MAX5929AEEG+ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX5929AEEG+ ,Low-Voltage, Quad, Hot-Swap Controllers/Power SequencersFeatures♦ Safe Hot Swap for +1V to +15V Power SuppliesThe MAX5927A/MAX5929A–MAX5929D +1V to +15Vqua ..
MAX5929LHEEG ,Low-Voltage, Quad, Hot-Swap Controllers/Power SequencersFeaturesThe MAX5927/MAX5929 +1V to +13.2V quad hot-swap ♦ Safe Hot Swap for +1V to +13.2V Power Sup ..
MAX5930EEG+T ,Low-Voltage, Triple, Hot-Swap Controllers/Power Sequencers/Voltage TrackersFeaturesThe MAX5930/MAX5931 +1V to +13.2V triple hot-swap♦ Safe Hot Swap for +1V to +13.2V Power Su ..
MAX5932ESA ,Positive High-Voltage, Hot-Swap ControllerFeaturesThe MAX5932 is a fully integrated hot-swap controller for♦ Pin and Function Compatible with ..
MAX5932ESA+ ,Positive High-Voltage, Hot-Swap ControllerELECTRICAL CHARACTERISTICS(V = +24V, GND = 0V, T = -40°C to +85°C, unless otherwise noted. Typical ..
MAX5933BESA ,Positive High-Voltage, Hot-Swap Controllersfeatures suchBackplanesas a choice of active-high or active-low power-good out-puts (PWRGD/PWRGD), ..
MAZ8100-M ,Silicon planar typeElectrical Characteristics T = 25°CaParameter Symbol Conditions Min Typ Max UnitForward voltage V ..
MAZ8100-M ,Silicon planar typeelectrical characteristicsZ Zwithin part numbersReverse current I V ··············· Specified value ..
MAZ8110G ,Silicon planar typeElectrical Characteristics within Part Numbers T = 25°C±3°CaTemperatureZener Zener riseReversecoef ..
MAZ8110-H ,Silicon planar typeZener DiodesMAZ8000 SeriesSilicon planar typeUnit : mmFor stabilization of power supplyKA
MAZ8110-L ,Silicon planar typeElectrical characteristics within part numbers T = 25°CaTemperaturecoefficient ofZener voltage Rev ..
MAZ8110-M ,Silicon planar typeFeatures•Extremely low noise voltage caused from the diode (2.4V to 39V,1/3 to 1/10 of our conventi ..

MAX5929AEEG+
Low-Voltage, Quad, Hot-Swap Controllers/Power Sequencers
General Description
The MAX5927A/MAX5929A–MAX5929D +1V to +15V
quad hot-swap controllers provide complete protection
for multisupply systems. They allow the safe insertion
and removal of circuit cards into live backplanes. These
devices hot swap multiple supplies ranging from +1V to
+15V, provided one supply is at or above +2.7V. The
input voltage rails (channels) can be configured to
sequentially turn-on/off, track each other, or have com-
pletely independent operation.
The discharged filter capacitors of the circuit card provide
low impedance to the live backplane. High inrush currents
from the backplane to the circuit card can burn up connec-
tors and components, or momentarily collapse the back-
plane power supply leading to a system reset. The
MAX5927A/MAX5929A–MAX5929Dhot-swap controllers
prevent such problems by gradually ramping up the output
voltage and regulating the current to a preset limit when the
board is plugged in, allowing the system to stabilize safely.
After the startup cycle is complete, on-chip comparators
provide VariableSpeed/BiLevel™ protection against short-
circuit and overcurrent faults, and provide immunity against
system noise and load transients. The load is disconnected
in the event of a fault condition. The MAX5929C/
MAX5929D automatically restart after a fault condition,
while the MAX5929A/MAX5929B must be unlatched. The
MAX5927A fault management mode is selectable.
The MAX5927A/MAX5929A–MAX5929D offer a variety of
options to reduce external component count and design
time. All devices integrate an on-board charge pump to
drive the gates of low-cost external n-channel MOSFETs,
an adjustable startup timer, and an adjustable current
limit. The devices offer integrated features like startup
current regulation and current glitch protection to elimi-
nate external timing resistors and capacitors. The
MAX5929B/MAX5929D provide an open-drain, active-low
status output for each channel, the MAX5929A/
MAX5929C provide an open-drain, active-high status out-
put for each channel, and the MAX5927A status output
polarity is selectable.
The MAX5927A is available in a 32-pin thin QFN package
and the MAX5929A–MAX5929Dare available in a 24-pin
QSOP package. All devices are specified over the -40°C
to +85°C extended temperature range.
