Preliminary and all contents are subject to change without prior notice.
5
150mA CMOS LDO
Regulator
(Preliminary)
CYT6166
Application Hints
Like any low dropout regulator,
CYT6166 requires
external capacitors to ensure stability.
The
external capacitors must be carefully selected to
ensure performance.
Thermal Considerations
It is important that the thermal limit of the package is
not exceeded. The
CYT6166 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 250°C/W for CYT6166. CYT6166 is
designed to enter thermal protection at 150°C. For
example, if TA is 25°C then the maximum PD is
limited to about 0.5W. In other words, if IOUT(MAX) =
150mA, then [VIN – VOUT] cannot exceed 3.33V.
Input Capacitor
An input capacitor of at least 2.2µF 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 2.2µF but may be
increase without limit.
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