SE8117 Datasheet, PDF (4/8 Pages) List of Unclassifed Manufacturers – 1A Positive Voltage Regulators

Application Hints
The typical Linear regulator would require
external capacitors to ensure stability. However,
SE8117 is designed in such a way that these
external capacitor can be omitted if the PCB
layout is tight and system noise is not very high.
For better transient and PSRR performance, the
Input and Output capacitors are still
recommended.
Input Capacitor
An input capacitor of 10μF is recommended.
Ceramic or Tantalum can be used. The value
can be increased without upper limit.
Output Capacitor
An output capacitor of 22uF is recommended for
better transient and PSRR performance. It
should be placed no more than 1 cm away from
the V_OUT pin, and connected directly between
V_OUT and GND pins. The value may be
increased without upper limit.
Thermal Considerations
It is important that the thermal limit of the package
is not exceeded. The SE8117 has built-in
thermal protection. When the thermal limit is
exceeded, the IC will enter protection, and V_OUT
will be pulled to ground. The power dissipation
for a given application can be calculated as
following:
The power dissipation (P_D) is
P_D = I_OUT * [V_IN – V_OUT]
The thermal limit of the package is then limited to
P_D(MAX) = [T_J – T_A]/Θ_JA where T_J is the junction
temperature, TA is the ambient temperature, and
Θ_JA is around 120°C/W for SE8117. SE8117 is
designed to enter thermal protection at 125°C.
For example, if T_A is 25°C then the maximum P_D
is limited to about 0.83W. In other words, if
I_OUT(MAX) = 500mA, then [V_IN – V_OUT] can not
exceed 1.66V. (Ref. SOT223 without heat sink.)
Revision 11/11/2013
Preliminary and all contents are subject to change without prior notice.
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