Datasheet

LD39100XX, LD39100XX12, LD39100XX25 Application information
Doc ID 15676 Rev 3 17/23
6.2 Enable function
The LD39100xx features an enable function. When the EN voltage is higher than 2 V, the
device is ON, and if it is lower than 0.8 V, the device is OFF. In shutdown mode, consumption
is lower than 1 µA.
The EN pin does not have an internal pull-up, which means that it cannot be left floating if it
is not used.
6.3 Power Good function
Most applications require a flag showing that the output voltage is in the correct range.
The Power Good threshold depends on the adjust voltage. When the adjust is higher than
0.92*V
ADJ
, the Power Good (PG) pin goes to high impedance. If the adjust is below
0.80*V
ADJ
the PG pin goes to low impedance. If the device is functioning well, the Power
Good pin is at high impedance. If the output voltage is fixed using an external or internal
resistor divider, the Power Good threshold is 0.92*V
OUT
.
The use of the Power Good function requires an external pull-up resistor, which must be
connected between the PG pin and V
IN
or V
OUT
. The typical current capability of the PG pin
is up to 6 mA. The use of a pull-up resistor for PG in the range of 100 k
Ω to 1 MΩ is
recommended. If the Power Good function is not used, the PG pin must remain floating.