Applications
FeaturesSafe Hot Swap for +1V to +15V Power Supplies
with Any Input Voltage (VIN_≥2.7V)Adjustable Circuit-Breaker/Current-Limit
Threshold from 25mV to 100mVConfigurable Tracking, Sequencing, or
Independent Operation ModesVariableSpeed/BiLevel Circuit-Breaker ResponseInternal Charge Pumps Generate n-Channel
MOSFET Gate DrivesInrush Current Regulated at StartupAutoretry or Latched Fault ManagementProgrammable Undervoltage LockoutStatus Outputs Indicate Fault/Safe Condition
MAX5927A/MAX5929A–MAX5929D
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers313029282726
LIM1ON1ON2POLMODEON3ON4
LIM21112131415
STAT2
TIM
N.C.
LATCH
STAT3STAT4
BIAS
GND
GATE3
SENSE3
IN3
N.C.
LIM3
GATE2
SENSE2
STAT1
GATE4
SENSE4
IN4
LIM4
GATE1
SENSE1
MAX5927A
THIN QFN
IN124IN2
TOP VIEW
Pin Configurations
Ordering Information
19-4087; Rev 0; 5/08
PARTTEMP RANGEPIN-PACKAGE
MAX5927AETJ+-40°C to +85°C32 Thin QFN-EP*
MAX5929AEEG+-40°C to +85°C24 QSOP
MAX5929BEEG+-40°C to +85°C24 QSOP
MAX5929CEEG+-40°C to +85°C24 QSOP
MAX5929DEEG+-40°C to +85°C24 QSOP
VariableSpeed/BiLevel is a trademark of Maxim Integrated
PCI Express®Hot Plug
Hot Plug-In Daughter Cards
RAID
Power-Supply
Sequencing/Tracking
Basestation Line Cards
Portable Computer Device
Bays (Docking Stations)
Network Switches, Routers,
Hubs
Selector Guide and Typical Operating Circuit appear at end
of data sheet.
*EP = Exposed pad.
+Denotes a lead-free/RoHS-compliant package.
Pin Configurations continued at end of data sheet.
MAX5927A/MAX5929A–MAX5929D
Low-Voltage, Quad, Hot-Swap
Controllers/Power SequencersABBSSOOLLUUTTEE MMAAXXIIMMUUMM RRAATTIINNGGSS
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.)
IN_..........................................................................-0.3V to +16V
GATE_.............................................................-0.3V to (IN_ + 6V)
BIAS (Note 1) ..............................................(VIN- 0.3V) to +16V
ON_, STAT_, LIM_ (MAX5927A), TIM, MODE,
LATCH (MAX5927A), POL (MAX5927A)
(Note 1).....................................................-0.3V to (VIN+ 0.3V)
SENSE_........................................................-0.3V to (IN_ + 0.3V)
Current into Any Pin..........................................................±50mA
Continuous Power Dissipation (TA= +70°C)
24-Pin QSOP (derate 9.5mW/°C above +70°C)............762mW
32-Pin Thin QFN (derate 21.3mW/°C above +70°C)..1702mW
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
(VIN_= +1V to +15V provided at least one supply is larger than or equal to +2.7V, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at VIN1= 12.0V, VIN2= 5.0V, VIN3= 3.3V, VIN4= 1.0V, VON_= +3.3V, and TA= +25°C.) (Notes 1, 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
POWER SUPPLIES
IN_ Input Voltage RangeVIN_At least one VIN_1.015V
Supply CurrentIQIIN1 + IIN2 + IIN3 + IIN4, VON_ = 2.7V,
VIN_ = +15V, after STAT_ asserts2.55mA
CURRENT CONTROL
LIM_ = GND, MAX5927A/
MAX5929A–MAX5929D (Note 4)22.52528
RLIM_ = 10kΩ (MAX5927A)80125
Slow-Comparator Threshold
(VIN_ - VSENSE_)
(Note 3)
VSC,TH
RLIM_ from LIM_ to GND (MAX5927A)RLIM_ x 7.5 x
10-6 + 25mV
1mV overdrive3msSlow-Comparator Response Time
(Note 4)tSCD50mV overdrive130µs
Fast-Comparator Threshold
(VIN_ - VSENSE_)VFC,TH2 x
VSC,THmV
Fast-Comparator Response TimetFCD10mV overdrive, from overload condition200ns
SENSE_ Input Bias CurrentIB SENSE_VSENSE_ = VIN_0.031µA
Note 1:VINis the largest of VIN1, VIN2, VIN3, and VIN4.
