MAX5954LETX+ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX5954LETX+ ,Single PCI Express, Hot-Plug Controllerapplications. The device provides hot-plug♦ Hot Swaps 12V, 3.3V, and 3.3V Auxiliary for a control f ..
MAX5955AEEE+ ,Low-Voltage, Dual Hot-Swap Controllers with Independent On/Off ControlFeaturesThe MAX5955 and MAX5956 are +1V to +13.2V dual ♦ Safe Hot Swap for +1V to +13.2V Power Supp ..
MAX5955AEEE+ ,Low-Voltage, Dual Hot-Swap Controllers with Independent On/Off ControlFeaturesThe MAX5955 and MAX5956 are +1V to +13.2V dual ♦ Safe Hot Swap for +1V to +13.2V Power Supp ..
MAX5955AEEE+ ,Low-Voltage, Dual Hot-Swap Controllers with Independent On/Off ControlApplicationsPGOOD1 1 16 PGOOD2Base Station Line Cards Power-Supply Sequencing TIM 2 15 ON2IN1 3 14 ..
MAX5955AEEE+T ,Low-Voltage, Dual Hot-Swap Controllers with Independent On/Off ControlELECTRICAL CHARACTERISTICS(V = +1V to +13.2V provided at least one supply is higher than +2.7V, V = ..
MAX5955BUEE+T ,Low-Voltage, Dual Hot-Swap Controllers with Independent On/Off ControlApplicationsPGOOD1 1 16 PGOOD2Base Station Line Cards Power-Supply Sequencing TIM 2 15 ON2IN1 3 14 ..
MAZ8180G ,Silicon planar typeFeatures Package Extremely low noise voltage caused from the diode (2.4 V to Code 39V, 1/3 to 1 ..
MAZ8180-H ,Silicon planar typeElectrical characteristics within part numbers T = 25°CaTemperaturecoefficient ofZener voltage Rev ..
MAZ8180-L ,Silicon planar typeAbsolute Maximum Ratings T = 25°CaMarking SymbolParameter Symbol Rating UnitRefer to the list of t ..
MAZ8180-M ,Silicon planar typeelectrical characteristicsZ Zwithin part numbersReverse current I V ··············· Specified value ..
MAZ8200G ,Silicon planar typeElectrical Characteristics T = 25°C±3°CaParameter Symbol Conditions Min Typ Max UnitForward voltag ..
MAZ8200G ,Silicon planar typeAbsolute Maximum Ratings T = 25°CaParameter Symbol Rating UnitRepetitive peak forward current I 20 ..

MAX5954LETX+
Single PCI Express, Hot-Plug Controller
General Description
The MAX5954 hot-plug controller is designed for PCI
Express™ applications. The device provides hot-plug
control for 12V, 3.3V, and 3.3V auxiliary supplies of a sin-
gle PCI Express (PCI-E) slot. The MAX5954’s logic
inputs/outputs allow interfacing directly with the system
hot-plug management controller or through an SMBus™
with an external I/O expander. Integrated debounced
attention switch and present-detect signals are included
to simplify system design.
The MAX5954 drives two external n-channel MOSFETs
to control the 12V and 3.3V main outputs. The 3.3V aux-
iliary output is controlled through an internal 0.3Ω
n-channel MOSFET. An internal charge pump provides
gate drive for the 12V output while the gate drive of the
3.3V output is driven by the 12V input supply. The 3.3V
auxiliary output is completely independent from the
main outputs with its own charge pump.
At power-up, the MAX5954 keeps all of the external
MOSFETs off until the supplies rise above their respec-
tive undervoltage-lockout (UVLO) thresholds. The
device keeps the internal MOSFET off only until the aux-
iliary input supply rises above its UVLO threshold. Upon
a turn-on command, the MAX5954 enhances the exter-
nal and internal MOSFETs slowly with a constant gate
current to limit the power-supply inrush current. The
MAX5954 actively limits the current of all outputs at all
times and shuts down if an overcurrent condition per-
sists for longer than a programmable overcurrent time-
out. Thermal-protection circuitry also shuts down all
outputs if the die temperature exceeds +150°C. After an
overcurrent or overtemperature fault condition, the
MAX5954L latches off while the MAX5954A automatical-
ly restarts after a restart time delay. The device is avail-
able in a 36-pin (6mm ×6mm) thin QFN package and
operates over the -40°C to +85°C temperature range.
