SPX1582T-2.8 datasheet(3/5 Pages) SIPEX

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Date:5/25/04

SPX1582 3A Ultra Low Dropout Voltage Regulator

The SPX1582 is designed as a high performance

and low cost solution for application requiring a

lower dropout than traditional NPN regulators.

The SPX1582 uses a separate input voltage VCTRL

( VCTRL ≥ VOUT + 1.3V) to minimize the dropout

voltage. This allows the 2.5V power for the load

to come from a 3.3V system supply.

As added benefit this will reduce the heat dissi-

pation*, and lower heatsink and cooling fan cost.

A typical application would use 3.3V for VIN

and 5.0V for VCTRL from a motherboard power

supply to provide a nominal 2.5V output. Using

the sense pin allows Kelvin measure the output,

reducing resistance-associated errors.

The SPX1582 can power the 2.5V core voltage

for microprocessors such as a PentiumPCTM,

P55CTM, AMD5k86TM and K6TM and the IBM

PowerPCTM 603EV and 604EV processors.

CURRENT

LIMIT

AMPLIFIER

THERMAL OVERLOAD

VREF

VOLTAGE

REGULATION

AMPLIFIER

LIMIT

SENSE

(4) VCTRL

VIN (5)

VOUT (3)

SENSE (1)

ADJ (2)

PIN NUMBER

PIN NAME

DESCRIPTION

SENSE

Allows Kelvin sense of VOUT at the load. (Positive side of the

reference voltage of the device).

ADJ

Negative side of the reference voltage for the device. Adding a small

bypass capacitor from the ADJ pin to ground will improve the transient

response.

3VOUT

Power output of the device.

4VCTRL

Supply pin for the control circuitry of the device. The current flow into this

pin will be about 1% of the output current. VCTRL must be between 1.0V

and 1.3V greater than the output voltage for the

device to regulate.

5VIN

Output load current is supplied through this pin. VIN must be between 0.1V

and 0.8V greater than the output voltage for this device to regulate.

PIN DESCRIPTION

FUNCTIONAL DIAGRAM

APPLICATION NOTES

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