MIC2593-2BTQ TR Micrel Inc, MIC2593-2BTQ TR Datasheet - Page 13

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

Specifications of MIC2593-2BTQ 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: Contains lead / RoHS non-compliant
• Other names: MIC2593-2BTQTR; MIC2593-2BTQTR

trip the circuit breaker, but only when the MAIN outputs
are enabled (to signal a supply input brown-out condition).
The VAUX[A/B] outputs have their own separate circuit
breaker functions. VAUX[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 VAUX[A/B]
when the overcurrent fault timer (t
the overcurrent 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 CNTRL[A/B] registers
(See Register Bits D[1:0]). When the circuit breaker trips,
/FAULT[A/B] will be asserted if the outputs were enabled
through the Hot Plug Interface 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. The response time (t
the MIC2593’s primary overcurrent detector is set by
external capacitors at the CFILTER[A/B] pins to GND. For
Slot A, CFILTER[A] is located at Pin 2; for Slot B,
CFILTER[B] is located at Pin 35. For a given response
time, the value for CFILTER[A/B] is given by.
Micrel, Inc.
September 2008
CFILTER[A/
B](
μ
F)
=
12VOUT_UV[A/B]
t
3VOUT_UV[A/B]
Notes:
FLT[A/B]
3VAUX_UV[A/B]
1. Internal flag
2. CNTRL[A/B] Register Bit D[7]
3. CNTRL[A/B] Register Bit D[6]
V
FILTER
FLT
(ms)
) expires. This use of
(V)
(1)
(1)
(1)
×
Figure 7. Power-Good Status Logic Diagram
I
FILTER
×
10
3
(
μ
A
)
FLT
) of
13
where t
and I
Characteristics” table.
Thermal Shutdown
The internal +12V, –12V, and V
protected against damage not only by current limiting, but
by dual-mode overtemperature protection as well. Each
slot controller on the MIC2593 is thermally isolated from
the other. Should an overcurrent condition raise the
junction temperature of one slot’s controller and internal
pass elements to 140°C, all of the outputs for that slot
(including V
output will be asserted. The other slot’s operation will
remain unaffected. However, should the MIC2593’s
overall die temperature exceed 160°C, both slots (all
outputs, including V
whether or not a current limit condition exists. A 160°C
overtemperature
overtemperature bit (OT_INT) in the Common Status
Register.
Output Power-Good Status
For the MIC2593, “Power-is-Good” is valid on a slot when
the outputs of the four MAIN supplies (12V, –12V, 5V, and
3.3V) and the auxiliary supply output are all above their
respective power-good thresholds specified in the
“Electrical Characteristics” table. The power-good status
of either slot is verified by polling the CNTRL[A/B]
Register Bits D[7:6]. CNTRL[A/B] Register Bits D[7] and
D[6] indicate output power-good status for the AUX supply
and MAIN supplies, respectively. Figure7 below illustrates
an equivalent logic circuit that determines the output
power-good status for the MAIN and AUX supplies.
V
V
STBY[A/B]
STBY[A/B]
FILTER
FLT[A/B]
AUX[A/B]PG
MAIN[A/B]PG
and V
AUX
is the selected overcurrent response time
) will be shut off, and the slot’s /FAULT
(2)
FILTER
(3)
condition
AUXA
are specified in the “Electrical
and V
additionally
AUXB
AUX
) will be shut off,
MOSFETs are
M9999-092208
sets
MIC2593
the