SPX1581 datasheet(4/7 Pages) SIPEX

Part #	SPX1581

Description	5A Ultra Low Dropout Voltage Regulator Fast Response, Adjustable & Fixed

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Manufacturer	SIPEX [Sipex Corporation]

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Date 5/25/04

SPX1581 5A Ultra Low Dropout Voltage Regulator

Adjustable Regulator Design

1.25V reference voltage is being developed be-

tween the SENSE pin and the ADJ pin of the

SPX1581. Adding two external resistors (see fig

1.) will allow setting the output voltage from

1.25V to 6V. R1 is chosen so that this current is

specified minimum load current of 10mA. R2 is

given by the formula: VOUT = VREF (1+ R2/R1)

+ IADJ (R2). The current flowing from the ADJ

pin is typicaly 50

µA. This ADJ pin contributes

to the final VOUT but is usually neglected.

Connecting the sense pin to the top of the resis-

tor divider will improve load regualtion.

Lowering Noise

Using the SENSE pin to Kelvin the load will

increase accuracy of the output voltage during

load regulation. For the fixed voltage device,

adding a capacitor at the GND pin will improve

transient response. This capacitor is chosen in

the range of 1

µF to 0.1µF and will depend on the

amount of output capacitance in the system.

APPLICATION NOTES: Continued

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