SE5508-3.0 データシートの表示（PDF） - Seaward Electronics Inc.

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SE5508-3.0

150mA CMOS Low Noise LDO Voltage Regulator

Seaward Electronics Inc. 

150mA CMOS Low Noise

LDO Voltage Regulator

(Preliminary)

SE5508

Application Hints

Like any low dropout regulator, SE5508 requires

external capacitors to ensure stability. The

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 VOUT

pin, and connected directly between VOUT and GND

pins. The minimum value is 1μF but may be

increase without limit.

Application Diagram

Thermal Considerations

It is important that the thermal limit of the package is

not exceeded. The SE5508 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

PD = IOUT * [VIN – VOUT]

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 230°C/W for SE5508. SE5508 is

designed to enter thermal protection at 150°C. For

example, if TA is 25°C then the maximum PD is

limited to about 0.6W. In other words, if IOUT(MAX) =

150mA, then [VIN – VOUT] cannot exceed 3.6V.

Block Diagram

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

© Seaward Electronics, Inc., 2005. • www.seawardinc.com.cn • Page 5

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