max5079eudt Maxim Integrated Products, Inc., max5079eudt Datasheet
max5079eudt
Manufacturer Part Number
max5079eudt
Description
Max5079 Oring Mosfet Controller With Ultra-fast 200ns Turn-off
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX5079EUDT.pdf
(18 pages)
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
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
ORing MOSFET due to glitches at IN or BUS caused by
hot plugging the power supply.
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
is either below the undervoltage lockout or V
an overvoltage condition. The MAX5079 operates over
the -40°C to +85°C temperature range and is available
in a space-saving 14-pin TSSOP package.
19-3584; Rev 0; 2/05
Pin Configuration appears at end of data sheet.
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.
Paralleled DC-DC Converter Modules
N+1 Redundant Power Systems
Servers
Base-Station Line Cards
RAID
Networking Line Cards
________________________________________________________________ Maxim Integrated Products
General Description
Applications
ORing MOSFET Controller with
BUS
is in
IN
Ultra-Fast 200ns Turn-Off
♦ 2.75V to 13.2V Input ORing Voltage
♦ 1V to 13.2V Input ORing Voltage with 2.75V Aux
♦ 2A MOSFET Gate Pulldown Current During Fault
♦ Ultra-Fast 200ns, MOSFET Turn-Off During Fault
♦ Supply Undervoltage and Bus Overvoltage
♦ Power-Good (PGOOD) and Overvoltage (OVP)
♦ Space-Saving 14-Pin TSSOP Package
♦ -40°C to +85°C Operating Temperature Range
Voltage Present
Condition
Condition
Detection
Outputs for Fault Detection
POWER SUPPLY 1
POWER SUPPLY 2
MAX5079EUD
(PS1)
(PS2)
PART
V
V
OUT2
OUT1
R
R
Typical Operating Circuit
1V TO 13.2V
STH
1V TO 13.2V
STH
C
C
STH
STH
>2.75V
>2.75V
Ordering Information
-40°C to +85°C
TEMP RANGE
V
V
IN
IN
AUXIN
UVLO
STH
AUXIN
UVLO
STH
C+
IN
C+
IN
C
C
EXT
EXT
SUB 75N 03-04
SUB 75N 03-04
C-
C-
MAX5079
MAX5079
GATE
GATE
FTH
FTH
U1
U2
R
R
FTH
FTH
N2
N1
GND
GND
PGOOD
PGOOD
BUS
BUS
OVP
OVP
OVI
OVI
14 TSSOP
PIN-PACKAGE
Features
V
V
BUS
BUS
COMMON
C
BUS
BUS
1
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