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SPX1581T-3.3 Datasheet(PDF) 4 Page - Sipex Corporation |
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SPX1581T-3.3 Datasheet(HTML) 4 Page - Sipex Corporation |
4 / 5 page 4 Date 5/25/04 SPX1581 5A Ultra Low Dropout Voltage Regulator ©Copyright 2004 Sipex Corporation 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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