TPS61230: Leakage current into the Enable pin.

guy lemire

Part Number: TPS61230

Hello,

I am using an external open drain circuit to enable/disable the TPS61230. I am pulling the Enable pin up to 3.3V with an external 100k resistor. I am measuring about 1.5V on the enable pin. I am seeing about 18uA of leakage in order to measure 1.5V.

Can you tell me what the leakage current is typically into the enable pin?

I am thinking I need a stronger external pullup. What value of pullup do you recommend when using an external circuit to enable/disable the regulator.

Regards,

Guy

over 7 years ago

0 Jasper Li over 7 years ago

TI__Mastermind 46905 points

100K is a reasonable value. the 15uA is much larger than I expected.
how do measure the voltage in EN pin? the probe impedance may cause the large leakage current. also double check the resistance of the 100k resistor.

0 guy lemire over 7 years ago in reply to Jasper Li

Intellectual 970 points

Hello Jasper, thank you for the response.

I am using this regulator in the following manner.

Vin = 1.8V

Vout=0.85V

Iout=1 Amp

My enable pin is tied via a 100k ohm resistor to 3.3V. Is this an issue having VEN > VIN?

Regards,

Guy

0 Jasper Li over 7 years ago in reply to guy lemire

TI__Mastermind 46905 points

I'm afraid you reply the wrong post. the TPS61230 is a boost converter, VIN is lower than VOUT.

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TPS61230: Leakage current into the Enable pin.