LDL112 datasheet(9/32 Pages) STMICROELECTRONICS

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LDL112

Application information

DocID026319 Rev 2

9/32

Application information

6.1

Thermal and short-circuit protections

The LDL112 is self-protected from short-circuit condition and overtemperature. When the

output load is higher than the one supported by the device, the output current increases

until the limit of typically 2 A is reached, at this point the current is kept constant even when

the load impedance is zero.

Thermal protection acts when the junction temperature reaches 165 °C, therefore the IC

shuts down. As soon as the junction temperature falls again below the thermal hysteresis

value the device starts working again.

In order to calculate the maximum power that the device can dissipate, keeping the junction

temperature below the TOP , the following formula is used:

Equation 1

6.2

Output voltage setting for ADJ version

In the adjustable version, the output voltage can be set from 0.8 V up to the input voltage

minus the voltage drop across the pass transistor (dropout voltage), by connecting a

resistor divider between the ADJ pin and the output, thus allowing remote voltage sensing.

The resistor divider could be selected by the following equation:

Equation 2

It is recommended to use resistors with values in the rang

e of 10 kΩ to 50 kΩ. Lower

values can also be suitable, but current consumption increases.

DMAX = (125 - TAMB )/RTHJ A

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