EC49124 datasheet(4/6 Pages) E-CMOS

4 / 6 page

EC49124

500mA Super LDO Linear Regulator

E-CMOS Corp. (www.ecmos.com.tw)

Page 4 of 6

4I05N-Rev.F001

Application Hints

Like any Low dropout regulator, EC49124 requires external capacitors to ensure stability. The external capacitors must

be carefully selected to ensure the performances.

Input Capacitor:

An Input Capacitor of at least 2.2uF is required. The inexpensive Electrolytic capacitor is preferred. The value can be

increased without upper limit.

Output Capacitor:

An Output Capacitor is required for look stability. It must be located no more than 1cm away from the VOUT pin, and

connected directly between VOUT and GND pins. The inexpensive Electrolytic capacitor is recommended. The minimum

value is 2.2uF but once again its value can be increased without limit.

Thermal Consideration

It is important that the thermal limit of the package should not be exceeded. The EC49124 has built-in thermal protection.

When the thermal limit is exceeded, the IC will enter protection, and the VOUT will be reset to zero. The power

dissipation for a given application can be calculated as follows:

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

ambient temperature, and θJA is around 180°C/W for EC49124. EC49124 is designed to enter thermal protection at

150°C. For example, if TA is 25°C then the max PD is limited to about 0.7W.

In other words, if IOUT(MAX) = 500mA, then [VIN

–VOUT] can not exceed 1.4V.

EC49124 Datasheet(PDF) 4 Page - E-CMOS Corporation