L1581-3.3 Просмотр технического описания (PDF) - Niko Semiconductor

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L1581-3.3

Dual Input Ultra Low Dropout Voltage Regulator (ULDO) TO-220,TO-263

Niko Semiconductor 

NIKO-SEM

Dual Input Ultra Low Dropout

Voltage Regulator (ULDO)

L1581 Series

TO-220,TO-263

GENERAL DESCRIPTION

The L1581 is a positive and very low

dropout voltage regulator with 5A output

current capability. When supplying 2.5V or

2.8V on Motherboards or VGA Card where

both 5V and 3.3V supplies are available,

the superior dropout characteristics of the

L1581 result in reduced heat dissipation

compared to regular LDOs, thus allowing

heat sink reduction. The adjustable version

requires only two external resistors to set

the output. The L1581 features a low

dropout of less than 600mV and offers fast

transient response, remote sense, internal

limiting, thermal shutdown and safe

operating area protection of the output

device.

The L1581 is a five terminal adjustable

voltage regulator available in the popular 5

pin TO-220 and TO-263 packages.

FEATURES

z Low dropout voltage 600mV at rated load

current

z Remote sense operation

z Fast transient response

z 0.5% voltage reference initial accuracy

z Standard 5 terminal, Low cost TO-220

and TO-263 packages

APPLICATIONS

z 3.3V to 2.8V or 2.5V for Motherboards or

VGA Card

z Spilt plane microprocessor supplies

z Post regulator for switching supplies

TYPICAL APPLICATION

Adjustable Output Parts(2)

Vin

Vctrl

C1

330uF

C2

10uF

L1581X

5 Vin

4

CTR'L

OUT 3

1

SENSE

Vout

Iadj

C3

0.033uF

Vref

R1

R2

C4

330uF

Vo = Vref (1+R2/R1) + Iadj x R2

1

JAN-08-Y02

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