CYT 8117
Absolute Maximum Rating
Parameter
Symbol
Value
Units
Input Supply Voltage
VIN
9
V
Thermal Resistance,
ӨJA
60
℃/W
Junction-to-Ambient SOT-223
Lead Temperature (Soldering,10 sec.)
Operating Junction Temperature Range
Storage Temperature Range
TLEAD
TJ
260
℃
℃
℃
0 to +125
-40 to +150
TSTG
Application Hints
Like any linear voltage regulator, CYT8117 requires external capacitors to ensure stability. The
external capacitors must be carefully selected to ensure performance.
Input Capacitor
An input capacitor of at least 10µF is required. Ceramic or Tantalum can be used. The value can be
increase without upper limit.
Output Capacitor
An output capacitor is required for stability. It must be placed no more than 1 cm away from the
VOUT pin, and connected directly between VOUT and GND pins. The minimum value is 22µF but may
be increase without limit.
Thermal Considerations
It is important that the thermal limit of the package is not exceeded. The CYT8117 has built-in
thermal protection. When the thermal limit is exceeded, the IC will enter protection, and VOUT will be
pulled to ground. The power dissipation for a given application can be calculated as following: The power
dissipation (PD) is
PD = IOUT * [VIN – VOUT]
The thermal limit of the package is then limited to PD(MAX) = [TJ – TA]/ΘJA where TJ is the
junction temperature, TA is the ambient temperature, and ΘJA is around 60°C/W for CYT8117.CYT8117
is designed to enter thermal protection at 175°C. For example, if TA is 25°C then the maximum PD is
limited to about 2.5W. In other words, if IOUT(MAX) = 1A, then [VIN – VOUT] cannot exceed 2.5V.
ShenZhen CYT IC Design CO ,Ltd
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