years ago in reply to Yasushi Fujiwara

TI__Mastermind 21565 points

Hi Fujiwara:

For the Sub output of TPS61098x, it has LDO mode and switch mode. For the Switch mode, the efficiency is similar to the Vmain output side for such load condition. So I simplify the test.

-------------------------------------------------------------------------------------

Sub with LDO mode Efficieny. Vsub=3V.

Vin V	Io Sub mA	eff	Temp
3	10	0.838106	-20
3	30	0.852557	-20
3	10	0.83007	25
3	30	0.853383	25
3	10	0.83186	70
3	30	0.848831	70

-------------------------------------------------------------------------------------

Vmain Efficiency . Vmain=3.3V

Vin	Io Main	eff	Temp
3	5	0.969526	-20
3	10	0.974268	-20
3	20	0.963679	-20
3	30	0.955497	-20
3	5	0.965669	25
3	10	0.971789	25
3	20	0.960105	25
3	30	0.952699	25
3	5	0.960975	70
3	10	0.967638	70
3	20	0.956661	70
3	30	0.949451	70

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TPS61098: Efficiency data via temperature