MAX5079EUD+ Maxim Integrated Products, MAX5079EUD+ Datasheet - Page 14

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

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

latches low and the internal GATE pulldown circuitry is
activated and pulls GATE low only when both of the
conditions are satisfied:
1) V
2) V
OVP can sink 10mA maximum. Cycle power or pull
UVLO low and then high again to reset the OVP latch.
GATE is pulled to PGND and remains low as long as
V
low. However, the MAX5079 tries to turn on the ORing
MOSFET unless V
age lockout. Use OVP to drive the cathode of an opto-
coupler to shut down the respective power supply from
the primary side (see the Typical Application Circuit of
Figure
PGOOD output pulls low when V
or V
of 2mA.
ORing MOSFET Controller with
Ultra-Fast 200ns Turn-Off
14
OVI
OVI
OVI
IN
______________________________________________________________________________________
≥ 0.6V. When V
≥ V
2) or fire an SCR connected from IN to PGND.
≥ 0.6V.
goes above 0.6V. PGOOD can sink a maximum
BUS
Power-Good Comparator (PGOOD)
.
IN
is actively kept below the undervolt-
OVI
drops below 0.6V, OVP remains
UVLO
falls below 0.6V
1) Place a 1µF ceramic input bypass capacitor physi-
2) Sense the V
3) Place the charge-pump capacitor (C
4) Run a thick trace from the gate of the ORing MOSFET
cally close to IN and PGND. Connect IN as close as
possible to the source of the ORing MOSFET.
the drain of the ORing MOSFET. When IN is shorted to
ground during a fault, BUS is also pulled low through
the ORing MOSFET. In the absence of V
MAX5079 loses both power inputs V
can cause a delayed pulldown of the gate. Sensing
the BUS away from the ORing MOSFET drain, close to
the BUS bulk capacitor provides power to the
MAX5079 for a few microseconds, long enough to pull
down the ORing MOSFET gate and isolate BUS from a
shorted IN.
slow-comparator blanking time adjustment capacitor
(C
to GATE.
STH
) as close as possible to the MAX5079.
BUS
close to the bulk capacitor, away from
Layout Guidelines
IN
and V
EXT
AUXIN
) and the
BUS
. This
, the