TPS61041-Q1: Test method

Koji Hayashi92

Mastermind 6970 points

Part Number: TPS61041-Q1

Hi TI-team

1:Is it possible to apply 10mA to each terminal from the GND terminal ?

Is there a possibility that the IC will be damaged ?

Also, can you guarantee on all terminals after this test ?

IC assumes non-energization.

2:Is there a current value or voltage value that can be guaranteed if the current value can not be guaranteed at 10mA ?

3:Please tell us if there are min, typ and max data about Vf value of each terminal when 10mA of No. 1 is energized.

Best Regards,

Koji Hayashi

over 4 years ago

0 Zack Liu over 4 years ago

TI__Mastermind 34201 points

Hi Koji,

Can you specialize which pin?

EN pin maximum input leakage current is 1uA. FB pin maximum input bias current is 1uA.

I don't understand why you ask this question. Did you meet any issues when using it?

0 Koji Hayashi92 over 4 years ago in reply to Zack Liu

Mastermind 6970 points

Hi Zack-san

Thank you for response.

It is for confirmation of the protection diode.

Therefore, all pins are targeted.

For example, when a current of 10 mA is applied from EN to GND.

Best Regards,

Koji Hayashi

0 Zack Liu over 4 years ago in reply to Koji Hayashi92

TI__Mastermind 34201 points

Hi Koji,

What kind of protection diode do you mean? Do you have a schematic?

It is more common to give a absolute maximum voltage rating on each pins. You can refer to part 6.1 Absolute Maximum Ratings in datasheet.

If the voltage applied on EN pin is not higher than maximum voltage rating, the current will not bigger than 1uA because this pin inside is high resistance.

0 Koji Hayashi92 over 4 years ago in reply to Zack Liu

Mastermind 6970 points

Hi Zack-san

It will check the internal protection diode.

My customer would like to check by sending 10mA from the EN pin to GND with no voltage applied to VIN.

Best Regards,
Koji Hayashi

0 Zack Liu over 4 years ago in reply to Koji Hayashi92

TI__Mastermind 34201 points

Hi Koji-san,

Sending 10mA from EN pin to GND will break the IC because EN pin is high resistance.

0 Koji Hayashi92 over 4 years ago in reply to Zack Liu

Mastermind 6970 points

Hi Zack-san

How much current is it okay ?

Best Regards,

Koji Hayashi

0 Zack Liu over 4 years ago in reply to Koji Hayashi92

TI__Mastermind 34201 points

Hi Koji,

EN pin maximum input leakage current is 1uA. FB pin maximum input bias current is 1uA.

You can get these information in datasheet Electrical Specification Table.

0 Koji Hayashi92 over 4 years ago in reply to Zack Liu

Mastermind 6970 points

Hi Zack-san

Thank you for response.

I'm sorry,

My customer would like to check by sending 10mA from the GND to EN pin with no voltage applied to VIN.

(GND to SW pin etc)

What about this case ?

Best Regards,
Koji Hayashi

0 Zack Liu over 4 years ago in reply to Koji Hayashi92

TI__Mastermind 34201 points

Hi Koji,

Please don't do this test. EN pin is high resistance, 10mA current will cause very high voltage and will break down this pin.

I haven't never heard any customer used to do this test. I don't understand why your customer need to do that. And TI doesn't have a protection diode for it.

0 Koji Hayashi92 over 4 years ago in reply to Zack Liu

Mastermind 6970 points

Hi Zack-san

How much amperage can safely conduct ? 1mA ?

Customer wants to do an open / short test.

Best Regards,

Koji Hayashi

0 Zack Liu over 4 years ago in reply to Koji Hayashi92

TI__Mastermind 34201 points

Hi Koji,

What kind of open/short test does customer want to do?

Let me say it again, it's high resistance. When you apply a voltage, there is a leakage current. The leakage current is 1uA.

0 Koji Hayashi92 over 4 years ago in reply to Zack Liu

Mastermind 6970 points

Hi Zack-san

Thank you for response.

If there was a protection diode, the customer was considering the test as shown below.

Does that mean there is no protection diode on any pin?

Best Regards,

Koji Hayashi

0 Koji Hayashi92 over 4 years ago in reply to Zack Liu

Mastermind 6970 points

Hi Zack-san

Thank you for response.

If there was a protection diode, the customer was considering the test as shown below.

Does that mean there is no protection diode on any pin?

Best Regards,

Koji Hayashi

0 Zack Liu over 4 years ago in reply to Koji Hayashi92

TI__Mastermind 34201 points

Hi Koji,

As you can see in the picture, two protection diodes are inside. The upper one means EN pin voltage cannot exceed Vin. The bottom one means EN pin cannot exceed -0.3V.

0 Koji Hayashi92 over 4 years ago in reply to Zack Liu

Mastermind 6970 points

Hi Zack-san

This IC have internal protection diode at its input pin.

If it is correct, what is the current value from GND to the EN pin which does not go below -0.3V ?

Best Regards,

Koji Hayashi

0 Zack Liu over 4 years ago in reply to Koji Hayashi92

TI__Mastermind 34201 points

Hi Koji,

We would not say the maximum current rating. In stead, here I said EN pin could not be below -0.3V. That's the constant DC voltage. A constant voltage below -0.3V will break the diode between EN and GND pin.

0 Koji Hayashi92 over 4 years ago in reply to Zack Liu

Mastermind 6970 points

Hi Zack-san

Thank you response.

I understand.
TI can not specify the current value.

What about the SW terminal ?
Can current flow from GND to SW ?

Best Regards,

Koji Hayashi

0 Zack Liu over 4 years ago in reply to Koji Hayashi92

TI__Mastermind 34201 points

Hi Koji,

No. The MOSFET inside is a NMOS. So the body diode exists. The cathode side is SW and anode side is GND. So you cannot apply a constant voltage from GND to SW. Please see table 6.1.

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TPS61041-Q1: Test method