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General Description

The MAX5080/MAX5081 are 250kHz PWM step-down

DC-DC converters with an on-chip, 0.3Ω high-side

switch. The input voltage range is 4.5V to 40V for the

MAX5080 and 7.5V to 40V for the MAX5081. The output

is adjustable from 1.23V to 32V and can deliver up to

1A of load current.

Both devices utilize a voltage-mode control scheme for

good noise immunity in the high-voltage switching envi-

ronment and offer external compensation allowing for

maximum flexibility with a wide selection of inductor val-

ues and capacitor types. The switching frequency is

internally fixed at 250kHz and can be synchronized to

an external clock signal through the SYNC input. Light

load efficiency is improved by automatically switching

to a pulse-skip mode.

All devices include programmable undervoltage lock-

out and soft-start. Protection features include cycle-by-

cycle current limit, hiccup-mode output short-circuit

protection, and thermal shutdown. Both devices are

available in a space-saving, high-power (2.7W), 16-pin

TQFN package and are rated for operation over the

-40°C to +125°C temperature range.

Applications

FireWire

Power Supplies Automotive

Distributed Power Industrial

Features

♦ 4.5V to 40V (MAX5080) or 7.5V to 40V (MAX5081)

Input Voltage Range

♦ 1A Output Current

♦ V

OUT

Range From 1.23V to 32V

♦ Internal High-Side Switch

♦ Fixed 250kHz Internal Oscillator

♦ Automatic Switchover to Pulse-Skip Mode at

Light Loads

♦ External Frequency Synchronization

♦ Thermal Shutdown and Short-Circuit Protection

♦ Operates Over the -40°C to +125°C Temperature

Range

♦ Space-Saving (5mm x 5mm) High-Power 16-Pin

TQFN Package

MAX5080/MAX5081

1A, 40V, MAXPower Step-Down

DC-DC Converters

________________________________________________________________ Maxim Integrated Products 1

19-3656; Rev 0; 5/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX5080ATE -40°C to +125°C 16 TQFN-EP*

MAX5081ATE -40°C to +125°C 16 TQFN-EP*

MAX5080

4.5V TO 40V

ON/OFF

PGND

REG

SYNC SGND PGND SS COMP

DVREG

C-

OUT

PGND

BST

C+

BST

Typical Operating Circuits

FireWire is a registered trademark of Apple Computer, Inc.

Typical Operating Circuits continued at end of data sheet.

*EP = Exposed pad.

Pin Configurations appear at end of data sheet.

1 2 3 4 5 6 ... 18 19

Resumo do Conteúdo

Página 1 - DC-DC Converters

General DescriptionThe MAX5080/MAX5081 are 250kHz PWM step-downDC-DC converters with an on-chip, 0.3Ω high-sideswitch. The input voltage range is 4.5V

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters10 ______________________________________________________________________________________Sof

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters______________________________________________________________________________________ 11For

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters12 ______________________________________________________________________________________whe

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters______________________________________________________________________________________ 13equ

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters14 ______________________________________________________________________________________Pic

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters______________________________________________________________________________________ 15Sin

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters16 ______________________________________________________________________________________Fig

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters______________________________________________________________________________________ 17Pin

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters18 ______________________________________________________________________________________QFN

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC ConvertersMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely em

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters2 _______________________________________________________________________________________ABS

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters_______________________________________________________________________________________ 3ELE

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters4 _______________________________________________________________________________________ELE

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OPERATING FREQUENCY vs. TEMPERATUREMAX5080 toc07TEMPERATURE (°C)OPERATING FREQUENCY (kHz)1108535 6010-15242244246248250252254256258260240-40 135VIN =

Página 16

Typical Operating Characteristics (continued) (VIN= 12V, see Figure 5 (MAX5080) and Figure 6 (MAX5081), TA= +25°C, unless otherwise noted.)MAX5080/MAX

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters_______________________________________________________________________________________ 7Typ

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters8 _______________________________________________________________________________________Det

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MAX5080/MAX50811A, 40V, MAXPower Step-DownDC-DC Converters_______________________________________________________________________________________ 9Int

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Rainbow-electronics MAX5081 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX5081. Rainbow Electronics MAX5081 User Manual Manual do Utilizador

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