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SPX1582 Fiches technique(PDF) 1 Page - Sipex Corporation |
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SPX1582 Fiches technique(HTML) 1 Page - Sipex Corporation |
1 / 7 page 1 Date:5/25/04 SPX1582 3A Ultra Low Dropout Voltage Regulator ©Copyright 2004 Sipex Corporation SPX1582 DESCRIPTION FEATURES ■ Low Dropout Voltage 500mV at 3A Full Load Current ■ Adjustable Ouput Down to 1.25V from ATX Power Supply ■ Fixed Output Voltages of 3.3V and 2.5V ■ Extremely Tight Load and Line Regulation ■ Standard 5-Terminal Low Cost TO-220 and TO-263 ® The SPX1582 is a 3A Low Dropout Regulator with extremely low dropout voltage. The adjustable version requires only two external resistors to set the output voltage. The fixed version has a preset output of 3.3V, 2.8V or 2.5V and does not require any external resistors. The SPX1582 features a low dropout of 400mV(Typ.) and offers fast transient response. This device is suitable for Pentium applications requiring 2.8V, 2.5V from 3.3V ATX power supplies, where a low current input voltage 1V greater than the output voltage is needed. With an external sense pin the load regulation is less than 1mV. This device is an excellent choice for the use of powering low voltage microprocessors that require a lower dropout, fast transient response to regulate from 3.3V and 5V supplies. The SPX1582 is also an excellent choice as a post regulator for switching supplies applications. The SPX1582 offers protection against over-current faults, reversed input polarity, over temperature operation and positive and negative transient voltage. The SPX1582 is offered in a 5 pin TO-220 and TO-263 compatible with industry standard 5-terminal regulators. For 5A, 3A and 1.5A ultra low dropout versions refer to SPX1581, SPX1582 and SPX1583 data sheets respectively. 3A Ultra Low Dropout Voltage Regulator Fast Response, Adjustable & Fixed APPLICATIONS ■ 3.3V to 2.8V ATX Power Supplies ■ 3.3V to 2.9V for Portable PENTIUMTM Processor ■ 5V to 3.5V VRE Supply ■ High efficiency "Green" Computer Systems 12 3 SPX1582 5 Pin TO-263 3 2 1 SPX1582 5 Pin TO-220 4 5 C4 2x330µF 2.5V VOUT R1 124Ω R2 124Ω VOUT SENSE C2 10µF VCTRL C1 330µF 3.3V VIN 5V VCTRL SPX1582 5 4 2 3 1 (1) VCTRL needed when VIN < 5V. (2) VOUT = VREF (1+R2/R1)+IADJ R2. (3) VREF is measured across adjust to sense. ADJ VIN C3 .033µF C4 2x330µF 2.5V VOUT VOUT SENSE C2 10µF VCTRL C1 330µF 3.3V VIN 5V VCTRL SPX1582 5 4 2 3 1 (1) VCTRL needed when VIN < 5V. GND VIN Typical Fixed Regulator Adjustable Regulator TYPICAL APPLICATIONS CIRCUIT Now Available in Lead Free Packaging |
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