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參數(shù)資料
| 型號： | MIC2591B-5YTQ |
| 廠商： | MICREL INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48 |
| 封裝： | LEAD FREE, TQFP-48 |
| 文件頁數(shù)： | 29/34頁 |
| 文件大?。?/td> | 1920K |
| 代理商： | MIC2591B-5YTQ |
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MIC2591B
Micrel
March 2005
4
M9999-033105
Pin Description
Pin Number
Pin Name
Pin Function
5
12VINA
12V Supply Power and Sense Inputs: Two pins are provided for Kelvin
32
12VINB
connection (one for each slot). Pin 5 is the (+) Kelvin-sense connection to
the supply side of the sense resistor for 12V Slot A. Pin 32 is the (+) Kelvin-
sense connection to the supply side of the sense resistor for 12V Slot B.
These two pins must ultimately connect to each other as close as possible
at the MIC2591B controller in order to eliminate any IR drop between these
pins. An undervoltage lockout circuit (UVLO) prevents the switches from
turning on while this input is less than its lockout threshold.
12
3VINA
3.3V Supply Power and Sense Inputs: Two pins are provided for
25
3VINB
connection (one for each slot). Pin 12 is the (+) Kelvin-sense connection to
the supply side of the sense resistor for 3V Slot A. Pin 25 is the (+) Kelvin-
sense connection to the supply side of the sense resistor for 3V Slot B.
These two pins must ultimately connect to each other as close as possible
at the MIC2591B controller in order to eliminate any IR drop between these
pins. An undervoltage lockout circuit (UVLO) prevents the switches from
turning on while this input is less than its lockout threshold.
16
3VOUTA
3.3V Power-Good Sense Inputs: Connect to 3.3V[A/B] outputs (i.e., the
21
3VOUTB
source terminal of the external power MOSFET). Used to monitor the 3.3V
output voltages for Power-is-Good status.
10
12VOUTA
12V Power-Good Sense Inputs: Connect to 12V[A/B] outputs (i.e., the drain
27
12VOUTB
terminal of the external power MOSFET). Used to monitor the12V output
voltages for Power-is-Good status.
8
12VSENSEA
12V Circuit Breaker Sense Inputs: The current limit thresholds are set
29
12VSENSEB
by connecting sense resistors between these pins and 12VIN[A/B]. When
the current limit threshold of IR = 50mV is reached, the 12VGATE[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 tFLT, the circuit breaker is tripped and the GATE pin for the affected 12V
supply’s external MOSFET is immediately pulled high.
13
3VSENSEA
3V Circuit Breaker Sense Inputs: The current limit thresholds are set by
24
3VSENSEB
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 tFLT, the circuit breaker is tripped and the GATE pin for the affected 3V
supply’s external MOSFET is immediately pulled low.
3
12VGATEA
12V Gate Drive Outputs: Each pin connects to the gate of an external
34
12VGATEB
P-Channel MOSFET. During power-up, the CGATE and the CGS of the
MOSFETs are connected to a 25A current sink. This controls the value of
dv/dt seen at the source of the MOSFETs.
During current limit events, the voltage at this pin is adjusted to maintain
constant current through the switch for a period of tFLT. Whenever an
overcurrent, thermal shutdown, or input undervoltage fault condition occurs,
the GATE pin for the affected slot is immediately brought high. These pins
are charged by an internal current source during power-down. Also, the 3V
supply for the affected slot is shut-down.
14
3VGATEA
3V Gate Drive Outputs: Each pin connects to the gate of an external
23
3VGATEB
N-Channel MOSFET. During power-up, the CGATE and the CGS of the
MOSFETs are connected to a 25A current source. This controls the value
of dv/dt seen at the source of the MOSFETs, and hence the current owing
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 tFLT. 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. Also, the 12V
supply for the affected slot is shut down.
Pin Number
Pin Name
Pin Function
32
12VINB
connection (one for each slot). Pin 5 is the (+) Kelvin-sense connection to
the supply side of the sense resistor for 12V Slot A. Pin 32 is the (+) Kelvin-
25
3VINB
connection (one for each slot). Pin 12 is the (+) Kelvin-sense connection to
16
3VOUTA
3.3V Power-Good Sense Inputs: Connect to 3.3V[A/B] outputs (i.e., the
21
3VOUTB
source terminal of the external power MOSFET). Used to monitor the 3.3V
output voltages for Power-is-Good status.
10
12VOUTA
12V Power-Good Sense Inputs: Connect to 12V[A/B] outputs (i.e., the drain
27
12VOUTB
terminal of the external power MOSFET). Used to monitor the12V output
voltages for Power-is-Good status.
