MAX5959AECS+ Maxim Integrated Products, MAX5959AECS+ Datasheet - Page 22

• Manufacturer Part Number: MAX5959AECS+
• Description: IC CTRLR HOT-PLUG QD 80-TQFP
• Manufacturer: Maxim Integrated Products
• Type: Hot-Swap Controllerr

Specifications of MAX5959AECS+

• 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: 80-TQFP, 80-VQFP
• Product: Controllers & Switches
• Supply Voltage (max): 13 V
• Supply Voltage (min): 3.3 V
• Power Dissipation: 1860 mW
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Supply Current: 1 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

External capacitance can be added from the gate of
the external MOSFETs to GND to slow down the dV/dt
of the 12V and 3.3V outputs. The maximum gate
capacitance load at 12G_ and 3.3G_ must be consis-
tent with the conditions described in the Setting the
Power-On Reset section.
Large capacitive loads at the 12V output, the 3.3V out-
put, and the 3.3V auxiliary output can cause a problem
when inserting discharged PCI cards into live back-
planes. A fault occurs if the time needed to charge the
capacitance of the board is greater than the typical
startup time (2 x t
stand large capacitive loads due to their adjustable
startup times and adjustable current-limit thresholds.
Calculate the maximum load capacitance as follows:
V
3.3V auxiliary output for slot A, slot B, slot C, or slot D.
Quad PCI Express, Hot-Plug Controllers
Table 3. Component Manufacturers
22
Sense Resistor
MOSFETs
OUT
______________________________________________________________________________________
is either the 3.3V output, the 12V output, or the
Additional External Gate Capacitance
COMPONENT
C
LOAD
FAULT
Maximum Load Capacitance
< (t
). The MAX5959/MAX5960 with-
SU
x I
Vishay-Date
IRC
Fairchild
International Rectifier
Motorola
Vishay-Siliconix
LIM
) / V
MANUFACTURER
OUT
The 12V input (12VIN), the 3.3V input (3.3SA+), and the
3.3V auxiliary (3.3AUXIN) must be above their UVLO
thresholds before startup can occur. Input transients
can cause the input voltage to sag below the UVLO
threshold. The MAX5959/MAX5960 reject transients on
the input supplies that are shorter than 4µs (typ).
Because some load fault conditions can cause voltage
transients to propagate to the supply inputs with dura-
tion of greater than 4µs, it is recommended that a small
Schottky diode be placed in series with the 12VIN pin
connection, upstream of the 1µF bypass capacitor. This
provides a hold-up supply that will prevent the 12VIN
input from dropping below V
sients. See the Typical Application Circuit .
402-564-3131
704-264-8861
888-522-5372
310-322-3331
602-244-3576
PHONE
—
12UVLO
www.mot-sps.com/ppd
www.fairchildsemi.com
Input Transients
www.vishay.com
www.vishay.com
www.irctt.com
www.irf.com
during severe tran-
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