SPX3819M5-L-5-0-TR datasheet(7/13 Pages) EXAR

Part #	SPX3819M5-L-5-0-TR

Description	500mA Low-Noise LDO Voltage Regulator

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Manufacturer	EXAR [Exar Corporation]

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7 / 13 page

SPX3819

500mA Low-Noise LDO Voltage Regulator

7/12

Rev. 2.0.3

Fig. 15 Output Noise vs Bypass Capacitor Value IL = 10mA,

10Hz - 100kHz

Fig. 16 Line Transient Response for 3.3V Device

Fig. 17 Load Transient Response for 3.3V Device

APPLICATION INFORMATION

The SPX3819 requires an output capacitor for

device stability. Its value depends upon the

application circuit. In general, linear regulator

stability decreases with higher output currents.

In applications where the SPX3819 is sourcing

less current, a lower output capacitance may be

sufficient. For example, a regulator outputting

only 10mA, requires approximately half the

capacitance as the same regulator sourcing

150mA.

Bench testing is the best method for

determining the proper type and value of the

capacitor

since

the

high

frequency

characteristics of electrolytic capacitors vary

widely, depending on type and manufacturer. A

high quality 2.2μF aluminum electrolytic

capacitor works in most application circuits, but

the same stability often can be obtained with a

1μF tantalum electrolytic.

With the SPX3819 adjustable version, the

minimum value of output capacitance is a

function of the output voltage. The value

decreases with higher output voltages, since

closed loop gain is increased.

TYPICAL APPLICATIONS CIRCUITS

A 10nF capacitor on the BYP pin will significantly

reduce output noise, but it may be left

unconnected if the output noise is not a major

concern. The SPX3819 start-up speed is

inversely proportional to the size of the BYP

capacitor. Applications requiring a slow rampup

of the output voltage should use a larger CBYP.

However, if a rapid turn-on is necessary, the

BYP capacitor can be omitted.

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SPX3819M5-L-5-0-TR Datasheet(PDF) 7 Page - Exar Corporation

SPX3819M5-L-5-0-TR Datasheet(HTML) 7 Page - Exar Corporation

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