Revision

4/19/2016

Preliminary and all contents are subject to change without prior notice.

© Seaward Electronics, Inc., 2005. • www.seawardinc.com • Page 6

500mA CMOS LDO Voltage Regulator

(Preliminary)

SE5218

Application Hints

Like any low dropout regulator, SE5218 requires

external capacitors to ensure stability.

The

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 SE5218 has built-in

thermal protection.

When the thermal limit is

will be pulled to ground.

The power dissipation

for a given application can be calculated as

following:

The thermal limit of the package is then limited to

]/Θ

temperature, TA is the ambient temperature, and

Θ

JA

for SOT-23-5L is around 230°C/W

for

SE5218.

SE5218 is designed to enter thermal

protection at 150°C.

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

and GND pins. The minimum value is 1μF but

may be increase without limit.