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MIC2593-2BTQ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
Micrel, Inc. MIC2593
September 2008
4
M9999-092208
Pin Number Pin Name Pin Function
6, 31 5VINA, 5VINB
5V Supply Power and Sense Input [A/B]: Pin 6 is the (+) Kelvin-sense
connection to the supply side of the sense resistor for 5V Slot A. Pin 31 is the
(+) Kelvin sense connection to the supply side of the sense resistor for 5V Slot
B. These two pins must ultimately connect to each other within10cm of the
MIC2593. An undervoltage lockout circuit (UVLO) prevents the switches from
turning on while this input is less than its lockout threshold.
7, 30 5VSENSEA, 5VSENSEB
5V Circuit Breaker Sense Input [A/B]: The current limit thresholds are set by
connecting sense resistors between these pins and 5VIN[A/B]. When the
current limit threshold of IR = 50mV is reached, the 5VGATE[A/B] pin is
modulated to maintain a constant voltage across the sense resistor and
therefore a constant current into the load. If the 50mV threshold is exceeded for
t
FLT
(see CFILTER[A/B] pin description), the circuit breaker is tripped and the
GATE pin for the affected supply’s external MOSFET is immediately pulled low.
9, 28 5VOUTA, 5VOUTB
5V Power-Good Sense Inputs: Connect to 5V[A/B] outputs. Used to monitor the
5V output voltages for Power-is-Good status.
8, 29 5VGATEA, 5VGATEB
5V Gate Drive Output [A/B]: Each pin connects to the gate of an external N-
Channel MOSFET. During power-up, the C
GATE
and the C
GS
of the MOSFETs
are charged by a 25µA current source. This controls the value of dv/dt seen at
the source of the MOSFETs, and hence the current flowing into the load
capacitance.
During current-limit events, the voltage at the pin is adjusted to maintain constant
current through the switch for a period of t
FLT
. Whenever an overcurrent, thermal
shutdown, or input undervoltage fault condition occurs, the GATE pin for the
affected slot is immediately brought low.
During power-down, these pins are discharged by an internal current source.
12, 25 3VINA, 3VINB
3.3V Supply Power and Sense Input [A/B]: Pin 12 is the (+) Kelvin-sense
connection to the supply side of the sense resistor for 3.3V Slot A. Pin 25 is the
(+) Kelvin-sense connection to the supply side of the sense resistor for 3.3V Slot
B. These two pins must ultimately connect to each other within 10cm of the
MIC2593. An undervoltage lockout circuit (UVLO) prevents the switches from
turning on while this input is less than its lockout threshold.
13, 24 3VSENSEA, 3VSENSEB
3V Circuit Breaker Sense Input [A/B]: The current limit thresholds are set by
connecting sense resistors between these pins and 3VIN[A/B]. When the
current limit threshold of IR = 50mV is reached, the 3VGATE[A/B] pin is
modulated to maintain a constant voltage across the sense resistor and
therefore a constant current into the load. If the 50mV threshold is exceeded for
t
FLT
(see CFILTER[A/B] pin description), the circuit breaker is tripped and the
GATE pin for the affected supply’s external MOSFET is immediately pulled low.
16, 21 3VOUTA, 3VOUTB
3.3V Power-Good Sense Inputs: Connect to 3.3V[A/B] outputs. Used to monitor
the 3.3V output voltages for Power-is-Good status.
14, 23 3VGATEA, 3VGATEB
3V Gate Drive Output [A/B]: Each pin connects to the gate of an external N-
channel MOSFET. During power-up, the C
GATE
and the C
GS
of the MOSFETs
are connected to a 25µA current source. This controls the value of dv/dt seen at
the source of the MOSFETs, and hence the current flowing into the load
capacitance.
During current limit events, the voltage at this pin is adjusted to maintain
constant current through the switch for a period of t
FLT
. Whenever an
overcurrent, thermal shutdown, or input undervoltage fault condition occurs, the
GATE pin for the affected slot is immediately brought low. During power down,
these pins are discharged by an internal current source.