Applications
Servers
Desktop Mobile Server Platforms
Workstations
Embedded Devices
FeaturesPCI Express CompliantHot Swaps 12V, 3.3V, and 3.3V Auxiliary for a
Single PCI-E SlotIntegrated Power MOSFET for Auxiliary Supply
RailControls dI/dt and dV/dtActive Current Limiting Protects Against
Overcurrent/Short-Circuit ConditionsProgrammable Current-Limit TimeoutPWRGDSignal Output with Programmable
Power-On Reset (POR) (160ms Default)Latched FAULTSignal Output after Overcurrent
or Overtemperature FaultAttention Switch Input/Output with 4.4ms
DebouncePresent-Detect InputForced-On Input Facilitates TestingThermal ShutdownAllows Control through SMBus with an I/O
Expander
MAX5954
Single PCI Express, Hot-Plug
Controller
19-3914; Rev 1; 1/06
EVALUATION KIT
AVAILABLE
N.C.
N.C.
3.3VAUXIN
PWRGD
FAULT
3.3G
N.C.28
THIN QFN
MAX5954
TOP VIEW
3.3VAUXO
N.C.T1N.C.N.C.N.C.N.C.N.C.N.C.N.C.
N.C.
OUTPUT
INPUT
GND
PGND
PORADJ
TIM
12VIN
N.C.
AUXON
12S+
12G
3.3S+
3.3S-
PRES-DET
12S-
FON26252423222120193456789
Pin Configuration
Ordering Information
PARTTEMP RANGEPIN-
PACKAGE
PKG
CODE
MAX5954AETX+-40°C to +85°C36 Thin QFNT3666-3
MAX5954LETX+-40°C to +85°C36 Thin QFNT3666-3
Typical Application Circuit appears at end of data sheet.
SMBus is a trademark of Intel Corp.
PCI Express is a trademark of PCI-SIG Corp.
+Denotes lead free package.
MAX5954
Single PCI Express, Hot-Plug
Controller
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
(All voltages referenced to GND, unless otherwise noted.)
12VIN......................................................................-0.3V to +14V
12G............................................................-0.3V to (V12VIN+ 6V)
12S, 12S-, 3.3G......................................-0.3V to (V12VIN+ 0.3V)
3.3VAUXIN, ON, FAULT..........................................-0.3V to +6V
PWRGD....................................................................-0.3V to +6V
PGND....................................................................-0.3V to +0.3V
All Other Pins to GND......................-0.3V to (V3.3VAUXIN+ 0.3V)
Continuous Power Dissipation (TA= +70°C)
36-Pin Thin QFN (derate 26.3mW/°C above +70°C).....2.105W
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS
(V12VIN= V12S-= V12S+= 12V, V3.3S+= V3.3S-= V3.3VAUXIN= VON= VAUXON = VFON = 3.3V, PWRGD= FAULT= PORADJ = TIM =
OUTPUT = 12G = 3.3G = OPEN, INPUT = PRES-DET= PGND = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values
are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
12V SUPPLY
12V Supply Voltage RangeV12VIN10.81213.2V
V12VIN rising9.51010.512VIN Undervoltage LockoutV12UVLOHysteresis0.1V
12VIN Supply CurrentI12VINV12VIN = 13.2V0.51mA
12VIN CONTROL
12VIN Current-Limit
Threshold (V12S+ - V12S-)V12ILIM495459mV
12G Gate Charge CurrentI12G_CHGV12G = GND456µA
Normal turn-off, ON = GND, V12G = 2V50150250µA
12G Gate Discharge CurrentI12G_DISO utp ut shor t- ci r cui t cond i ti on, str ong g ate p ul l d ow n
to r eg ul ati on, V 1 2V IN - V 1 2S _ ≥ 1V , V 1 2G_= 5V 50120180mA
12G Gate High Voltage
(V12G - V12VIN)V12GHI12G = 1µA4.85.35.8V
12G Threshold Voltage For
