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MAX5079

ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off

Maxim Integrated 

ORing MOSFET Controller with

Ultra-Fast 200ns Turn-Off

Pin Description

PIN

NAME

FUNCTION

1

CXN

Negative Terminal of External Flying Charge-Pump Capacitor

2

CXP

Positive Terminal of External Flying Charge-Pump Capacitor

3

OVP

Open-Drain Active-Low Output. OVP sinks up to 10mA when VOVI ≥ 0.6V and VIN ≥ VBUS. OVP can be

used to drive an optodiode. Cycle power or pull UVLO low and then high to reset OVP.

4

PGOOD Open-Drain Active-Low Output. PGOOD pulls low when VUVLO ≤ 0.6V or VOVI ≥ 0.6V.

ORing MOSFET Slow-Comparator Reverse Voltage Threshold and Blanking Time Setting Input. Connect

5

STH

a resistor from STH to GND to set the threshold. Connect a capacitor from STH to GND to set the

blanking time. Leave STH floating to set the internal threshold (-12mV) and internal blanking time

(0.9ms).

6

FTH

Fast-Comparator Reverse Threshold Setting. Connect a resistor from FTH to GND to set the fast-

comparator reverse voltage threshold from -24mV to -400mV.

7

OVI

Overvoltage Comparator Input. Connect OVI to BUS through a resistive divider.

8

UVLO

Undervoltage Lockout Comparator Input. Connect UVLO to IN through a resistive divider. The MAX5079

remains off until VUVLO rises above 0.66V. When VUVLO rises above 0.664V, VGATE is raised to VIN.

9

PGND

Power Ground. Ground discharge path of the 2A GATE pulldown. Connect to external power ground

plane.

10

GATE Gate-Driver Output for n-Channel ORing MOSFET

11

BUS

Bus Voltage-Sense Input. Connect BUS to the drain of the ORing MOSFET to sense the polarity of the

Bus Current. The MAX5079 receives its power from BUS when VIN and VAUXIN are not present.

12

GND

Signal Ground. Connect to the low-level signal or analog ground.

13

IN

Source Connection for ORing MOSFET and Supply Input for the MAX5079. Connect IN directly to the

power-supply voltage of 2.75V to 13.2V or 1V to 13.2V with VAUXIN ≥ 2.75V.

14

AUXIN

Auxiliary Power-Supply Input. AUXIN supplies power to the IC when 1V ≤ VIN ≤ 2.75V. Connect AUXIN to

2.75V or higher if VIN is less than 2.75V.

8 _______________________________________________________________________________________

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