CYT 6118
temperature, and the regulator will go into thermal shutdown. See Table 1 and the “Thermal Considerations”
section for details.
Note 4: Output voltage temperature coefficient is the worst-case voltage change divided by the total temperature
range.
Note 5: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested
for load regulation in the load range from 100µA to 500mA. Changes in output voltage due to heating effects
are covered by the thermal regulation specification.
Note 6: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its
nominal value measured at 1V differential.
Application Hints
Like any Low dropout regulator, CYT6118 requires external capacitors to ensure stability. The external capacitors
must be carefully selected to ensure the performances.
Input Capacitor:
An Input Capacitor of at least 10uF is required. Ceramic or Tantalum can be used. The value can be
increased without upper limit.
Output Capacitor:
An Output Capacitor is required for look stability. It must be located no more than 1cm away
from the VOUT pin, and connected directly between VOUT and GND pins. The minimum value is
10uF but once again its value can be increased without limit.
Thermal Consideration
It is important that the thermal limit of the package should not be exceeded. The CYT6118 has
built-in thermal protection. When the thermal limit is exceeded, the IC will enter protection, and the
VOUT will be reset to zero. The power dissipation for a given application can be calculated as follows:
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 ambient temperature, and θJA is around 120°C/W for CYT6118.
CYT6118 is designed to enter thermal protection at 150°C. For example, if TA is 25°C then the
max PD is limited to about 1W. In other words, if IOUT(MAX) = 500mA, then [VIN – VOUT] can not
exceed 2.1V.
ShenZhen CYT IC Design CO ,Ltd
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