PWRGD AssertionVPGTH12Referred to V12VIN, I12G_ = 1µA (Note 2)3.044.8V
12S- Input Bias Current1µA
12S+ Input Bias Current2060µA
3.3V SUPPLY
3.3V Supply Voltage RangeV3.3S+3.03.33.6V
3.3S+ rising2.522.652.78VUndervoltage Lockout
(Note 3)Hysteresis30mV
MAX5954
Single PCI Express, Hot-Plug
Controller
ELECTRICAL CHARACTERISTICS (continued)
(V12VIN= V12S-= V12S+= 12V, V3.3S+= V3.3S-= V3.3VAUXIN= VON= VAUXON = VFON = 3.3V, PWRGD= FAULT= PORADJ = TIM =
OUTPUT = 12G = 3.3G = OPEN, INPUT = PRES-DET= PGND = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values
are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
3.3V CONTROL
3.3V Current-Limit Threshold
(V3.3S+ - V3.3S-)V3.3ILIM172023mV
3.3G Gate Charge CurrentI3.3G CHGV3.3G = GND456µA
ON = GND, V3.3G = 2V50150250µA
3.3G Gate Discharge CurrentI3.3G_DISO utp ut shor t- ci r cui t cond i ti on, str ong g ate p ul l d ow n
to r eg ul ati on, V 3 .3 S + - V 3 .3 S ≥ 1V , V 3 .3 G = 5V 100150220mA
3.3G Gate High Voltage
(V3.3G - V3.3S+)V3.3G_HSourcing 1µA4.55.56.8V
3.3G Threshold Voltage For
PWRGD AssertionVPGTH3.3Referred to V3.3VAUXIN, I3.3G = 1µA (Note 2)-3.0+4+4.5V
3.3S- Input Bias Current1µA
3.3S+ Input Bias Current2060µA
3.3V AUXILIARY SUPPLY
3.3VAUXIN Supply Voltage
RangeV3.3VAUXIN3.03.33.6V
3.3VAUXIN rising2.522.652.78V3.3VAUXIN Undervoltage
LockoutV 3 .3 V A U X U V L OHysteresis30mV
3.3VAUXIN Supply CurrentV3.3VAUXIN = 3.6V1.53mA
3.3VAUXIN to 3.3VAUXO
Maximum DropoutI3.3VAUXO = 375mA225mV
3.3VAUXO Current-Limit
Threshold3.3VAUXO shorted to GND376470564mA
3.3VAUXO Threshold For
PWRGD Assertion
(V3.3VAUXIN - V3.3VAUXO)
VPGTH3.3AUX(Note 3)400mV
LOGIC SIGNALS
Rising edge1.02.0VInput-Logic Threshold
(ON, FON, AUXON,
PRES-DET, INPUT)Hysteresis25mV
Input Bias Current
(ON, AUXON, INPUT)1µA
FON, PRES-DET Internal
Pullup255075kΩ
ON, AUXON High-to-Low
Deglitch Time4µs
MAX5954
Single PCI Express, Hot-Plug
Controller
ELECTRICAL CHARACTERISTICS (continued)
(V12VIN= V12S-= V12S+= 12V, V3.3S+= V3.3S-= V3.3VAUXIN= VON= VAUXON = VFON = 3.3V, PWRGD= FAULT= PORADJ = TIM =
OUTPUT = 12G = 3.3G = OPEN, INPUT = PRES-DET= PGND = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values
are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
PRES-DET High-to-Low
Deglitch TimetDEG357ms
PORADJ = open90160250
RPORADJ = 20kΩ355575
RPORADJ = 100kΩ145265380
PWRGD Power-On Reset
Time (Note 2)tPOR_HL
RPORADJ = 200kΩ570
PWRGD Low-to-High Deglitch
TimetPOR_LH4µs
Sinking 2mA0.1PWRGD, FAULT Output Low
VoltageSinking 30mA0.7V
PWRGD, FAULT Output-High
Leakage CurrentVPWRGD = VFAULT = 5.5V1µA
TIM = open5.51117.0
RTIM = 15kΩ1.42.63.8
RTIM = 120kΩ122232FAULT TimeouttFAULT
RTIM = 300kΩ59
FAULT Timeout During
StartuptSU2 x tFAULTms
Autorestart Delay TimetRESTART64 x tFAULTms
Fault Reset Minimum Pulse
WidthtRESET(Note 4)100µs
Thermal-Shutdown ThresholdTSDTJ rising+150°C
Thermal-Shutdown Threshold
Hysteresis20°C
OUTPUT Debounce TimetDBC2.64.46.2ms
OUTPUT High VoltageSourcing 2mAV3.3VAUXIN
- 0.3V 3.3 V AU X IN V
OUTPUT Low VoltageSinking 2mA0.4V
Note 1:100% production tested at TA= +25°C. Parameters over temperature are guaranteed by design.
