MIC2593-2YTQ TR Micrel Inc, MIC2593-2YTQ TR Datasheet - Page 24

• Manufacturer Part Number: MIC2593-2YTQ TR
• Description: IC PCI HOT PLUG CTLR DUAL 48TQFP
• Manufacturer: Micrel Inc
• Type: Hot-Swap Controllerr

Specifications of MIC2593-2YTQ TR

• Applications: PCI, PCI-X
• Internal Switch(s): No
• Voltage - Supply: 3.3V, 5V, ±12V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MIC2593-2YTQTR; MIC2593-2YTQTR

MOSFET and Sense Resistor Selection Guide
Listed in Table 5 below, by Manufacturer and Type
Number, are some of the more popular MOSFET and
resistor types used in PCI hot plug applications.
Although far from comprehensive, this information will
constitute a good starting point for most designs.
Power Supply Decoupling
In general, prudent system design requires that power
supplies used for logic functions should have less than
100mV of noise at frequencies of 100kHz and above. In
particular, the –12V supply should have less than 100mV
of peak-to-peak noise at frequencies of 1MHz or higher.
This is because the –12V supply is the most negative
potential applied to the IC, and is therefore connected to
the device's substrate. All of the subcircuits integrated
onto the silicon chip are hence subjected by capacitive
coupling to any HF noise on the –12V supply. While
individual capacitances are quite low, the amount of
injected energy required to cause a "glitch" can also be
quite low at the internal nodes of high speed logic circuits.
Less obviously, but equally important, is the fact that the
internal charge pump for the 3.3V
somewhat susceptible to noise on the +12V input when
that input is at or near zero volts. The +12V supply should
not carry HF noise in excess of 200mV peak-to-peak with
respect to chip ground when it is in the "off" state.
If either the –12V input, the +12V input, of both supplies
do carry significant HF noise (as can happen when they
are locally derived by a switching converter), the solution
Micrel, Inc.
September 2008
Fairchild Semiconductor
International Rectifier
MOSFET Vendors
Resistor Vendors
Vishay (Siliconix)
Vishay (Dale)
IRC
AUX
Si4420DY (second source to Vishay)
supplies is
FDS6670A (SO-8 package part)
Si4430DY (“LittleFoot
Si4420DY (“LittleFoot
IRF7413A (SO-8 package part)
FDS6644 (SO-8 package part)
FDS6688 (SO-8 package part)
(second source to WSL)
Key MOSFET Type(s)
Sense Resistors
WSL 3637 Series
OARS Series
WSL Series
LR Series
24
is both small and inexpensive. An LC filter made of a
ferrite bead between the noisy power supply input and the
MIC2593, followed by a "composite capacitor" from the
affected MIC2593 input pin to ground, will suffice for
almost any situation. A good composite capacitor for this
purpose is the parallel combination of a 47µF tantalum
bulk decoupling capacitor, and one 1µF and one 0.01µF
ceramic capacitor for high-frequency bypass. A suggested
ferrite bead for such use is Fair-Rite Products Corporation
part number 2743019447 (this is a surface-mountable
part). Similar parts from other vendors or a 0.27µH air-
core coil can also be used.
Noisy V
It is theoretically possible that high-amplitude, HF noise
reflected back into one or both of the MIC2593’s –12V
outputs could interfere with proper device operation,
although such noisy loads are unlikely to occur in the real
world. If this becomes an application-specific concern, a
pair of filters similar to that in Figure 14 will provide the
required HF bypassing. The capacitors would be
connected to the MIC2593’s –12V output pins, and the
ferrite beads would be placed between the –12V output
pins and the loads.
®
®
” Series)
” Series)
IN
Fair-Rite Products
Type 2743019447
SMT Ferrite Bead
Figure 14. Filter Circuit for Noisy Supplies
(+3.3V and/or –12V)
www.vishay.com/docs/wsl_30100.pdf
irctt.com/pdf_files/OARS.pdf
47µF
Tanalum
irctt.com/pdf_files/LRC.pdf
www.fairchildsemi.com
www.siliconix.com
Web Address
Web Address
www.irf.com
1µF
Ceramic
M9999-092208
10nF
Ceramic
To MIC2593
MIC2593