參數(shù)資料
型號(hào)： MIC2590B-5BTQ TR
廠商： Micrel Inc
文件頁(yè)數(shù)： 12/23頁(yè)
文件大?。?/td> 230K
描述： IC PCI HOT PLUG CTLR DUAL 48TQFP
標(biāo)準(zhǔn)包裝： 2,000
類型： 熱交換控制器
應(yīng)用： PCI，PCI-X
內(nèi)部開關(guān)： 無(wú)
電源電壓： 3.3V，5V，±12V
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 48-TQFP
供應(yīng)商設(shè)備封裝： 48-TQFP（7x7）
包裝： 帶卷 (TR)
其它名稱： MIC2590B-5BTQTR
MIC2590B-5BTQTR-ND
Micrel, Inc.
MIC2590B
 
September 2008 
12
M9999-091808
 
equation   above   computes   the   minimum   value   to
guarantee the device does not enter into current limit. The
slew rate dv/dt is computed by:
 
6
SLEW
SLEW
10
C
I
load
 
at
 
dv/dt
?/DIV>
=
 
By appropriate selection of the value of C
SLEW
, it can be
ensured that the magnitude of the inrush current never
exceeds the current limit for a given load capacitance.
Since one capacitor fixes the slew rate for both +12V and
12V, the capacitor value should be chosen to provide the
slower slew rate of the two. Table 2 depicts the output
slew rate for various values of C
SLEW
.
I
SLEW
 = 25礎(chǔ)
C
GATE
 
dv/dt (load)
0.001礔
22000V/s
0.01礔
2200V/s
0.1礔
220V/s
1礔
22V/s
Table 2. ?2V Output Slew Rate Selection
Power Down Cycle
When a slot is turned off, internal switches are connected
to each of the outputs to discharge the PCI board's
bypass capacitors to ground.
Standby Mode
Standby mode is entered when any one (or more)
enabled MAIN supply input(s) (12V
IN
, 12MV
IN
, 5V
IN
 and
3V
IN
) drops below its respective UVLO threshold. The
MIC2590B supplies two 3.3V auxiliary outputs, V
AUX
[A/B],
satisfying PCI 2.2 specifications. These outputs are fed
via the V
STBY
  input, and controlled by the AUXEN[A/B]
inputs or via their SMI bus Control Registers. These
outputs are independent of the MAIN outputs: should one
or more of the MAIN supply inputs move below its UVLO
thresholds, V
AUX
[A/B] still function as long as V
STBY
  is
present. Prior to entering standby mode, ONA and ONB
(or the MAINA and MAINB bits in the Control Registers)
inputs should be de-asserted. If this is not done, the
MIC2590B will assert /FAULT, and also /INT if interrupts
are   enabled,   when   the   MIC2590B   detects   an
undervoltage condition on a supply input.
Circuit Breaker Functions
The MIC2590B provides an electronic circuit breaker
function that protects against excessive loads such as
short circuits at each supply. When the current from one
or more of a slots MAIN outputs exceeds the current limit
threshold (50mV/R
SENSE
 for 3.3V and 5V, 1.0A for +12V,
and/or 0.2Afor 12V) for a duration greater than t
FLT
, the
circuit breaker is tripped and all MAIN supplies (all outputs
except V
AUX
[A/B]) are shut off. Should the load current
exceed I
THFAST
  (+12V and 12V), or cause a MAIN
outputs V
SENSE
 to exceed V
THFAST
 (+3.3V and +5V), the
outputs   are   shut   off   with   no   delay.   Undervoltage
conditions on the MAIN supply inputs also trip the circuit
breaker, but only when the MAIN outputs are enabled (to
signal a supply input brown-out condition).
The V
AUX
[A/B] outputs have their own separate circuit
breaker functions. V
AUX
 [A/B] do not incorporate a fast-trip
threshold, but instead regulate the output current into a
fault to avoid exceeding their operating current limit. The
circuit breaker will trip due to overcurrents on V
AUX
 [A/B]
when the fault timer expires. This use of the t
FLT
  timer
prevents the circuit breaker from tripping prematurely due
to brief current transients.
Following a fault condition, the outputs can be turned on
again via the ON inputs (if the fault occurred on one of the
MAIN outputs), via the AUXEN inputs (if the fault occurred
on the AUX outputs), or by cycling both ON and AUXEN
(if faults occurred on both the MAIN and AUX outputs). A
fault condition can alternatively be cleared under SMI
control of the ENABLE bits in the C
NTRL
[A/B] registers.
When the circuit breaker trips, /FAULT[A/B] will be
asserted if the outputs were enabled through the hot plug
Interface (non-SMI mode) inputs. At the same time, /INT
will be asserted (unless interrupts are masked). Note that
/INT is de-asserted by writing a logic 1 back into the
respective fault bit position(s) in the STAT[A/B] register or
the Common Status Register.
t
FLT
 is set by external capacitors, C
FIL
[A/B], connected to
the C
FILTER
[A/B] pins. The equation below can be used to
determine the capacitor value for a given duration of t
FLT
:
 
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
E
1second
t
2.0?
C
FLT
FIL
 
Thermal Shutdown
The internal +12V, 12V and VAUX MOSFETs are
protected against damage not only by current limiting, but
by dual-mode over-temperature protection as well. Each
slot controller on the MIC2590B is thermally isolated from
the other. Should an overcurrent condition raise the
junction temperature of one slots controller and internal
pass elements to 140癈, all of the outputs for that slot
(including V
AUX
) will be shut off, and the slots /FAULT
output will be asserted. The other slots operation will
remain unaffected. However, should the MIC2590Bs
overall die temperature exceed 160癈, both slots (all
outputs, including V
AUXA
and V
AUXB
) will be shut off,
whether or not a current-limit condition exists. A 160癈
overtemperature    condition    additionally    sets    the
overtemperature bit (OT_INT) in the Common Status
Register.
A/D Converter
The MIC2590B has a 20-channel, 8-bit A/D converter
capable of monitoring the output voltage and current of
each supply. This information is available via the System
Management Interface. The information is particularly
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