Datasheet

TPS2363
www.ti.com SLUS680B –JANUARY 2006–REVISED JANUARY 2010
DEVICE INFORMATION
TERMINAL FUNCTIONS
TERMINAL
NAME I/O DESCRIPTION
NO.
TPS2363 MIC2592B
Active low, fault output for the slot (filtered). FAULTA/B indicates an
over-current, undervoltage, or over temperature event occurred on either
FAULTA/B /FAULTA/B 1/36 O the AUX or the main supplies. AUXENA/B must be disabled to reset an
AUX fault. ONA/B must be disabled to reset a main fault. This open drain
output must be pulled up to AUXINA/B with a 100-kΩ resistor.
An external capacitor to ground sets the time allowed for the fault event
FILTERA/B FILTERA/B 2/35 I (MAIN or AUX) to continue before turning off the SlotA/B main power. The
Fault Timer section discusses capacitor selection.
Gate drive pin for the 12-V P-channel FET. A capacitor on this pin to the
G12A/B 12VGATEA/B 3/34 O OUT12A/B pin sets the slew rate in order to limit the inrush current. See
the inrush section that discusses gate capacitor selection.
General purpose input, filtered for direct connection to a mechanical
switch. The condition of this input is read through the common status
GPIA/B1 GPI_A0/B0 4/38 I register of the SMBus. If not used connect this pin to ground. These pins
can be used for switch (module inserted) or attention button. These inputs
have an internal 100 kΩ pull down.
12-V supply input and high side of the sense resistor. These pins and the
associated sense resistors require some attention to layout. See the layout
SH12A/B 12VINA/B 5/32 I
considerations section for sense resistor layout. This pin requires 0.1-mF
bypass capacitor to ground
Active low output indicates power is good on all voltages for this slot. This
PGOODA/B /PWRGDA/B 6/31 O
open drain output must be pulled up to AUXINA/B with a 100-kΩ resistor.
General purpose input, filtered for direct connection to a mechanical
switch, the condition of this input is read through the common status
GPIA/B2 NC 7/30 I register of the SMBus. These pins can be used for switch (module
inserted) or attention button. These GPIs are available only on the
TPS2363, if not used, leave as no connection.
Low side of the sense resistor for 12-V supply. When the voltage across
the sense resistor exceeds the current limit threshold, the slot is in an over
SL12A/B 12VSENSEA/B 8/29 I
current condition. Use a Kelvin connection for the sense resistor wiring.
See the layout considerations section.
Active low, forces the channel on even when there is a fault for
diagnostics. This can be disabled by the SMBus FORCEON INHIB bits.
FORCEONA/B /FORCE_ONA/B 9/28 I
Thermal shutdown overrides the FORCEONA/B. The SMBus STATA/B
registers contains the state of SlotA/B.
12-V channel output pin is used to monitor the SlotA/B voltage for power
good. When the main power is turned off, there is a 1.2-kΩ bleed-down
OUT12A/B 12VOUTA/B 10/27 I/O
circuit, when all the voltages are below 100 mV slot power off can be read
from the SMBus.
3.3-V auxiliary power for PCIExpress applications, SMBus and internal
AUXINA/B VSTBYA/B 11/26 I logic. If there is no AUX supply AUXINA/B must be tied to the 3.3-V
supply. This pin requires 0.1-mF bypass capacitor to ground.
3.3V supply input and high side of the sense resistor, these pins and the
associated sense resistors require some attention to layout. See layout
SH33A/B 3VINA/B 12/25 I
considerations section for sense resistor layout. This pin requires 0.1-mF
bypass capacitor to ground.
Low side of the sense resistor for 3.3-V supply. When the voltage across
the sense resistor exceeds the current limit threshold, the slot is in an over
SL33A/B 3VSENSEA/B 13/24 I
current condition. Use a Kelvin connection for the sense resistor wiring.
See the layout considerations section.
Gate drive pin for the 3.3-V N-channel FET. A capacitor on this pin to
G33A/B 3VGATEA/B 14/23 O ground sets the slew rate in order to limit the inrush current. The Inrush
Section discusses capacitor selection.
VAUXA/B VAUXA/B 15/22 O VAUX output to SlotA/B.
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