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SPX1581T

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

Signal Processing Technologies 

SPX1581

5A Ultra Low Dropout Voltage Regulator

Fast Response, Adjustable & Fixed

FEATURES

• Low Dropout Voltage 500mV at 5A Full Load Current

• Adjustable Output Down to 1.2V from ATX Power Supply

• Fixed Output Voltages of 3.3V, 2.8V & 2.5V

• Extremely Tight Voltage and Line Regulation

• Standard 5-Terminal Low Cost TO-220 & TO-263

APPLICATIONS

• 3.3V to 2.8V ATX Power Supplies

• 3.3V to 2.9V for Portable PENTIUM Processor

• 5V to 3.5V VRE Supply

• High Efficiency “Green” Computer Systems

PRODUCT 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 less than 400mV(typ.) and offers fast transient response. This device is suitable

for Pentium applications requiring 2.8V or 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 in 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 full 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 compatible 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.

PIN CONNECTIONS

TO-263-5 (T)

SPX1581

12 34 5

Top View

1. SENSE

2. ADJ or FIXED

3. VOUT

4. VCTRL

5. VIN

TO-220-5 (U)

SPX1581

1 2 3 45

1. SENSE

2. ADJ or FIXED

3. VOUT

4. VCTRL

5. VIN

Front View

Rev.10/30/00

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