LD39100

Application information

DocID15676 Rev 6

17/27

Figure 34: Power dissipation vs. ambient temperature

6.2

Enable function

The LD39100 features the enable function. When EN voltage is higher than 0.9 V, the

device is ON, and if it is lower than 0.4 V, the device is OFF. In shutdown mode,

consumption is lower than 1 µA.

EN pin has not an internal pull-up, so it cannot be left floating if it is not used.

6.3

Power Good function

Some applications require a flag showing that the output voltage is in the correct range.

impedance. If the device works well, Power Good pin is at high impedance. If the output

voltage is fixed using an external or internal resistor divider, Power Good threshold is

If the device is disabled (EN pin low) the PG signal is set to high impedance.This is done

intentionally to avoid pull down current by the PG pin in disabled mode.

Power Good function requires an external pull-up resistor, which has to be connected

resistor for PG should be in the range from 100 kΩ to 1 MΩ. If Power Good function is not

used, PG pin has to remain floating.

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