8
12VSENSEA
12V Circuit Breaker Sense Inputs: The current limit thresholds are set
29
12VSENSEB
by connecting sense resistors between these pins and 12VIN[A/B]. When
13
3VSENSEA
3V Circuit Breaker Sense Inputs: The current limit thresholds are set by
24
3VSENSEB
connecting sense resistors between these pins and 3VIN[A/B]. When the
3
12VGATEA
12V Gate Drive Outputs: Each pin connects to the gate of an
34
12VGATEB
P-Channel MOSFET. During power-up, the C
MOSFETs are connected to a 25A current sink. This controls the value of
dv/dt seen at the source of the MOSFETs.
constant current through the switch for a period of t
overcurrent, thermal shutdown, or input undervoltage fault condition occurs,
the GATE pin for the affected slot is immediately brought high.
are charged by an internal current source during power-down.
supply for th
14
3VGATEA
3V Gate Drive Outputs: Each pin connects to the gate of an external
23
3VGATEB
N-Channel MOSFET. During power-up, the C
MOSFETs are connected to a 25A current source. This controls the value
of dv/dt seen at the source of the MOSFETs, and hence the current owing
into the load capacitance.
constant current through the switch for a period of t
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.
supply for the affected slot is shut down.
Pin Number
Pin Name
Pin Function
5
12VINA
12V Supply Power and Sense Inputs: Two pins are provided for Kelvin
32
12VINB
connection (one for each slot). Pin 5 is the (+) Kelvin-sense connection to
the supply side of the sense resistor for 12V Slot A. Pin 32 is the (+) Kelvin-
12
3VINA
3.3V Supply Power and Sense Inputs: Two pins are provided for
25
3VINB
connection (one for each slot). Pin 12 is the (+) Kelvin-sense connection to
16
3VOUTA
3.3V Power-Good Sense Inputs: Connect to 3.3V[A/B] outputs (i.e., the
21
3VOUTB
source terminal of the external power MOSFET). Used to monitor the 3.3V
output voltages for Power-is-Good status.
10
12VOUTA
12V Power-Good Sense Inputs: Connect to 12V[A/B] outputs (i.e., the drain
27
12VOUTB
terminal of the external power MOSFET). Used to monitor the12V output
voltages for Power-is-Good status.
8
12VSENSEA
12V Circuit Breaker Sense Inputs: The current limit thresholds are set
29
12VSENSEB
by connecting sense resistors between these pins and 12VIN[A/B]. When
13
3VSENSEA
3V Circuit Breaker Sense Inputs: The current limit thresholds are set by
24
3VSENSEB
connecting sense resistors between these pins and 3VIN[A/B]. When the
3
12VGATEA
12V Gate Drive Outputs: Each pin connects to the gate of an
34
12VGATEB
P-Channel MOSFET. During power-up, the C
MOSFETs are connected to a 25A current sink. This controls the value of
dv/dt seen at the source of the MOSFETs.
constant current through the switch for a period of t
overcurrent, thermal shutdown, or input undervoltage fault condition occurs,
the GATE pin for the affected slot is immediately brought high.
are charged by an internal current source during power-down.
supply for th
14
3VGATEA
3V Gate Drive Outputs: Each pin connects to the gate of an external
23
3VGATEB
N-Channel MOSFET. During power-up, the C
MOSFETs are connected to a 25A current source. This controls the value
of dv/dt seen at the source of the MOSFETs, and hence the current owing
into the load capacitance.
constant current through the switch for a period of t
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.
supply for the affected slot is shut down.
Pin Number
Pin Name
Pin Function
5
12VINA
12V Supply Power and Sense Inputs: Two pins are provided for Kelvin
32
12VINB
connection (one for each slot). Pin 5 is the (+) Kelvin-sense connection to
the supply side of the sense resistor for 12V Slot A. Pin 32 is the (+) Kelvin-
12
3VINA
3.3V Supply Power and Sense Inputs: Two pins are provided for
25
3VINB
connection (one for each slot). Pin 12 is the (+) Kelvin-sense connection to
16
3VOUTA
3.3V Power-Good Sense Inputs: Connect to 3.3V[A/B] outputs (i.e., the
21
3VOUTB
source terminal of the external power MOSFET). Used to monitor the 3.3V
output voltages for Power-is-Good status.
10
12VOUTA
12V Power-Good Sense Inputs: Connect to 12V[A/B] outputs (i.e., the drain
27
12VOUTB
terminal of the external power MOSFET). Used to monitor the12V output
voltages for Power-is-Good status.
8
12VSENSEA
12V Circuit Breaker Sense Inputs: The current limit thresholds are set
29
12VSENSEB
by connecting sense resistors between these pins and 12VIN[A/B]. When
13
3VSENSEA
3V Circuit Breaker Sense Inputs: The current limit thresholds are set by
24
3VSENSEB
connecting sense resistors between these pins and 3VIN[A/B]. When the
3
12VGATEA
12V Gate Drive Outputs: Each pin connects to the gate of an
34
12VGATEB
P-Channel MOSFET. During power-up, the C
MOSFETs are connected to a 25A current sink. This controls the value of
dv/dt seen at the source of the MOSFETs.
constant current through the switch for a period of t
overcurrent, thermal shutdown, or input undervoltage fault condition occurs,
the GATE pin for the affected slot is immediately brought high.
are charged by an internal current source during power-down.
supply for th
14
3VGATEA
3V Gate Drive Outputs: Each pin connects to the gate of an external
23
3VGATEB
N-Channel MOSFET. During power-up, the C
MOSFETs are connected to a 25A current source. This controls the value
of dv/dt seen at the source of the MOSFETs, and hence the current owing
into the load capacitance.
constant current through the switch for a period of t
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.
supply for the affected slot is shut down.
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