11, 26 VSTBYA, VSTBYB
.3V Standby Input Voltage: Required to support PCI VAUX output. Additionally,
the SMBus logic and internal registers run off of VSTBY[A/B] to ensure that the
MIC2593 is accessible during standby modes. A UVLO circuit prevents turn-on
of this supply until VSTBY[A/B] rises above its UVLO threshold. Both pins must
be connected together externally at the IC.
Micrel, Inc. MIC2593
September 2008
5
M9999-092208
Pin Number Pin Name Pin Function
15, 22 VAUXA, VAUXB
3.3VAUX[A/B] Output to PCI Card Slot: These outputs connect the 3.3AUX pin
of the PCI connectors to VSTBY[A/B] via internal 400m MOSFETs. These
outputs are current limited and protected against short-circuit faults.
44, 43 ONA, ONB
Enable Inputs: Rising-edge triggered. Used to enable or disable the MAINA and
MAINB (5V, 3.3V, +12V and –12V) outputs. Taking ON[A/B] low after a fault
resets the 5V, 3.3V, +12V and/or –12V fault latches for the affected slot. Tie
these pins to GND if using SMI power control. Also, see pin description for
/FAULTA and /FAULTB.
45, 42 AUXENA, AUXENB
Enable Inputs: Rising-edge triggered. Used to enable or disable VAUXA and
VAUXB outputs. Taking AUXEN[A/B] low after a fault resets the respective slot’s
Aux Output Fault Latch. Tie these pins to GND if using SMI power control. Also,
see pin description for /FAULTA and /FAULTB.
2, 35 CFILTERA, CFILTERB
Overcurrent Timer (Filter) Capacitor [A/B]: Capacitors connected between these
pins and GND set the duration of t
FLT
. t
FLT
is the amount of time for which a slot
remains in current limit before its circuit breaker is tripped.
1, 36 /FAULTA, /FAULTB
/FAULT[A/B] Outputs: Open-drain, active-low. Asserted whenever the circuit
breaker trips due to a fault condition (overcurrent, input undervoltage,
overtemperature). Each pin requires an external pull-up resistor to VSTBY.
Bringing the slot’s ON[A/B] pin low resets /FAULT[A/B] if /FAULT[A/B] was
asserted in response to a fault condition on one of the slot’s MAIN outputs (5V,
3.3V, +12V, or –12V).
/FAULT[A/B] is reset by bringing the slot’s AUXEN[A/B] pin low if /FAULT[A/B]
was asserted in response to a fault condition on the slot’s VAUX output. If a fault
condition occurred on both the MAIN and VAUX[A/B] outputs of the same slot,
then both ON[A/B] and AUXEN[A/B] must be brought low to de-assert the
/FAULT[A/B] output.
4, 38 GPIA, GPIB
General Purpose Inputs: The states of these two inputs are available by reading
the Common Status Register, Bits [4:5]. If not used, connect each pin to GND.
40, 41 A1, A0
SMBus Address Select Pins: Connect to ground or leave open in order to 41 A0
program device SMBus base address. These inputs have internal pull-up
resistors to VSTBY[A/B].
48 SDA SMBus Data: Bidirectional SMBus data line.
47 SCL SMBus Clock: Input.
37 /INT
Interrupt Output: Open-drain, active-low. Asserted whenever a power fault is
detected if the INTMSK bit (CS Register Bit D[3]) is a logical "0". This output is
de-asserted by performing an "echo reset" to the appropriate fault bit(s) in the
STAT[A/B] and/or CS registers. This pin requires an external pull-up resistor to
V
STBY
.
33, 46 GND
IC Ground Connections: Tie directly to the system’s analog ground plane
directly at the device.