MAX5927A/MAX5929A–MAX5929D
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
ELECTRICAL CHARACTERISTICS (continued)
(VIN_= +1V to +15V provided at least one supply is larger than or equal to +2.7V, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at VIN1= 12.0V, VIN2= 5.0V, VIN3= 3.3V, VIN4= 1.0V, VON_= +3.3V, and TA= +25°C.) (Notes 1, 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
MOSFET DRIVER
RTIM = 100kΩ8.010.813.6
RTIM = 4kΩ (minimum value)0.300.40.55Startup Period (Note 5)tSTART
TIM floating (default)5914
Charging, VGATE_ = GND, VIN_ = 5V
(Note 6)80100125
Discharging, during startup100
Discharging, normal turn-off or triggered by
the slow comparator after startup,
VGATE_ = 5V, VIN_ = 10V, VON_ = 0V7Average Gate CurrentIGATE
Discharging, triggered by a fault after
startup, VGATE_ = 5V, VIN_ = 10V,
(VIN_ - VSENSE_) > VFC,TH (Note 7)50120
Gate-Drive VoltageVDRIVEVGATE_ - VIN_, IGATE_ = 1µA4.95.35.6V
ON COMPARATOR
Low to high0.830.8750.90VON_ ThresholdVON_,THHysteresis25mV
ON_ Propagation Delay10mV overdrive10µs
ON_ Voltage RangeVON_Without false output inversionVINV
ON_ Input Bias CurrentIBON_VON_ = VIN0.031µA
ON_ Pulse Width LowtUNLATCHTo unlatch after a latched fault100µs
DIGITAL OUTPUTS (STAT_)
Output Leakage CurrentVSTAT_ ≤ 15V1µA
Output Voltage LowVOL_POL = unconnected (MAX5927A),
ISINK = 1mA0.4V
UNDERVOLTAGE LOCKOUT (UVLO)
UVLO ThresholdVUVLO
Startup is initiated when this threshold is
reached by any VIN_ and VON_ > 0.9V
(Note 8)
2.252.65V
UVLO HysteresisVUVLO,HYST250mV
UVLO Glitch Filter Reset TimetD, GFVIN < VUVLO maximum pulse width to reset10µs
UVLO to Startup DelaytD,UVLOTime input voltage must exceed VUVLO
before startup is initiated2037.560ms
Input Power-Ready ThresholdVPWRRDY(Note 9)0.90.951.0V
Input Power-Ready HysteresisVPWRHYST50mV
MAX5927A/MAX5929A–MAX5929D
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
ELECTRICAL CHARACTERISTICS (continued)
(VIN_= +1V to +15V provided at least one supply is larger than or equal to +2.7V, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at VIN1= 12.0V, VIN2= 5.0V, VIN3= 3.3V, VIN4= 1.0V, VON_= +3.3V, and TA= +25°C.) (Notes 1, 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
LOGIC AND TIMING
POL Input PullupIPOLPOL = GND (MAX5927A)246µA
LATCH Input PullupILATCHLATCH = GND (MAX5927A)246µA
MODE Input VoltageVMODEMODE unconnected (default to sequencing
mode)1.01.251.5V
Independent Mode Selection
ThresholdVINDEP, THVMODE rising0.4V
Tracking Mode Selection
ThresholdVTRACK, THVMODE rising2.7V
MODE Input ImpedanceRMODE200kΩ
Autoretry DelaytRETRYDelay time to restart after fault shutdown64 x
tSTARTms
Note 2:All devices are 100% tested at TA= +85°C. Limits over temperature are guaranteed by design.
Note 3:The slow-comparator threshold is adjustable. VSC,TH= RLIMx 7.5µA + 25mV (see the Typical Operating Characteristics).
Note 4:The current-limit slow-comparator response time is weighed against the amount of overcurrent—the higher the overcurrent
condition, the faster the response time (see the Typical Operating Characteristics).
Note 5:The startup period (tSTART) is the time during which the slow comparator is ignored and the device acts as a current limiter
by regulating the sense current with the fast comparator (see the Startup Periodsection).
Note 6:The current available at GATE is a function of VGATE(see the Typical Operating Characteristics).
Note 7:After a fault triggered by the fast comparator, the gate is discharged by the strong discharge current.
Note 8:Each channel input while the other inputs are at +1V.
Note 9:Each channel input while any other input is at +3.3V.
