LT1581CT7-2.5 데이터 시트보기 (PDF) - Linear Technology

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LT1581CT7-2.5

10A, Very Low Dropout Regulators

Linear Technology 

LT1581/LT1581-2.5

10A, Very Low

Dropout Regulators

FEATURES

s Low Dropout, 430mV at 10A Output Current

s Fast Transient Response

s Remote Sense

s 1mV Load Regulation

s Fixed 2.5V Output and Adjustable Output

s No Supply Sequencing Problems in

Dual Supply Mode

U

APPLICATIONS

s Microprocessor Supplies

s Post Regulators for Switching Supplies

s High Current Regulators

s 5V to 3.XXV for Pentium® Processors Operating

at 90MHz to 166MHz and Beyond

s 3.3V to 2.9V for Portable Pentium Processor

s PowerPCTM Series Power Supplies

DESCRIPTION

The LT ®1581 is a 10A 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 430mV at 10A. 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 LT1581.

A remote SENSE pin is brought out. This feature virtually

eliminates output voltage variations due to load changes.

Typical load regulation for a load current step of 100mA to

10A, measured at the SENSE pin, is less than 1mV.

The LT1581 has fast transient response, equal to the

LT1584. On fixed voltage devices, the ADJUST pin is

brought out. A small capacitor on the ADJUST 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.

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

Pentium is a registered trademark of Intel Corporation.

PowerPC is a trademark of IBM Corporation.

TYPICAL APPLICATION

2.5V Microprocessor Supply

3.3V

10A +

POWER

330µF

OUTPUT

OS-CON

LT1581-2.5

5V

0.2A

+

10µF

CONTROL

GND

TANT

SENSE

ADJ

0.1µF

2.5V/10A

+ 100µF TANT

AVX TPS

×7

1581 TA01

Dropout Voltage –

Minimum Power Voltage

0.8

INDICATES GUARANTEED TEST POINTS

0.7

0.6

0.5

DATA SHEET LIMIT

0.4

0.3

TJ = 125°C

0.2

TJ = 25°C

0.1

0

0 1 2 3 4 5 6 7 8 9 10

OUTPUT CURRENT (A)

1581 G03

1

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