ST1L05 datasheet(20/30 Pages) STMICROELECTRONICS

20 / 30 page

Application information

ST1L05

20/30

DocID14492 Rev 3

The junction temperature of the device is:

TJ_MAX = TA + RthJA x PD

where:

TJ_MAX is the maximum junction of the die, 125 °C

TA is the ambient temperature

RthJA is the thermal resistance junction-to-ambient

6.2

Enable function (ST1L05B, ST1L05C and ST1L05D only)

The ST1L05 features the enable function. When 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. EN pin has an internal pull-up, so it can be left floating if it is not used.

6.3

Power Good function (ST1L05B and ST1L05D only)

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

Power Good threshold depends on the adjust voltage. When the adjust is higher than

0.92*VADJ, Power Good (PG) pin goes to high impedance. If the adjust is below 0.92*VADJ

PG pin goes to low impedance. If the device works correctly, Power Good pin is at high

impedance.

If the output voltage is fixed using an external or internal resistor divider, Power Good

threshold is 0.92*VO.

To use Power Good function, an external pull-up resistor is required, and it has to be

connected between PG pin and VI or VO. PG pin typical current capability is up to 6 mA. A

pull-up resistor in the range of 100 k

Ω to 1 MΩ is recommended. If Power Good function is

not used, PG pin has to remain floating.

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