LT1580-2.5 Linear Technology, LT1580-2.5 Datasheet

LT1580-2.5

Manufacturer Part Number

LT1580-2.5

Description

7A/ Very Low Dropout Regulator

Manufacturer

Linear Technology

Datasheet

1.LT1580-2.5.pdf (16 pages)

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APPLICATIONS

FEATURES

TYPICAL

3.3V

0.2A

Low Dropout, 540mV at 7A Output Current

Fast Transient Response

Remote Sense

1mV Load Regulation

Fixed 2.5V Output and Adjustable Output

No Supply Sequencing Problems in

Dual Supply Mode

Microprocessor Supplies

Post Regulators for Switching Supplies

High Current Regulators

5V to 3.XXV for Pentium

at 90MHz to 166MHz and Beyond

3.3V to 2.9V for Portable Pentium Processor

PowerPC

330 F

OS-CON

10 F

TANT

APPLICATION

Series Power Supplies

2.5V Microprocessor Supply

GND

POWER

CONTROL

LT1580-2.5

SENSE

ADJ

Processors Operating

OUT

0.1 F

2.5V/7A

100 F TANT

AVX TPS

1580 TA01

DESCRIPTION

The LT ®1580 is a 7A low dropout regulator designed to

power the new generation of microprocessors. The drop-

out voltage of this device is 100mV at light loads rising to

just 540mV at 7A. To achieve this dropout, a second low

current input voltage 1V greater than the output voltage, is

required. The device can also be used as a single supply

device where dropout is comparable to an LT1584.

Several other new features have been added to the LT1580.

A remote SENSE pin is brought out. This feature virtually

eliminates output voltage variations due to load changes.

Typical load regulation, measured at the SENSE pin, for a

load current step of 100mA to 7A is less than 1mV.

The LT1580 has fast transient response, equal to the

LT1584. On fixed voltage devices, the ADJ pin is brought

out. A small capacitor on the ADJ pin further improves

transient response.

This device is ideal for generating processor supplies of

2V to 3V on motherboards where both 5V and 3.3V

supplies are available.

Pentium is a registered trademark of Intel Corporation.

PowerPC is a trademark of IBM Corporation.

, LTC and LT are registered trademarks of Linear Technology Corporation.

1.0

0.5

Dropout Regulator

INDICATES GUARANTEED TEST POINTS

0 C T

Minimum Power Voltage

Dropout Voltage —

OUTPUT CURRENT (A)

LT1580/LT1580-2.5

DATA SHEET LIMIT

125 C

7A, Very Low

= 25 C

= 125 C

1580 G03

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