MAX5079EVKIT【PDF 1/18 页】EVAL KIT FOR MAX5079

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Sheet目录1228

[1页]2页 3页 4页 5页

19-3584; Rev 1; 3/09

ORing MOSFET Controller with

Ultra-Fast 200ns Turn-Off

General Description

The MAX5079 ORing MOSFET controller replaces

ORing diodes in high-reliability redundant, parallel-con-

nected power supplies. Despite their low forward-volt-

age drop, ORing Schottky diodes cause excessive

power dissipation at high currents. The MAX5079

allows for the use of low-on-resistance n-channel power

MOSFETs to replace the Schottky diodes. This results

in low power dissipation, smaller size, and elimination

of heatsinks in high-power applications.

The MAX5079 operates from 2.75V to 13.2V and includes

a charge pump to drive the high-side n-channel MOSFET.

Operation down to 1V is possible if an auxiliary voltage of

at least 2.75V is available. When the controller detects a

positive voltage difference between IN and BUS, the

n-channel MOSFET is turned on. The MOSFET is turned

off as soon as the MAX5079 sees a negative potential at

IN with respect to the BUS voltage, and is automatically

turned back on when the positive potential is restored.

Under fault conditions, the ORing MOSFET’s gate is

Features

o 2.75V to 13.2V Input ORing Voltage

o 1V to 13.2V Input ORing Voltage with 2.75V Aux

Voltage Present

o 2A MOSFET Gate Pulldown Current During Fault

Condition

o Ultra-Fast 200ns, MOSFET Turn-Off During Fault

Condition

o Supply Undervoltage and Bus Overvoltage

Detection

o Power-Good (PGOOD) and Overvoltage (OVP)

Outputs for Fault Detection

o Space-Saving 14-Pin TSSOP Package

o -40°C to +85°C Operating Temperature Range

Ordering Information

pulled down with a 1A current, providing an ultra-fast

200ns turn-off. The reverse voltage turn-off threshold is

externally adjustable to avoid unintentional turn-off of the

PART

MAX5079EUD

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

14 TSSOP

ORing MOSFET due to glitches at IN or BUS caused by

hot plugging the power supply.

Typical Operating Circuit

Additional features include an OVP flag to facilitate

shutdown of a failed power supply due to an overvolt-

age condition, and a PGOOD signal that indicates if V IN

is either below the undervoltage lockout or V BUS is in

an overvoltage condition. The MAX5079 operates over

the -40°C to +85°C temperature range and is available

V OUT1

POWER SUPPLY 1

(PS1)

1V TO 13.2V

>2.75V

V IN

AUXIN

SUB 75N 03-04

GATE

BUS

PGOOD

V BUS

BUS

COMMON

in a space-saving 14-pin TSSOP package.

UVLO

MAX5079

OVI

Applications

R STH

C STH

STH

C+

C-

FTH

OVP

GND

Paralleled DC-DC Converter Modules

N+1 Redundant Power Systems

Servers

C EXT

R FTH

Base-Station Line Cards

RAID

Networking Line Cards

V OUT2

POWER SUPPLY 2

(PS2)

1V TO 13.2V

V IN

SUB 75N 03-04

GATE

BUS

V BUS

C BUS

>2.75V

AUXIN

UVLO

STH

MAX5079

PGOOD

OVI

OVP

R STH

C STH

C+

C-

FTH

GND

Pin Configuration appears at end of data sheet.

C EXT

R FTH

________________________________________________________________ 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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