Note 2:PWRGDasserts a time tPOR_HLafter VPGTH12, VPGTH3.3, and VPGTH3.3AUXconditions are met.
Note 3:The UVLO for the 3.3V supply is sensed at 3.3S+.
Note 4:This is the time that ON or AUXON must stay low when resetting a fault condition.
MAX5954
Single PCI Express, Hot-Plug
Controller
12VIN INPUT SUPPLY CURRENT
vs. TEMPERATURE
MAX5954 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (mA)3510-15
3.3VAUXIN SUPPLY CURRENT
vs. TEMPERATURE
MAX5954 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)3510-15
ON AND AUXON LOW-TO-HIGH THRESHOLD
VOLTAGE vs. TEMPERATURE
MAX5954 toc03
TEMPERATURE (°C)
THRESHOLD VOLTAGE (V)3510-15
3.3VAUXO OUTPUT VOLTAGE vs. CURRENT
MAX5954 toc04
OUTPUT CURRENT (A)
OUTPUT VOLTAGE (V)
12G AND 3.3G GATE CHARGE
CURRENT vs. TEMPERATURE
MAX5954 toc05
TEMPERATURE (°C)
GATE CHARGE CURRENT (3510-15
12G
3.3G
12G AND 3.3G GATE DISCHARGE
CURRENT vs. TEMPERATURE
MAX5954 toc06
TEMPERATURE (°C)
GATE DISCHARGE CURRENT (3510-15
3.3G
12G
3.3VAUX INTERNAL SWITCH
MAXIMUM DROPOUT vs. TEMPERATURE
MAX5954 toc07
TEMPERATURE (°C)
DROPOUT VOLTAGE (V)3510-15
AUXILIARY OUTPUT CURRENT = 375mA
12V AND 3.3V CURRENT-LIMIT THRESHOLD
VOLTAGE vs. TEMPERATURE
MAX5954 toc08
TEMPERATURE (°C)
CURRENT-LIMIT THRESHOLD VOLTAGE (mV)3510-15
12V CURRENT-SENSE
THRESHOLD
3.3V CURRENT-SENSE
THRESHOLD
AUXILIARY CURRENT LIMIT
vs. TEMPERATURE
MAX5954 toc09
TEMPERATURE (°C)
AUXILIARY CURRENT LIMIT (A)3510-15
Typical Operating Characteristics
(V12VIN= V12S+= 12V, V3.3VAUXIN= V3.3S+= VON= VAUXON= VINPUT= 3.3V, PRES-DET= GND, FON = PORADJ = TIM = float,
FAULT= 10kΩto 3.3VAUXIN, PWRGD= 10kΩto 3.3VAUXO, TA= +25°C, unless otherwise noted, see the Typical Application
Circuit.)
