TPS3899: Internal resister value on RESET Assert, and MAX output voltage on Vdd=5V.

Motoyasu Hattori

Part Number: TPS3899
Other Parts Discussed in Thread: TLV758P,

Hi,

On the datasheet of TPS3899DL, when Vdd=3.3V, IRESET(Sink)=2mA, Output Voltage is MAX 300mV. So MAX internal resistor is 300mV/2mA=150ohm. Is it correct?

Also, How about Vdd=5.0V? Could you please let us know MAX Output Voltage under the Vdd=5.0V, IRESET(Sink)=xxx?

My customer wants quick wake-up by reducing pull-up resister value on TPS3899DL. However, he worries about the following topics. That is why he is asking.

Power-consumption on TPS3899DL, due to his system environment.
Increasing MAX Output voltage, due to reducing pull-up resister

Thanks and best regards,
M.HATTORI.

over 2 years ago

+1 Jesse Villanueva over 2 years ago

TI__Genius 13840 points

Hello,

We do not have the characterization for the Vdd=5V, but since the 300mV/2mA=150ohm is accounted as the worst case, you should be able to use that value for the 5V as well.

Do you know what resistor value they are going to reduce to?

Jesse

0 Motoyasu Hattori over 2 years ago in reply to Jesse Villanueva

TI__Genius 9355 points

Jesse-san,

I am wrong to push "resolve button".

>> Do you know what resistor value they are going to reduce to?

My customer plans use 1.5k_ohm pull-up resister to 5V, and Vcc=5V. On this case, is "MAX voltage of TPS3899DL" 300mV? He wants to confirm it, because TPS3899 output is connected with TLV758P_EN whose minimum input voltage is 300mV. Any comments are welcome. Please advise us.

Thanks and best regards,
M.HATTORI.

0 Jesse Villanueva over 2 years ago in reply to Motoyasu Hattori

TI__Genius 13840 points

Hattori-san,

1.5kohm is way too low for a pull up resistor for this application. The advised range is around 10kohm-50kohm.

Jesse

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TPS3899: Internal resister value on RESET Assert, and MAX output voltage on Vdd=5V.