TPS76901, TPS76912, TPS76915, TPS76918, TPS76925
TPS76927, TPS76928, TPS76930, TPS76933, TPS76950
ULTRALOW-POWER 100-mA LOW-DROPOUT LINEAR REGULATORS
SLVS203D – JUNE 1999 – REVISED APRIL 2000
APPLICATION INFORMATION
power dissipation and junction temperature
Specified regulator operation is assured to a junction temperature of 125°C; the maximum junction temperature
should be restricted to 125°C under normal operating conditions. This restriction limits the power dissipation
the regulator can handle in any given application. To ensure the junction temperature is within acceptable limits,
calculate the maximum allowable dissipation, P
, and the actual dissipation, P , which must be less than
D(max)
D
or equal to P
.
D(max)
The maximum-power-dissipation limit is determined using the following equation:
T max
J
T
A
P
D(max)
R
JA
Where:
T max is the maximum allowable junction temperature
J
R
is the thermal resistance junction-to-ambient for the package, i.e., 285°C/W for the 5-terminal
θJA
SOT23.
T is the ambient temperature.
A
The regulator dissipation is calculated using:
P
V
V
I
D
I
O
O
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation will trigger the
thermal protection circuit.
regulator protection
The TPS769xx PMOS-pass transistor has a built-in back diode that conducts reverse current when the input
voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the
input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting might
be appropriate.
The TPS769xx features internal current limiting and thermal protection. During normal operation, the TPS769xx
limits output current to approximately 350 mA. When current limiting engages, the output voltage scales back
linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device failure,
care should be taken not to exceed the power dissipation ratings of the package. If the temperature of thedevice
exceeds approximately 165°C, thermal-protection circuitry shuts it down. Once the device has cooled down to
below approximately 140°C, regulator operation resumes.
14
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