MAX5954
Single PCI Express, Hot-Plug
Controller
Typical Operating Characteristics (continued)
(V12VIN= V12S+= 12V, V3.3VAUXIN= V3.3S+= VON= VAUXON= VINPUT= 3.3V, PRES-DET= GND, FON = PORADJ = TIM = float,
FAULT= 10kΩto 3.3VAUXIN, PWRGD= 10kΩto 3.3VAUXO, TA= +25°C, unless otherwise noted, see the Typical Application
Circuit.)
12VIN UNDERVOLTAGE-LOCKOUT
THRESHOLD vs. TEMPERATURE
MAX5954 toc10
TEMPERATURE (°C)
UVLO THRESHOLD (V)35-1510
3.3VAUXIN UNDERVOLTAGE-LOCKOUT
THRESHOLD vs. TEMPERATURE
MAX5954 toc11
TEMPERATURE (°C)
UVLO THRESHOLD (V)3510-15
12V TURN-ON/OFF TIME
MAX5954 toc12
12G
20V/div
PWRGD
5V/div
5V/div
12V OUTPUT
10V/div
40ms/div
3.3V TURN-ON/OFF TIME
MAX5954 toc13
3.3G
10V/div
PWRGD
5V/div
5V/div
3.3V OUTPUT
5V/div
40ms/div
3.3V AUXILIARY TURN-ON/OFF TIME
MAX5954 toc14
40ms/div
3.3AUXO
OUTPUT VOLTAGE
2V/div
AUXON
2V/div
PWRGD
2V/div
12V POWER-UP
MAX5954 toc15
12V OUTPUT
10V/div
PWRGD
5V/div
12VIN, 12V INPUT
10V/div
12G
20V/div
40ms/div
MAX5954
Single PCI Express, Hot-Plug
Controllerypical Operating Characteristics (continued)
(V12VIN= V12S+= 12V, V3.3VAUXIN= V3.3S+= VON= VAUXON= VINPUT= 3.3V, PRES-DET= GND, FON = PORADJ = TIM = float,
FAULT= 10kΩto 3.3VAUXIN, PWRGD= 10kΩto 3.3VAUXO, TA= +25°C, unless otherwise noted, see the Typical Application
Circuit.)
3.3V INPUT/3.3V AUXILIARY INPUT
POWER-UP
MAX5954 toc16
3.3V OUTPUT
5V/div
PWRGD
5V/div
3.3VAUXO
5V/div
3.3G
10V/div
100ms/div
3.3S+
5V/div
TURN-ON DELAY 3.3V OUTPUT AND
3.3V AUXILIARY OUTPUT
MAX5954 toc17
4ms/div
5V/div
5V/div
5V/div
5V/div
10V/div
3.3VAUXO
OUTPUT VOLTAGE
3.3 VOLTAGE
3.3 INPUT,
3.3VAUXIN
3.3G
PWRGD
FAULT CONDITION ON 12V OUTPUT
(AUTORESTART OPTION MAX5954A)
MAX5954 toc18
12G
20V/div
FAULT
5V/div
12V OUTPUT CURRENT
5A/div
100ms/div
12V OUTPUT VOLTAGE
10V/div
tRESTART
RLOAD STEP TO 1.5Ω
FAULT CONDITION ON 3.3V OUTPUT
(AUTORESTART OPTION MAX5954A)
MAX5954 toc19
3.3G
10V/div
FAULT
5V/div
3.3V MAIN OUTPUT CURRENT
2A/div
100ms/div
3.3V OUTPUT VOLTAGE
5V/div
tRESTART
RLOAD STEP TO 0.5Ω
FAULT CONDITION ON AUXILIARY OUTPUT
(AUTORESTART OPTION MAX5954A)
MAX5954 toc20
FAULT
2V/div
3.3VAUXO OUTPUT CURRENT
500mA/div
100ms/div
3.3VAUXO OUTPUT VOLTAGE
2V/div
tRESTART
RLOAD STEP TO 4Ω
FAULT CONDITION ON 12V OUTPUT
(LATCH OPTION MAX5954L)
MAX5954 toc21
12G
20V/div
FAULT
5V/div
12V OUTPUT CURRENT
5A/div
100ms/div
12V OUTPUT VOLTAGE
10V/div
RLOAD STEP TO 1.5Ω
MAX5954
Single PCI Express, Hot-Plug
Controller
Typical Operating Characteristics (continued)
(V12VIN= V12S+= 12V, V3.3VAUXIN= V3.3S+= VON= VAUXON= VINPUT= 3.3V, PRES-DET= GND, FON = PORADJ = TIM = float,
FAULT= 10kΩto 3.3VAUXIN, PWRGD= 10kΩto 3.3VAUXO, TA= +25°C, unless otherwise noted, see the Typical Application
Circuit.)
