SE5218ALG-LF SEAWARD [Seaward Electronics Inc.], SE5218ALG-LF Datasheet - Page 6

• Manufacturer Part Number: SE5218ALG-LF
• Description: 500mA CMOS LDO Voltage Regulator
• Manufacturer: SEAWARD [Seaward Electronics Inc.]

Revision 12/5/2008
Application Hints
Like any low dropout regulator, SE5218 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. The
inexpensive Electrolytic capacitor is preferred.
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. The inexpensive Electrolytic
capacitor is recommended. 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.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com.cn • Page 6
500mA CMOS LDO Voltage Regulator
The
OUT
It
(Preliminary)
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 pulled to ground. 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
SE5218. SE5218 is designed to enter thermal
protection at 150°C. For example, if T
then the maximum P
In other words, if I
V
D
D(MAX)
OUT
JA
= I
] cannot exceed 1.5V.
for SOT-23-5L is around 230°C/W for
OUT
= [T
* [V
J
IN
– T
– V
A
OUT
]/Θ
OUT(MAX)
]
JA
D
When the thermal limit is
The SE5218 has built-in
is limited to about 0.6W.
where T
D
) is
= 400mA, then [V
J
is the junction
SE5218
A
is 25°C
IN
OUT
–