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SE5121 Datasheet(PDF) 4 Page - Seaward Electronics Inc.

Part No. SE5121
Description  600mA CMOS Low Power Low Noise LDO Voltage Regulator
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Maker  SEAWARD [Seaward Electronics Inc.]
Homepage  http://www.seawardinc.com

SE5121 Datasheet(HTML) 4 Page - Seaward Electronics Inc.

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Revision 12/4/2008
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics Inc., 2005. • www.seawardinc.com.cn • Page 4
600mA CMOS Low Power Low
Noise LDO Voltage Regulator
Application Hints
Like any low dropout regulator, SE5121 requires
external capacitors to ensure stability.
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 SE5121 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
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 180°C/W for SE5121. SE5121 is
designed to enter thermal protection at 150°C. For
example, if TA is 25°C then the maximum PD is
limited to about 0.7W. In other words, if IOUT(MAX) =
600mA, then [VIN – VOUT] cannot exceed 1.7V.
Input Capacitor
An input capacitor of at least 1μF is required. The
inexpensive Electrolytic capacitor is preferred.
The value can be increased 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
The inexpensive Electrolytic capacitor is
recommended. The minimum value is 1μF but may
be increased without limit.

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