FAULT CONDITION ON 12V OUTPUT
MAX5954 toc22
12G
20V/div
FAULT
5V/div
12V OUTPUT CURRENT
5A/div
4ms/div
12V OUTPUT VOLTAGE
10V/div
RLOAD
STEP TO 1.5ΩtFAULT
FAULT CONDITION ON 3.3V OUTPUT
(LATCH OPTION MAX5954)
MAX5954 toc23
3.3G
10V/div
FAULT
5V/div
3.3V OUTPUT CURRENT
2A/div
100ms/div
3.3V OUTPUT VOLTAGE
5V/div
RLOAD STEP TO 0.5Ω
FAULT CONDITION ON 3.3V MAIN OUTPUT
MAX5954 toc24
3.3G
10V/div
FAULT
5V/div
3.3V OUTPUT CURRENT
2A/div
4ms/div
3.3V OUTPUT VOLTAGE
5V/div
RLOAD
STEP TO 0.5ΩtFAULT
FAULT CONDITION ON AUXILIARY OUTPUT
(LATCH OPTION MAX5954)
MAX5954 toc25
FAULT
2V/div
3.3VAUXO OUTPUT CURRENT
500mA/div
100ms/div
3.3VAUXO OUTPUT VOLTAGE
2V/div
RLOAD STEP TO 4Ω
FAULT CONDITION ON AUXILIARY OUTPUT
MAX5954 toc26
FAULT
2V/div
3.3VAUXO OUTPUT CURRENT
500mA/div
4ms/div
3.3VAUXO OUTPUT VOLTAGE
2V/div
RLOAD
STEP TO 4ΩtFAULT
SHORT CIRCUIT ON 12V OUTPUT
MAX5954 toc27
12G
20V/div
FAULT
5V/div
12V OUTPUT CURRENT
5A/div
2ms/div
12V OUTPUT VOLTAGE
10V/div
MAX5954
Single PCI Express, Hot-Plug
Controllerypical Operating Characteristics (continued)
(V12VIN= V12S+= 12V, V3.3VAUXIN= V3.3S+= VON= VAUXON= VINPUT= 3.3V, PRES-DET= GND, FON = PORADJ = TIM = float,
FAULT= 10kΩto 3.3VAUXIN, PWRGDA= 10kΩto 3.3VAUXO, TA= +25°C, unless otherwise noted, see the Typical Application
Circuit.)
