AMC3306EVM: Actual value of load current from HLDO_OUT pin

Y.Ottey

Part Number: AMC3306EVM
Other Parts Discussed in Thread: AMC3306M25

Dear TI Team

The customer wants to use the AMC3306EVM to check the behavior when the HLDO_OUT pin is overloaded.
Checking the data sheet, it is stated that it can handle loads up to IH = 1mA as shown in the table below.

I want you to answer the following questions.

1. 1. The data sheet of AMC3306M25 (installed in AMC3306EVM) states that the external load should not be connected as shown below.
　Does this mean that a load of 1mA or more should not be connected?

2. Will it be damaged when a load of 1mA or more is applied?
(The rated current of the HLDO_OUT pin was not specified)

Best Regards,
Y.Ottey

over 3 years ago

0 Tom Hendrick over 3 years ago

TI__Guru**** 173766 points

Hi Y. Ottey,

You are mixing specifications. The AMC3306 has 2 LDO's, one on the high side (HLDO_OUT, pin 5) and one on the low side (LDO_OUT, pin 13). The table snippet you have above is for pin 5 (high side LDO) and the text you copied from section 7.3.5 of the datasheet refers to pin 13, the low side LDO.

You won't damage the device with a 1mA load applied to pin 5, beyond 1mA you will start to see performance issues

0 Y.Ottey over 3 years ago in reply to Tom Hendrick

Mastermind 6145 points

Hi Tom,

Thank you for your reply.

I understand the content of your reply.

”You won't damage the device with a 1mA load applied to pin 5, beyond 1mA you will start to see performance issues”

Regarding the above, if the load from pin 5 (HLDO_OUT) is greater than 1mA, is there any damage to the device?
Our customer is planning to carry out a 5pin overload test.
They are concerned that loads greater than 1mA will not damage the device.

Regards,
Y.Ottey

0 Tom Hendrick over 3 years ago in reply to Y.Ottey

TI__Guru**** 173766 points

Hi Y. Ottey,

With loading beyond 1mA you will begin to see the LDO voltage start to drop. Limit the loading to 110% and you should be fine.

0 Y.Ottey over 3 years ago in reply to Tom Hendrick

Mastermind 6145 points

Hi Tom,

Thank you for your reply.

"Limit the loading to 110% and you should be fine."

Is it okay to recognize that the device will not be damaged if the load from the HLDO_OUT terminal is limited to 1.1mA or less?

Regads,
Y.Ottey

0 Tom Hendrick over 3 years ago in reply to Y.Ottey

TI__Guru**** 173766 points

Correct.

0 Y.Ottey over 3 years ago in reply to Tom Hendrick

Mastermind 6145 points

Hi Tom,

Thank you for your reply.

For example, if a load of 1.2mA is applied to the HLDO_OUT pin, does it mean that the device may be damaged?

0 Tom Hendrick over 3 years ago in reply to Y.Ottey

TI__Guru**** 173766 points

Y. Ottey,

As I mentioned before, with higher loads on HLDO_OUT you will begin to see performance issues. I do not have a load current value that might cause damage to the chip. My recommendation to you is to follow the datasheet and limit the current on HLDO_OUT to 1mA.

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AMC3306EVM: Actual value of load current from HLDO_OUT pin