TPS2342 Datasheet, PDF (1/53 Pages) Texas Instruments – DUAL SLOT PCI-X 2.0 HOT PLUG POWER CONTROLLER

TPS2342
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SLUS572E − OCTOBER, 2003 − REVISED FEBRUARY 2005
DUAL SLOT PCIĆX 2.0 HOT PLUG POWER CONTROLLER
FEATURES
D Supports PCI, PCI−X 1.0 and PCI−X 2.0
D Internal Power Switches for –12 V, 12 V, 3.3 V
Aux
D Control for External Power Switches for 5 V,
3.3 V, and V_Io
D Overload Protection on All Supplies
D Input Under-Voltage Protection for 3.3 V, 5 V,
12 V and V_AUX Supplies
D Soft Start to Minimize Inrush Current
D Programmable Slew Rate for 3.3 V, 5 V, 12 V,
V_IO and V_AUX Supplies
D Multi-Slot or Single-Slot Serial Operating
Mode
D Direct Operating Mode
D V_IO Selection Based on Card Type
D 80-Lead PowerPadt TQFP Package
APPLICATIONS
D Hot Plug Slots in Servers
SIMPLIFIED APPLICATION DIAGRAM
PCI-X 2.0 SLOT
VIO
DESCRIPTION
The TPS2342 contains main supply power
control, auxiliary supply power control, power
FETs for 12-V, −12-V and auxiliary 3.3-V supplies,
V_IO control, and digital control of slots. Each
TPS2342 contains supply control and switching
for two slots. The TPS2342 supports both serial
and direct communication to the slots.
The main power control circuits start with all
supplies off and all outputs are held off until all
power supplies to the TPS2342 are valid. When
power is requested via the serial interface or by
direct control, the control circuit applies constant
current to the gates of the power FETs, allowing
each FET to ramp load voltage linearly. Each
supply can be programmed for a desired ramp
rate by selecting the appropriate gate capacitor.
The power control circuits monitor load current
and latch off that slot if the load current exceeds
a programmed maximum value. Once the 12-V,
the 5-V, and the 3.3-V FETs are fully enhanced,
the load voltage is monitored. If the load voltage
drops out of specification after these FETs are fully
enhanced, the slot latches off.
PCI-X 2.0 SLOT
VIO
CONTROL
LOGIC
3.3VAUX 12V −12V CONTROL −12V 12V 3.3VAUX
1.5 V 3.3 V 5 V
5 V 3.3 V 1.5 V
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPadt is a trademark of Texas Instruments Incorporated.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright  2004, Texas Instruments Incorporated
www.ti.com
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