Question about LTC4415 heat generation

The 2A current limit protects the load. Thermal shutdown protects the part. I don't see the problem.
What kind of behavior/features are you looking for?

Hi,

The thermal shutdown works, the temperature of the LTC4415 drops, it recovers, and then the thermal shutdown works again.

This will repeat itself unless the LTC4415 is externally shut down.

In this case, as described in Note 4, the reliability of the LTC4415 will be compromised.

If thermal shutdown works multiple times in a row, should I stop the operation externally for the reliability of the LTC4415?

Is there any countermeasure if the overcurrent condition is not released and the LTC4415 continues to be overheated?

Regards,

Kazu

I see.
It may be easier to pivot to a different part than can survive continuous soft short.
Are you looking for an ideal diode with current limit?

Please share the specs of your application:

• Nominal and max V_IN
• Nominal and max I_LOAD
• Value of C_OUT

-Aaron

Hi Aaron,

Yes, I'm looking for an ideal diode with current limit function.

My specs are below.

 - Vin : 5V +/-5%  **2 inputs, ORing

- ILOAD : Set current limit to 3A

- Cout : =<100uF

Please let me know if you have a product that meets my specs.

I have an additional question about the enable (EN1, /EN2) of the LTC4415.

If 3.3V or 5V is applied to EN1 and /EN2 while power is not supplied to VIN1 and VIN2, is there a problem?

Regards,

Kazu

Suggestion 1: LTC4368

Suggestion 2: LTC4364

The LTC4368 will time-out instantly once you exceed the current limit.
The LTC4364 will actively limit current until C_TMR is charged.

Set R_SNS to 16mΩ-17mΩ to make I_LIM≈3A. (V_SNS=50mV for both parts)
Size C_OUT to limit V_OUT droop during switchover from one supply to the other.
Size C_GATE to limit inrush current into C_OUT.

Kazu said:

If 3.3V or 5V is applied to EN1 and /EN2 while power is not supplied to VIN1 and VIN2, is there a problem?

I have done this with other parts and not had a problem, but I'd have to check on the bench to be sure. Will update if I do.

Hope this helps,
-Aaron

Suggestion 1: LTC4368

Suggestion 2: LTC4364

The LTC4368 will time-out instantly once you exceed the current limit.
The LTC4364 will actively limit current until C_TMR is charged.

Set R_SNS to 16mΩ-17mΩ to make I_LIM≈3A. (V_SNS=50mV for both parts)
Size C_OUT to limit V_OUT droop during switchover from one supply to the other.
Size C_GATE to limit inrush current into C_OUT.

Kazu said:

If 3.3V or 5V is applied to EN1 and /EN2 while power is not supplied to VIN1 and VIN2, is there a problem?

I have done this with other parts and not had a problem, but I'd have to check on the bench to be sure. Will update if I do.

Hope this helps,
-Aaron