MAX4273EVKIT【PDF 1/26 页】EVAL KIT FOR MAX4273

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Sheet目录1228

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ATION

ILABLE

19-1694; Rev 2; 12/07

KIT

EVALU

AVA

3V to 12V Current-Limiting Hot-Swap Controllers

with Autoretry, DualSpeed/BiLevel Fault Protection

General Description

The MAX4271/MAX4272/MAX4273 comprise a com-

plete family of integrated 3V to 12V hot-swap con-

trollers. They allow the safe insertion and removal of

circuit cards into live backplanes.

The discharged filter capacitors of the circuit card pro-

vide a low impedance to the live backplane. High in-

rush currents from the backplane to the circuit card can

burn up connectors and components, or momentarily

collapse the backplane power supply leading to a sys-

tem reset. This family of hot-swap controllers prevents

such problems by regulating the current to a preset

limit when the board is plugged in, allowing the system

to stabilize safely. After the startup cycle is completed,

two on-chip comparators provide DualSpeed/BiLevel?

protection against short circuits, load glitches, and

overcurrent conditions. In the event of a fault condition,

the load is disconnected. Fault recovery is handled by

unlatching (MAX4271), autoretry (MAX4272), or pro-

grammed (MAX4273) methods.

The MAX4271 family includes many integrated features

Features

? Provide Safe Hot Swap for +3V to +12V Power

Supplies with Few External Components

? Unique Current Regulation Architecture

Minimizes n-FET Linear Mode Duration

? Autoretry Feature (MAX4272/MAX4273)

? DualSpeed/BiLevel Current Limit Protects Against

Current Glitches and Short Circuits

? Power-On RESET (MAX4273)

? 15V Absolute Maximum Rating Protects Against

Inductive Kickbacks During Board Removal

? Internal Charge Pump Generates Gate Drive for

External n-MOSFET

? Status Output Pin Indicates Fault/Safe Condition

? Space-Saving 8-Pin SO, 16-Pin QSOP Packages

________________________Applications

that reduce component count and design time. An on-

board charge pump provides the gate drive for a low-

cost, external n-FET. Integrated features like startup

current regulation and current glitch protection eliminate

external timing resistors and capacitors. Also featured

Base Stations

RAID

Remote-Access Servers

Network Routers and

Switches

ISDN

are an open-drain status output to indicate a fault condi-

tion, and an adjustable overcurrent response time.

Ordering Information

The MAX4271 (latched fault protection) and MAX4272

(autoretry fault protection) come in 8-pin SO packages.

The MAX4273 (full function) comes in the space-saving

16-pin QSOP package and 16-pin SO package. All

parts are specified across the extended temperature

range, and have an absolute maximum rating of 15V to

provide extra protection against inductive kickback dur-

ing board removal.

PART

MAX4271 ESA

MAX4272 ESA

MAX4273 EEE

MAX4273ESE

TEMP RANGE

-40 ° C to +85 ° C

PIN-

PACKAGE

8 SO

16 QSOP

16 SO

PKG

CODE

S8-1

E16-1

DualSpeed/BiLevel is a trademark of Maxim Integrated

Pin Configurations appear at end of data sheet.

Products.

Typical Operating Circuit

BACKPLANE

REMOVABLE CARD

V CC

2.7V TO 13.2V

R SENSE

V OUT

C BOARD

SENSE

GATE

STAT

GND

STAT

MAX4271

CSPD

MAX4272

GND

CTIM

C TIM

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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