Datasheet
MAX5946
Dual PCI Express, Hot-Plug
Controller
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
(All voltages referenced to GND, unless otherwise noted.)
12VIN......................................................................-0.3V to +14V
12GA, 12GB ..............................................-0.3V to (V
12VIN
+ 6V)
12SA+, 12SA-, 12SB+, 12SB-,
3.3GA, 3.3GB .....................................-0.3V to (V
12VIN
+ 0.3V)
3.3VAUXIN, ONA, ONB,
FAULTA, FAULTB ............-0.3V to +6V
PWRGDA, PWRGDB ................................................-0.3V to +6V
PGND ....................................................................-0.3V to +0.3V
All Other Pins to GND......................-0.3V to (V
3.3VAUXIN
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
36-Pin Thin QFN (derate 26.3mW/°C above +70°C).....2.105W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V
12VIN
= V
12S_-
= V
12S_+
= 12V, V
3.3S_+
= V
3.3S_-
= V
3.3VAUXIN
= V
ON_
= V
AUXON_
= V
FON__
= 3.3V, PWRGD_ = FAULT_ = PORADJ
= TIM = OUTPUT_ = 12G_ = 3.3G_ = OPEN, INPUT_ = PRES_DET_ = PGND = GND, T
A
= -40°C to +85°C, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
12V SUPPLY
12V Supply Voltage Range V
12VIN
10.8 12 13.2
V
V
12VIN
rising
9.5 10 10.5
12VIN Undervoltage Lockout
V
12UVLO
Hysteresis
0.1
V
12VIN Supply Current I
12VIN
V
12VIN
= 13.2V
0.5
1mA
12VIN CONTROL
12VIN Current-Limit
Threshold (V
12S_+
- V
12S_-
)
V
12ILIM
49 54 59
mV
12G_ Gate Charge Current
I
12G_CHG
V
12G_
= GND 4 5 6 µA
Normal turn-off, ON_ = GND, V
12G
_ = 2V
50 150 250
µA
12G_ Gate Discharge Current
I
12G_DIS
O utp ut shor t- ci r cui t cond i ti on, str ong g ate p ul l d ow n
to r eg ul ati on, V
1 2V IN
- V
1 2S _
≥ 1V , V
1 2G_
= 5V
50 120 180
mA
12G_ Gate High Voltage
(V
12G_
- V
12VIN
)
V
12G_H
I
12G_
= 1µA
4.8 5.3 5.8
V
12G_ Threshold Voltage For
PWRGD_ Assertion (Note 2)
V
PGTH12
Referred to V
12VIN
, I
12G_
= 1µA
-3.0
-4
-4.8
V
12S_- Input Bias Current 1µA
12S_+ Input Bias Current
20 60
µA
3.3V SUPPLY
3.3V Supply Voltage Range
V
3.3SA+
,
V
3.3SB+
3.0 3.3 3.6
V
3.3SA+ rising
2.52 2.65 2.78
V
Undervoltage Lockout
(Note 3)
Hysteresis
30
mV