Datasheet

TPS2511
SLUSB18 –JUNE 2012 www.ti.com
Thermal Sense
The TPS2511 provides thermal protection from two independent thermal sensing circuits that monitor the
operating temperature of the power distribution switch and turn off for 12 seconds (typ) if the temperature
exceeds recommended operating conditions. The device operates in constant-current mode during an over-
current condition and OUT pin voltage is above 3.8 V (typ), which has a relatively large voltage drop across
power switch. The power dissipation in the package is proportional to the voltage drop across the power switch,
so the junction temperature rises during the over-current condition. The first thermal sensor turns off the power
switch when the die temperature exceeds 135°C and the device is within the current limit. The second thermal
sensor turns off the power switch when the die temperature exceeds 155°C regardless of whether the power
switch is in current limit. Hysteresis is built into both thermal sensors, and the switch turns on after the device
has cooled approximately 10°C. The switch continues to cycle off and on until the fault is removed.
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