se5508 seawardinc, se5508 Datasheet - Page 6

• Manufacturer Part Number: se5508
• Description: 150ma Cmos Low Noise Ldo Voltage Regulator
• Manufacturer: seawardinc

Application Hints
Like any low dropout regulator, SE5508 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.
Ceramic or Tantalum can be used. The value can
be increase without upper limit.
Output Capacitor
An output capacitor is required for stability. It must
be placed no more than 1 cm away from the V
pin, and connected directly between V
pins.
increase without limit.
The minimum value is 1µF but may be
SEAWARD
ELECTRONICS
Preliminary and all contents are subject to change without prior notice.
© Seaward Electronics, Inc., 2005. • www.seawardinc.com • Page 6
OUT
150mA CMOS Low Noise
LDO Voltage Regulator
and GND
(Preliminary)
The
OUT
Thermal Considerations
It is important that the thermal limit of the package is
not exceeded. The SE5508 has built-in thermal
protection.
the IC will enter protection, and V
to ground.
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
designed to enter thermal protection at 150°C. For
example, if T
limited to about 0.6W. In other words, if I
150mA, then [V
D
D(MAX)
JA
= I
is around 230°C/W for SE5508. SE5508 is
OUT
= [T
* [V
J
When the thermal limit is exceeded,
IN
The power dissipation for a given
A
– T
– V
IN
is 25°C then the maximum P
– V
OUT
A
]/Θ
OUT
]
JA
] cannot exceed 3.6V.
D
where T
) is
OUT
J
is the junction
will be pulled
SE5508
OUT(MAX)
D
is
=