CYT6119
400mA CMOS LDO Regulator
Note 1: Exceeding the absolute maximum rating may damage the device.
Note 2: The device is not guaranteed to function outside its operating rating.
Note 3: The maximum allowable power dissipation at any TA (ambient temperature) is calculated using: PD(MAX)
= (TJ(MAX) - TA)/θJA. Exceeding the maximum allowable power dissipation will result in excessive die
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
Thermal Consideration
Like any Low dropout regulator,CYT6119 requires
external capacitors to ensure stability. The external
capacitors must be carefully selected to ensure the
performances..
It is important that the thermal limit of the
package should not be exceeded. The
CYT6119 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:
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.
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
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.
temperature, and θJA is around 180°C/W for
CYT6119. CYT6119 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) = 400mA,
then [VIN – VOUT] can not exceed 1.75V.
ShenZhen CYT IC Design CO ,Ltd
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