LDO40L - max. input voltage on PIN ENAB without demage on worst case

HGros.1 · ‎2020-08-04

LDO40L -> Enable PIN. Can I connect this pin directly to Uin to the Enabble-Pin or must I use a resistor (for example 10K for limiting Current input to the PIN Enab) to connct Enab to Uin for enable the chip?

Peter BENSCH · ‎2020-08-04

The datasheet of the LDO40L allows the voltage VEN at the enable pin voltage to be in the range of -0.3V...VIN (see page 5, abs max ratings).

So connecting EN to VIN is definitely allowed, no limiting resistor is necessary.

Good luck!

/Peter

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HGros.1 · ‎2020-08-06

Thanks for your answer.

On Page 14/ figure 13

If there is an input voltage jump within 1µs, is the output voltage deviation really 2V?

Thnks an best Regards

Heiko

Peter BENSCH · ‎2020-08-06

Perhaps you are referring to page 14, fig. 30 instead of fig. 13?

Then the transient at 10->15V, 1µs, Cout=2.2µF and Iout=1mA can be as high 2V, as the datasheet says. That is a typical behavior with ultra low quiescent current LDOs at low output currents and can be influenced with external circuitry.

Best regards

/Peter

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