MAX5079EUD+ Maxim Integrated Products, MAX5079EUD+ Datasheet

IC CNTRL ORING MOSFET 14TSSOP

MAX5079EUD+

Manufacturer Part Number
MAX5079EUD+
Description
IC CNTRL ORING MOSFET 14TSSOP
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX5079EUD+

Applications
Base Station-Networking Line Cards, Servers
Fet Type
N-Channel
Number Of Outputs
1
Internal Switch(s)
No
Delay Time - On
10µs
Delay Time - Off
70ns
Voltage - Supply
2.75 V ~ 13.2 V
Current - Supply
4mA
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
14-TSSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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 1; 3/09
Pin Configuration appears at end of data sheet.
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.
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
o 2.75V to 13.2V Input ORing Voltage
o 1V to 13.2V Input ORing Voltage with 2.75V Aux
o 2A MOSFET Gate Pulldown Current During Fault
o Ultra-Fast 200ns, MOSFET Turn-Off During Fault
o Supply Undervoltage and Bus Overvoltage
o Power-Good (PGOOD) and Overvoltage (OVP)
o Space-Saving 14-Pin TSSOP Package
o -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
TEMP RANGE
-40°C to +85°C
V
V
IN
IN
AUXIN
UVLO
STH
AUXIN
UVLO
STH
C+
IN
C+
IN
C
C
EXT
EXT
SUB 75N 03-04
C-
C-
SUB 75N 03-04
MAX5079
MAX5079
GATE
GATE
FTH
FTH
U1
U2
R
R
FTH
FTH
N1
N2
GND
GND
PGOOD
PGOOD
BUS
BUS
OVP
OVP
OVI
OVI
PIN-PACKAGE
Features
14 TSSOP
V
V
BUS
BUS
COMMON
C
BUS
BUS
1

Related parts for MAX5079EUD+

MAX5079EUD+ Summary of contents

Page 1

... Servers Base-Station Line Cards RAID Networking Line Cards Pin Configuration appears at end of data sheet. ________________________________________________________________ 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. ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off o 2 ...

Page 2

ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off ABSOLUTE MAXIMUM RATINGS GATE to GND ..............................................-0. All Other Pins to GND.............................................-0.3V to +15V Continuous Current Into Any Pin ......................................±50mA Continuous Power Dissipation (T = +70°C) A 14-Pin TSSOP (derate 9.1mW/°C ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) ((V = 2.75V to 13.2V and AUXIN T = -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER SYMBOL ORing MOSFET CONTROL ORing MOSFET Turn-On Time ORing ...

Page 4

ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off ELECTRICAL CHARACTERISTICS (continued) ((V = 2.75V to 13.2V and AUXIN T = -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER V Switchover ...

Page 5

See the Typical Operating Circuit .) A SLOW-COMPARATOR BLANKING TIME t vs 180kΩ) STH STH STH 100 75mV OVERDRIVE 0.1 ...

Page 6

ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off (T = +25°C, unless otherwise noted. See the Typical Operating Circuit .) A FAULT CURRENT WAVEFORM (IN SHORTED TO PGND) 1µs/div V = 2.75V 2.75V, IN BUS V = 0V, C ...

Page 7

See the Typical Operating Circuit .) A FAULT CURRENT WAVEFORM (IN SHORTED TO PGND) MAX5079 toc14 1µs/div V = 12V 12V, IN BUS AUXIN STH R ...

Page 8

ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off PIN NAME 1 CXN Negative Terminal of External Flying Charge-Pump Capacitor 2 CXP Positive Terminal of External Flying Charge-Pump Capacitor Open-Drain Active-Low Output. OVP sinks up to 10mA when V 3 OVP used ...

Page 9

AUXIN TO GATE DIRECT CONNECTION BUS IN/AUXIN/BUS V SUPPLY SWITCHOVER AUXIN IN/AUXIN CHARGE-PUMP SWITCHOVER IN/AUXIN SUPPLY IN SWITCHOVER GATE TARGET SELECTOR GND PGOOD UVLO LOGIC OVI OV LOGIC OVP Figure 1. Block Diagram _______________________________________________________________________________________ ORing MOSFET Controller with Ultra-Fast 200ns ...

Page 10

ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off Detailed Description The MAX5079 ORing MOSFET controller drives an external n-channel MOSFET and replaces ORing diodes in high-reliability redundant power-management systems or multiple paralleled power supplies. The device has an internal charge pump ...

Page 11

During the hot insertion, a voltage spike can occur at N1 and N2 and cause the ( voltage to go negative. If the OUT2 BUS reverse voltage is below the fast-comparator reverse voltage threshold (V ...

Page 12

ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off 5) PS1, PS2, PS3 are present and PS1 goes open. PS1’s output capacitors discharge and V below V . The MAX5079 (U1) senses a negative BUS potential from Depending ...

Page 13

12V. For above V and for V > 8V, the gate drive is 7V above Lower gate drive means ...

Page 14

ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off latches low and the internal GATE pulldown circuitry is activated and pulls GATE low only when both of the conditions are satisfied: ≥ 0.6V OVI ≥ ...

Page 15

V OUT1 POWER SUPPLY 1 (PS1) TO PRIMARY-SIDE SHUTDOWN V OUT2 POWER SUPPLY 2 (PS2) TO PRIMARY-SIDE SHUTDOWN V OUT3 POWER SUPPLY 3 (PS3) TO PRIMARY-SIDE SHUTDOWN Figure 2. Typical Application Circuit ______________________________________________________________________________________ ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off ...

Page 16

ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off V OUT1 V BUS POWER SUPPLY 1 (PS1) TO PRIMARY-SIDE SHUTDOWN V OUT2 V BUS POWER SUPPLY 2 (PS2) TO PRIMARY-SIDE SHUTDOWN Figure 3. Parallel Supplies with Back-to-Back MOSFET 16 ______________________________________________________________________________________ 1V TO ...

Page 17

Pin Configuration TOP VIEW CXN 1 14 CXP 2 13 OVP 3 12 MAX5079 PGOOD 4 11 STH 5 10 FTH 6 9 OVI 7 8 TSSOP ______________________________________________________________________________________ ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off TRANSISTOR COUNT: 2,911 PROCESS: BiCMOS ...

Page 18

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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