Rainbow-electronics MAX1804 Manual do Utilizador descarregar pdf (Página 1)

General Description

The MAX1804 feedback integrator is designed to

improve voltage regulation in power-supply systems.

The device corrects line- and load-regulation problems,

and can be used to compensate for voltage drops in

power-management distribution lines.

The regulation set point is determined by an external

reference voltage applied at the ADJ pin. The differ-

ence between that reference and MAX1804 feedback is

integrated, and a correction current is applied to the

voltage regulator’s feedback.

The MAX1804’s four inputs allow voltage monitoring in

several local and remote locations to correct for distribu-

tion losses caused by long traces, connectors, and

switches. This eliminates the wasteful practice of perma-

nently adjusting the regulator’s output voltage high

enough to correct for worst-case voltage drops. This is

especially helpful in systems where the load current

varies widely and portions of the load are often shut down

or disconnected (for example, in notebook computers).

If a load switch is opened and the output voltage

sensed at one input falls, the MAX1804 automatically

disables that input and adjusts the regulator’s output

voltage to the lowest of remaining active inputs. If all

inputs are disabled, the OUT pin is in a high-imped-

ance state and makes no output voltage correction.

When SHDN is low, the MAX1804 draws less than 1µA

and its inputs and output are high impedance. The

MAX1804 is available in a 10-pin µMAX package, about

half the size of an 8-pin SOIC.

Features

♦ High Precision (±1% max Error)

♦ Low Power (25µA Supply Current)

♦ Automatic Input Disable

♦ Shutdown (1µA max Supply Current)

♦ Inputs and Outputs High Impedance in Shutdown

or When V+ = 0

♦ +2.7V to +5.5V Supply Range

♦ 2.8V to 5.5V Regulation Adjust Range

♦ Parallelable for More than Four Inputs

♦ 10-Pin µMAX Package

MAX1804

External Four-Input Feedback Integrator for

Power Supplies

________________________________________________________________ Maxim Integrated Products 1

19-1737; Rev 0; 7/00

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX1804EUB -40°C to +85°C 10 µMAX

Applications

Pin Configuration appears at end of data sheet.

Remote Feedback Regulators

High-Accuracy Regulators

Desktop/Notebook Computers

Servers and Workstations

Subnotebooks and PDAs

SYSTEM

SUPPLY

FBREF

COMP

ADJ

V+

SHDN

IN1

IN2

IN3

IN4

OUT

GND

OUT

TOP

BOTTOM

OUT

MAX1804

Typical Operating Circuit

1 2 3 4 5 6 ... 10 11

Power Supplies 1

Resumo do Conteúdo

Página 1 - Power Supplies

General DescriptionThe MAX1804 feedback integrator is designed toimprove voltage regulation in power-supply systems.The device corrects line- and load

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MAX1804External Four-Input Feedback Integrator forPower Supplies10 ___________________________________________________________________________________

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Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses arei

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MAX1804External Four-Input Feedback Integrator forPower Supplies2 ____________________________________________________________________________________

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MAX1804External Four-Input Feedback Integrator forPower Supplies______________________________________________________________________________________

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ELECTRICAL CHARACTERISTICS (continued)(TA= -40°C to +85°C, VV+ = 3.3V, VADJ= 1.2V, VOUT= 2V, CV+ = 0.1µF, CCOMP= 470pF.) (Note 1)MAX1804External Four-

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MAX1804External Four-Input Feedback Integrator forPower Supplies______________________________________________________________________________________

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MAX1804External Four-Input Feedback Integrator forPower Supplies6 ____________________________________________________________________________________

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MAX1804External Four-Input Feedback Integrator forPower Supplies______________________________________________________________________________________

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MAX1804External Four-Input Feedback Integrator forPower Supplies8 ____________________________________________________________________________________

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MAX1804External Four-Input Feedback Integrator forPower Supplies______________________________________________________________________________________

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Rainbow-electronics MAX1804 Manual do Utilizador Página 1

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