SPX1580U5-L Exar Corporation, SPX1580U5-L Datasheet

IC, ADJ LDO REG, 1.25V TO 6V 7A TO-220-5

SPX1580U5-L

Manufacturer Part Number

SPX1580U5-L

Description

IC, ADJ LDO REG, 1.25V TO 6V 7A TO-220-5

Manufacturer

Exar Corporation

Datasheet

1.SPX1580T5-L.pdf (8 pages)

Specifications of SPX1580U5-L

Primary Input Voltage

12V

Output Voltage Adjustable Range

1.25V To 6V

Output Voltage Fixed

3.3V

Dropout Voltage Vdo

540mV

No. Of Pins

Output Current

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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FEATURES

■ Low Dropout Voltage 540mV at 7A 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

■ Replacement to Industry Standard LT1580

3.3V

The SPX1580 is a 7A 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

or 2.5V and does not require any external resistors. The SPX1580 features a low dropout of 540mV(Typ.)

and offers fast transient response. This device is suitable for Pentium applications requiring 2.5V from 3.3V

ATX power supplies, where a low current input voltage 1V greater than the output voltage is available. 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 SPX1580 is also an excellent choice as a post regulator for switching

supplies applications.

The SPX1580 offers protection against over-current faults, reversed input polarity, over temperature

operation and positive and negative transient voltage.

The SPX1580 is offered in a 5 pin TO-220 and TO-263 compatible with industry standard 5-terminal

regualtors. For 5A, 3A and 1.5A ultra low dropout versions refer to SPX1581, SPX1582 and SPX1583 data

sheets respectively.

APPLICATIONS

■ 3.3V ATX Power Supplies

■ 3.3V to 2.9V for Portable PENTIUM

■ 5V to 3.5V VRE Supply

■ High efficiency "Green" Computer Systems

CTRL

Date: 5/16/04

33µF

CTRL

10µF

(1) V

(2) V

(3) V

SPX1580

CTRL

OUT

REF

ADJ

is measured across adjust to sense.

= V

needed when V

REF

(1+R

SENSE

OUT

Processor

SPX1580 7A Ultra Dropout Voltage Regulator

)+I

< 5V.

ADJ

124Ω

7A Ultra Dropout Voltage Regulator

68µF

2.5V

OUT

3.3V

Fast Response, Adjustable & Fixed

CTRL

Now Available in Lead Free Packaging

TYPICAL APPLICATIONS CIRCUITS

5 Pin TO-220

SPX1580

33µF

CTRL

10µF

4 5

(1) V

SPX1580

CTRL

GND

needed when V

SPX1580

DESCRIPTION

OUT

SENSE

SPX1580

5 Pin TO-263

< 5V.

68µF

2.5V

OUT

Related parts for SPX1580U5-L

SPX1580U5-L Summary of contents

Page 1

FEATURES ■ Low Dropout Voltage 540mV at 7A 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 ...

Page 2

Power Dissipation ..................................... Internally Limited Lead Temp. (Soldering, 10 Seconds) ......................... 300°C Storage Temperature Range ..................... -65°C to +150°C Operating Junction Temperature Range SPX1580 Control Section ............................. 0°C to +125°C SPX1580 Power Transistor .......................... 0°C to +150°C Electrical characteristics at ...

Page 3

...

Page 4

Output Capacitor An output capacitor for SPX1580 is for circuit compensation for the device to prevent oscilliation. The minimum size of the output capacitor is either a 330µF aluminum electro- lytic capacitor or 33uF tantalum. Larger capaci- tor values improve ...

Page 5

V 3. CTRL C1 33µF Figure 2. Typical Fixed Regulator. Date: 5/16/ OUT 5 3 SPX1580 CTRL SENSE GND C2 10µF (1) V needed when V CTRL IN SPX1580 7A ...

Page 6

E E Dimensions in 5 PIN TO-220 (inches) MIN NOM MAX A .160 - .190 b .015 - .040 C1 .014 - .022 .560 - .590 D .385 - ...

Page 7

PIN TO-263 Dimensions in (mm) JEDEC TO-263 (BB) Variation MIN NOM MAX A .160 - .020 - c .015 - c2 .045 D1 .270 E ...

Page 8

... Part Number SPX1580U5 ................................................ -40°C to +85°C ........................................................ 5 Pin TO-220 SPX1580U5-2.5 .......................................... -40°C to +85°C ....................................................... 5 Pin TO-220 SPX1580U5-3.3 .......................................... -40°C to +85°C ....................................................... 5 Pin TO-220 SPX1580T5 ................................................ -40°C to +85°C ........................................................ 5 Pin TO-263 SPX1580T5/TR .......................................... -40°C to +85°C ........................................................ 5 Pin TO-263 SPX1580T5-2.5 .......................................... -40°C to +85°C ....................................................... 5 Pin TO-263 SPX1580T5-2.5/TR .................................... -40°C to +85°C ....................................................... 5 Pin TO-263 SPX1580T5-3.3 .......................................... -40° ...

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