SHORT CIRCUIT ON 12V OUTPUT
MAX5954 toc28
12G
20V/div
FAULT
5V/div
12V OUTPUT CURRENT
25A/div
4μs/div
12V OUTPUT VOLTAGE
10V/div
SHORT CIRCUIT ON 3.3V OUTPUT
MAX5954 toc29
3.3G
5V/div
FAULT
5V/div
3.3V OUTPUT CURRENT
2A/div
2ms/div
3.3V OUTPUT VOLTAGE
5V/div
SHORT CIRCUIT ON 3.3V OUTPUT
MAX5954 toc30
3.3G
5V/div
FAULT
5V/div
3.3V OUTPUT CURRENT
10A/div
2μs/div
3.3V OUTPUT VOLTAGE
5V/div
SHORT CIRCUIT ON 3.3AUXO_
MAX5954 toc31
FAULT
5V/div
3.3VAUXO OUTPUT CURRENT
500mA/div
2ms/div
3.3VAUXO OUTPUT VOLTAGE
2V/div
SHORT CIRCUIT ON 3.3VAUXO_
MAX5954 toc32
FAULT
5V/div
3.3VAUXO OUTPUT CURRENT
5A/div
2μs/div
3.3VAUXO OUTPUT VOLTAGE
2V/div
POWER-UP INTO FAULT
(AUXILIARY SUPPLY)
MAX5954 toc33
3.3VAUXO OUTPUT VOLTAGE
2V/div
FAULT
5V/div
3.3VAUXO OUTPUT CURRENT
500mA/div
4ms/div
AUXON
5V/div
tSU
RLOAD = 4Ω
MAX5954
Single PCI Express, Hot-Plug
Controller
Typical Operating Characteristics (continued)
(V12VIN= V12S+= 12V, V3.3VAUXIN= V3.3S+= VON= VAUXON= VINPUT= 3.3V, PRES-DET= GND, FON = PORADJ = TIM = float,
FAULT= 10kΩto 3.3VAUXIN, PWRGDA= 10kΩto 3.3VAUXO, TA= +25°C, unless otherwise noted, see the Typical Application
Circuit.)
POWER-UP INTO FAULT
(3.3V MAIN)
MAX5954 toc34
3.3V OUTPUT VOLTAGE
2V/div
FAULT
5V/div
3.3V OUTPUT CURRENT
4A/div
4ms/div
ON, AUXON
5V/div
tSU
RLOAD = 0.5Ω
3.3G
5V/div
POWER-UP INTO FAULT
(12V OUTPUT)
MAX5954 toc35
12V OUTPUT VOLTAGE
10V/div
FAULT
5V/div
12V OUTPUT CURRENT
5A/div
4ms/div
ON, AUXON
5V/div
tSU
12G
10V/div
PRESENT-DETECT (ON/OFF) OPERATION
MAX5954 toc36
40ms/div
5V/div
5V/div
5V/div
10V/div12V OUTPUT VOLTAGE
3.3VAUXO
OUTPUT VOLTAGE
PWRGD
PRES-DET
PRESENT-DETECT (ON/OFF) OPERATION
MAX5954 toc37
4ms/div
5V/div
5V/div
5V/div
10V/div12V OUTPUT VOLTAGE
3.3VAUXO
OUTPUT VOLTAGE
PWRGD
PRES-DET
FORCED-ON (ON/OFF) OPERATION
MAX5954 toc38
40ms/div
5V/div
5V/div
5V/div
10V/div12V OUTPUT VOLTAGE
3.3VAUXO
OUTPUT VOLTAGE
PWRGD
FON
FORCED-ON (ON/OFF) OPERATION
MAX5954 toc39
4ms/div
5V/div
5V/div
5V/div
10V/div12V OUTPUT VOLTAGE
3.3VAUXO
OUTPUT VOLTAGE
PWRGD
FON
MAX5954
Single PCI Express, Hot-Plug
Controller
Typical Operating Characteristics (continued)
(V12VIN= V12S+= 12V, V3.3VAUXIN= V3.3S+= VON= VAUXON= VINPUT= 3.3V, PRES-DET= GND, FON = PORADJ = TIM = float,
FAULT= 10kΩto 3.3VAUXIN, PWRGDA= 10kΩto 3.3VAUXO, TA= +25°C, unless otherwise noted, see the Typical Application
Circuit.)
DEBOUNCED ON/OFF OPERATION
MAX5954 toc40
INPUT
2V/div
10ms/div
OUTPUT
2V/div
POWER-ON RESET TIME
vs. PORADJ RESISTOR
MAX5954 toc41
RPORADJ (KΩ)
tPOR_HL
(MS)
tFAULT TIME DELAY
vs. TIM RESISTOR
MAX5954 toc42
RTIM (kΩ)
FAULT
(ms)

Partno	Mfg	Dc	Qty	Available	Descript
MAX5954LETX+	MAXIM	N/a	22	avai	Single PCI Express, Hot-Plug Controller