CYT 6619
Application Hints
Like any Low dropout regulator,CYT6619 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 CYT6619 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 180°C/W for CYT6619. CYT6619
is designed to enter thermal protection at 150°C. For example, if TA is 25°C then the max PD is limited
to about 0.7W. In other words, if IOUT(MAX) = 500mA, then [VIN – VOUT] can not exceed 2.0V.
ShenZhen CYT IC Design CO ,Ltd
4
