MAX5954LETX+T Maxim Integrated Products, MAX5954LETX+T Datasheet - Page 15

• Manufacturer Part Number: MAX5954LETX+T
• Description: IC PCI EXP/HOT-PLUG CTRLR 36TQFN
• Manufacturer: Maxim Integrated Products
• Type: Hot-Swap Controllerr

Specifications of MAX5954LETX+T

• Applications: General Purpose, PCI Express
• Internal Switch(s): No
• Voltage - Supply: 3.3V, 12V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-WFQFN Exposed Pad
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Single PCI Express, Hot-Plug
Controller
Table 1. Power Requirements for PCI Express Connectors
Table 2. Control Logic Truth Table
* PRES-DET high-to-low transition has a 5ms delay (t
(t
sets the duration of t
The MAX5954 monitors and actively limits the current of
the 12V and 3.3V outputs after the startup period. Each
output has its own overcurrent threshold. If any of the
monitored output currents rise above the overcurrent
threshold for a period t
controller disengages both the 12V and 3.3V outputs
(see the Fault Management section).
The auxiliary output current is internally monitored and
actively limited to the maximum current-limit value. An
overcurrent fault condition occurs when the
3.3V
Voltage Tolerance
Supply Current
Capacitive Load
12V
Voltage Tolerance
Supply Current
Capacitive Load
3.3V AUXILIARY
Voltage Tolerance
S up p l y C ur r ent, W ake E nab l ed
Supply Current, Non-Wake Enabled
Capacitive Load
FAULT
12V and 3.3V Outputs Normal Operation
3.3V Auxiliary Output Normal Operation
High
High
). R
Low
Low
ON
X
X
POWER RAIL
TIM
externally connected from TIM to GND
______________________________________________________________________________________
FAULT
FAULT
AUXON
.
High
High
Low
Low
X
X
, FAULT asserts and the
X1 CONNECTOR
1000µF (max)
375mA (max)
300µF (max)
150µF (max)
20mA (max)
±9% (max)
±8% (max)
±9% (max)
3.0A (max)
0.5A (max)
DEG
FON
High
High
High
High
High
Low
).
output current exceeds the overcurrent threshold
for longer than t
causes all supplies to be disabled after a programmable
time period t
Power-good (PWRGD) is an open-drain output that
pulls low a time (t
fully on. All outputs are considered fully on when 3.3G
has risen to V
V
adjustable from 2.5ms to 1.5s by connecting a resistor
from PORADJ to GND. See the Setting the Power-On-
Reset Timeout Period (t
3.3AUXO
PRES-DET
Low*
Low*
Low*
Low*
High
X4/8 CONNECTOR
X
1000µF (max)
1000µF (max)
375mA (max)
150µF (max)
20mA (max)
±9% (max)
±8% (max)
±9% (max)
3.0A (max)
2.1A (max)
is less than V
FAULT
PGTH3.3
FAULT
(see the Fault Management section).
POR_HL
12V AND 3.3V
OUTPUTS
, 12G has risen to V
. A fault on an auxiliary channel
POR
On
Off
Off
On
Off
On
) after all of the outputs are
) section.
Power-Good (
PGTH3.3AUX
X16 CONNECTOR
1000µF (max)
2000µF (max)
375mA (max)
150µF (max)
20mA (max)
±9% (max)
3.0A (max)
±8% (max)
5.5A (max)
±9% (max)
AUXILIARY
3.3VAUXO
. t
OUTPUT
PGTH12
POR_HL
On
Off
Off
Off
On
On
P P W W R R G G D D )
, and
15
is