TPS2341 Datasheet, PDF (1/33 Pages) Texas Instruments – DUAL-SLOT PCI HOT-PLUG POWER CONTROLLER WITH I2C INTERFACE

TPS2341
SLUS513A − MAY 2003 − REVISED JULY 2004
DUALĆSLOT PCI HOTĆPLUG
POWER CONTROLLER WITH I²C INTERFACE
FEATURES
D 12-V, −12-V, 3.3-V, 5-V Main Power Switching
and Auxiliary 3.3-V Power Switching
D 12-V, −12-V And Auxiliary 3.3-V Power FETs
D Hot-Swap Protection and Control of All
Supplies
D Overcurrent Protection for All Supplies
D Isolation of Any Load Fault in One Slot from
Any Other Slot
D Undervoltage Monitoring for the Main 12-V,
3.3-V, 5-V and Auxiliary 3.3-V Supplies
D Power Fault Latching
D Overtemperature Shutdown
D I²C Interface for Power Control, Power
Status, Slot Control And Slot Status
D Compliant To PCI And PCI-X Hot Plug
Specifications
D One TPS2341 Supports Two Slots
DESCRIPTION
The TPS2341 contains main supply power
control, auxiliary supply power control, power
FETs for 12-V, −12-V and auxiliary 3.3-V supplies,
and a serial interface for communications with and
control of slots. Each TPS2341 contains supply
control and switching for two slots.
The main power control circuits start with all
supplies off and hold all supplies off until power to
the TPS2341 is valid on all positive supplies.
When power is requested, the control circuit
applies constant current to the gates of the power
FETs, allowing each FET to ramp the load voltage
linearly. Each main supply can be programmed for
a desired ramp rate by selecting a gate capacitor
for the power FET for that supply. The power
control circuits also monitor load current and latch
off that slot if the load current exceeds a
programmed maximum value. In addition, once
the 12-V, the 5-V, and the 3.3-V FET are fully
enhanced, the load voltage is monitored. If the
load voltage drops out of specification limit after
these FETs are fully enhanced, the slot latches off.
This feature provides another level of protection
from load fault.
The auxiliary power control circuit provides power
to the 3VAUXx pins through the 3.3-V main supply
when it is above 3.0 V, and through the 3.3-V
standby input supply when the 3.3-V main supply
drops below 3.0 V.
The TPS2341 contains power FETs for 12 V at
500 mA, −12 V at 100 mA, and auxiliary 3.3 V at
375 mA for each slot. These power FETs are
short-circuit protected, slew rate controlled, and
over-temperature protected.
The serial interface communicates with a slot
controller using the I²C serial protocol. The
interface communicates with the slot, and
mechanical switches with individual, dedicated
lines. The interface operates from the 3.3-V
auxiliary power, but inputs are 5-V tolerant.
Mechanical switch inputs have internal pull-up
and hysteresis. The serial interface controls slot
power, and monitors board, power fault, and
switch input status.
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.
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Copyright  2003, Texas Instruments Incorporated
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