Micrel, Inc. MIC2593
September 2008
6
M9999-092208
Absolute Maximum Ratings
(1)
Supply Voltage
(12V
IN
) ..........................................................................+14V
(12MV
IN
) .......................................................................–14V
(5V
IN
) ..............................................................................+7V
(3V
IN
), (V
STBY
) .................................................................+7V
Any Logic Pin ....................................................–0.5 to 3.6V
Output Current (FAILT[A/B], /INT, SDA). ....................10mA
Lead Temperature
IR Reflow, Peak Temperature........................ 240 0°C/–5°C
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD Rating
(3)
Human Body Model........................................................ 2kV
Machine Model.............................................................200V
Operating Ratings
(2)
Supply Voltage
(12V
IN
) .................................................... +11.65V to +12.6V
(12MV
IN
) ................................................... –11.0V to –13.2V
(5V
IN
) .......................................................... +4.85V to 5.25V
(3V
IN
) ............................................................ +3.1V to +3.6V
(V
STBY
) .......................................................... +3.15V to 3.6V
Ambient Temperature (T
A
) .............................. 0°C to +70°C
Junction Temperature (T
J
) ......................................... 125°C
Thermal Resistance
TQFP (θ
JA
) ......................................................56.5°C/W
Electrical Characteristics
(4)
12V
IN[A/B]
= 12V; 12MV
IN[A/B]
= –12V; 5V
IN[A/B]
= 5V; 3V
IN[A/B]
= 3.3V; V
STBY[A/B]
= 3.3V; T
A
= 25°C; unless otherwise noted.
Bold indicates specification applies over the full operating rating temperature range from 0°C to 70°C.
Symbol Parameter Condition Min Typ Max Units
I
CC12V
I
CC5V
I
CC3.3V
I
CC12MV
I
CCVSBY
Supply Current 0.6
1.2
0.5
–1.0
2.5
2.0
2.0
0.7
–2.0
5.0
mA
mA
mA
mA
mA
V
UVLO(12V)
V
UVLO(3V)
V
UVLO(5V)
V
UVLO(12MV)
V
UVLO(STBY)
Under Voltage Lockout Thresholds
12V
IN
[A/B]
3V
IN
[A/B]
5V
IN
[A/B]
12MV
IN
[A/B]
V
STBY
[A/B]
12V
IN
increasing
3V
IN
increasing
5V
IN
increasing
12MV
IN
increasing
V
STBY
increasing
8
2.2
3.7
–10
2.8
9
2.5
4.0
–9
2.9
10
2.75
4.3
–8
3.0
V
V
V
V
V
V
HYSUV
Under Voltage Lockout Hysteresis -
12V
IN
, 12MV
IN
, 5V
IN
, 3V
IN
180 mV
V
HYSSTBY
Under-voltage Lockout Hysteresis -
V
STBY
50 mV
V
UVTH(12V)
V
UVTH(12MV)
V
UVTH(3V)
V
UVTH(5V)
V
UVTH(VAUX)
Power Good Under-Voltage Thresholds
12V
OUT
[A/B]
12MV
OUT
[A/B]
3V
OUT
[A/B]
5V
OUT
[A/B]
V
AUX
[A/B]
12V
OUT
[A/B] decreasing
12MV
OUT
[A/B] decreasing
3V
OUT
[A/B] decreasing
5V
OUT
[A/B] decreasing
V
AUX
[A/B] decreasing
10.2
–10.8
2.7
4.4
2.7
10.5
–10.6
2.8
4.5
2.8
10.8
–10.2
2.9
4.7
2.9
V
V
V
V
V
V
HYSPG
Power-Good Detect Hysteresis 30 mV
V
GATE
5V
GATE
/3V
GATE
Voltage
12V
IN
–15
12V
IN
V
I
GATE(SOURCE)
5V
GATE
/3V
GATE
Charge Current start cycle
15
25
35
µA
I
GATE(SINK
) 5V
GATE
/3V
GATE
Sink Current (Fault Off) any fault condition, V
GATE
= 5V 70 mA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

MIC2593-2BTQ

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IC CTRLR HOTPLUG PCI DUAL 48TQFP
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