SPX1581 Datasheet | Sipex

FEATURES - Low Dropout Voltage 500m V at 5A Full Load Current - Adjustable Ouput Down to 1.2V from ATX Power Supply - Fixed Output Voltages of 3.3V, 2.8V and 2.5V - Extremely Tight Load and Line Regulation - Standard 5-Terminal Low Cost TO-220 and TO-263 ADJ OR FIXED SENSE VCNTRL VOUT VIN 5 Pin TO-263 5 Pin TO-220 1 2 3 4 5 1 2 3 4 5 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" puter Systems ADJ OR FIXED SENSE Now Available in Lead Free Packaging DESCRIPTION The SPX1581 is a 5A 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 SPX1581 features a low dropout of 400m V(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 1m V. 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 SPX1581 is also an excellent choice as a post regulator for switching supplies applications. The SPX1581 offers protection against over-current faults, reversed input polarity, over temperature operation and positive and negative transient voltage. The SPX1581 is offered in a 5 pin TO-220 and TO-263 patible with industry standard 5-terminal regulators. For 7A, 3A and 1.5A ultra low dropout versions refer to SPX1580, SPX1582 and SPX1583 data sheets respectively. TYPICAL APPLICATIONS CIRCUIT 3.3V VIN 5V VCTRL VIN C1 330µF VCTRL 5 SPX1581 4 2 ADJ C2 10µF C3 .033µF R2 124Ω 1 SENSE R1 124Ω C4 2x330µF 3 VOUT 2.5V VOUT 3.3V...