SE5221ADLG-LF SEAWARD [Seaward Electronics Inc.], SE5221ADLG-LF Datasheet - Page 6

• Manufacturer Part Number: SE5221ADLG-LF
• Description: Dual 200mA CMOS LDO Voltage Regulator
• Manufacturer: SEAWARD [Seaward Electronics Inc.]

Revision 9/4/2008
Application Hints
Like any low dropout regulator, SE5221 requires
external capacitors to ensure stability.
external capacitors must be carefully selected to
ensure performance.
Input Capacitor
An input capacitor of at least 1μF is required.
Electrolytic or Ceramic or Tantalum can be used.
The value can be increased without upper limit.
Output Capacitor
An output capacitor is required for stability.
must be placed no more than 1 cm away from the
V
and GND pins.
Tantalum can be used. The minimum value is
1μF but may be increased without limit.
OUT
pin, and connected directly between V
Preliminary and all contents are subject to change without prior notice
Electrolytic or Ceramic or
© Seaward Electronics Inc., 2007. • www.seawardinc.com • Page 6
LDO Voltage Regulator
Dual 200mA CMOS
The
OUT
(Preliminary)
It
Thermal Considerations
It is important that the thermal limit of the package
is not exceeded.
thermal protection.
exceeded, the IC will enter protection, and V
will be gradually pulled to ground as load
continued to increase. The power dissipation for
a given application can be calculated as following:
The power dissipation (P
P
The thermal limit of the package is then limited to
P
temperature, TA is the ambient temperature, and
Θ
SE5221 is designed to enter thermal protection at
120°C.
maximum P
words, if I
cannot exceed 2V.
D
D(MAX)
JA
= I
for SOT-23-6 is around 230°C/W for SE5221.
OUT
= [T
* [V
For example, if T
OUT(MAX)
J
D
IN
– T
is limited to about 0.4W. In other
– V
A
OUT
]/Θ
= 200mA, then [V
]
JA
When the thermal limit is
The SE5221 has built-in
where T
D
) is
A
is 25°C then the
J
is the junction
SE5221
IN
– V
OUT
OUT
]