MAX5960AECS+T【PDF 16/25 页】IC CTRLR HOT-PLUG QD 80-TQFP

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Sheet目录43

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Quad PCI Express, Hot-Plug Controllers

16 ______________________________________________________________________________________

At power-up, the MAX5959/MAX5960 keep all the

external MOSFETs off until all supplies rise above their

respective UVLO thresholds. These devices keep the

internal MOSFETs off only until the 3.3VAUXIN supply

rises above its UVLO threshold. Upon a turn-on com-

mand, the MAX5959/MAX5960 enhance the external

and internal MOSFETs slowly with a constant gate cur-

rent to limit the power-supply inrush current. The

MAX5959/MAX5960 actively limit the current of all out-

puts at all times and shut down the corresponding

channel if an overcurrent condition persists for longer

than a resistor-programmable overcurrent timeout (see

the Fault Management section). Thermal protection cir-

cuitry also shuts down all outputs if the die temperature

exceeds +150癈. After an overcurrent or overtempera-

ture fault condition, the MAX5959/MAX5960 latch off or

automatically restart depending on the version, after a

restart time delay.

The power requirement for PCIe connectors is defined

by the PCIe card specification and summarized in

Table 1.

Startup

The main supply outputs can become active only after

all the following events have occurred:

" V

3.3AUXIN

is above its UVLO threshold.

" V

12VIN

and V

3.3SA+

are both above their UVLO

threshold.

" ON_ is driven high.

" PRES-DET_ is low for more than 4ms.

The auxiliary supply output is made available only after

the following events have occurred:

" V

3.3AUXIN

is above its UVLO threshold.

" AUXON_ is driven high.

" PRES-DET_ is low for more than 4ms.

The FON_ input overrides all other control signals and

turns on the respective slot when driven low, as long as

the UVLO thresholds have been reached. Table 2 sum-

marizes the logic conditions required for startup. The aux-

iliary supply input powers the internal control logic and

analog references of the MAX5959/MAX5960, so the main

supplies cannot be enabled, if V

3.3VAUXIN

is not present.

When an output is enabled, a programmable startup

timer (t

) begins to count the startup time duration.

The value of t

is set to 2x the fault timeout period

FAULT

). R

TIM

externally connected from TIM to GND

sets the duration of t

FAULT

Table 1. Power Requirement for PCIe Connectors

POWER FAIL

X1 CONNECTOR

X4/8 CONNECTOR

X16 CONNECTOR

3.3V

Voltage Tolerance

?% (max)

Supply Current

3.0A (max)

Capacitive Load

1000礔 (max)

12V

Voltage Tolerance

?% (max)

Supply Current

0.5A (max)

2.1A (max)

5.5A (max)

Capacitive Load

300礔 (max)

1000礔 (max)

2000礔 (max)

3.3V AUXILIARY

Voltage Tolerance

?% (max)

Supply Current, Wake Enabled

375mA (max)

Supply Current, Nonwake Enabled

20mA (max)

Capacitive Load

150礔 (max)

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