LMR23630: About Iq in the buck

GARAM AN

Intellectual 1990 points

Part Number: LMR23630

Hello,

http://www.ti.com/lit/an/slyt412/slyt412.pdf

In this document, Condition to measure of Iq is "no-load" and "non-switching", and "non-switching" means that no power switch in the IC is on.

Could you explain this meaning?

Is "no power switch in the IC is on" meaning that input voltage is not turned on?

And, documents said "Iq comes from Vin and Vout", but the condition of Iq is "no-load"

"no-load" means that Vout is not connected with nothing, then how the Iq can flow from Vout?

Thank you

over 5 years ago

0 Iven Su over 5 years ago

TI__Expert 8245 points

Hi,

"non-switching" means EN is on but the device is not switching.

For buck converter, as the note says, it draws IQ only from its input.

0 GARAM AN over 5 years ago in reply to Iven Su

TI__Intellectual 1990 points

Thank you Iven,

What is the condition of the "EN is on" and "device is not switching"?

Ven < 1v, this device will shut down

Ven > 1.6v, regulator will start.

if 1v< Ven < 1.6v, is this the condition of "device is not switching"?

What is the correct "device is not switching" condition?

0 Iven Su over 5 years ago in reply to GARAM AN

TI__Expert 8245 points

Hi,

The condition is manually created by some complex pin programming and setup, which is not easy to achieve on bench test. It just shows a high efficiency ability.

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LMR23630: About Iq in the buck