Typical Operating Characteristics
(Typical Operating Circuit, Q1 = Q2 = Q3 = Q4 = Fairchild FDB7090L, VIN1= 12V, VIN2= 5.0V, VIN3= 3.3V, VIN4= 1.0V, TA=
+25°C, unless otherwise noted. Channels 1 through 4 are identical in performance. Where characteristics are interchangeable,
channels 1 through 4 are referred to as W, X, Y, and Z.)
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX5927A toc01
VINW (V)
IIN
(mA)824101214
VINX = VINY = VINZ = 2.7V
IINW + IINX + IINY + IINZ
IINW
IINX + IINY + IINZ
TOTAL SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX5927A toc02
VIN (V)
IIN
(mA)
IIN = IIN1 + IIN2 + IIN3 + IIN4
VIN = VINW = VINX = VINY = VINZ
VON = VON1 = VON2 = VON3 = VON4
VON = 0V
VON = 3.3V
SUPPLY CURRENT
vs. TEMPERATURE
MAX5927A toc03
TEMPERATURE (°C)
IIN
(mA)-153560
VON_ = VINX = VINY = VINZ = 2.7V
VINW = 2.8V
IINW + IINX + IINY + IINZ
IINX + IINY + IINZ
IINW
MAX5927A/MAX5929A–MAX5929D
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
GATE-DRIVE VOLTAGE
vs. INPUT VOLTAGE
MAX5927A toc04
VINW (V)
DRIVEW
(V)824101214
VINX = VINY = VINZ = 2.7V
GATE CHARGE CURRENT
vs. GATE VOLTAGE
MAX5927A toc05
VGATEW (V)
GATE CHARGE CURRENT (
VONW = VINX = VINY = VINZ = 2.7V
VINW = 1V
VINW = 5V
VINW = 13.2V
GATE CHARGE CURRENT
vs. TEMPERATURE
MAX5927A toc06
TEMPERATURE (°C)
GATE CHARGE CURRENT (
VONW = VINX = VINY = VINZ = 2.7V
VGATEW = 0V
VINW = 13.2V
VINW = 5V
GATE DISCHARGE CURRENT (NORMAL)
vs. GATE VOLTAGE
MAX5927A toc07
VGATEW (V)
GATE DISCHARGE CURRENT (mA)41216
VONW = 0V
VINX = VINY = VINZ = 2.7V
VINW = 13.2V
VINW = 1V
VINW = 5V
VINW = 3.3V
GATE DISCHARGE CURRENT (NORMAL)
vs. TEMPERATURE
MAX5927A toc08
TEMPERATURE (°C)
GATE DISCHARGE CURRENT (mA)-153560
VONW = 0V
VINX = VINY = VINZ = 2.7V
VINW = 13.2V
VINW = 5V
VINW = 3.3V
VINW = 1V255075100125
TURN-OFF TIME
vs. SENSE VOLTAGE
MAX5927A toc09
VINW - VSENSEW (mV)
TURN-OFF TIME (ms)
SLOW-COMPARATOR
THRESHOLD
FAST-COMPARATOR
THRESHOLD
TURN-OFF TIME vs. SENSE VOLTAGE
(EXPANDED SCALE)
MAX5927A toc10
VINW - VSENSEW (mV)
TURN-OFF TIME (ms)
SLOW-COMPARATOR THRESHOLD
SLOW-COMPARATOR THRESHOLD
vs. RLIMW
MAX5927A toc11
RLIMW (kΩ)
SC,TH
(mV)246810
STARTUP PERIOD
vs. RTIM
MAX5927A toc12
RTIM (kΩ)
tSTART
(ms)100200400300500
Typical Operating Characteristics (continued)
(Typical Operating Circuit, Q1 = Q2 = Q3 = Q4 = Fairchild FDB7090L, VIN1= 12V, VIN2= 5.0V, VIN3= 3.3V, VIN4= 1.0V, TA=
+25°C, unless otherwise noted. Channels 1 through 4 are identical in performance. Where characteristics are interchangeable,
channels 1 through 4 are referred to as W, X, Y, and Z.)
MAX5927A/MAX5929A–MAX5929D
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
TURN-OFF TIME
SLOW-COMPARATOR FAULT
MAX5927A toc13
VSTATW
2V/div
VGATEW
5V/div
VINW - VSENSEW
25mV/div
1ms/div
TURN-OFF TIME
FAST-COMPARATOR FAULT
MAX5927A toc14VSTATW
2V/div
VGATEW
5V/div
VINW - VSENSEW
100mV/div
100ns/div
STARTUP WAVEFORMS FAST TURN-ON
(CGATE = 0nF, CBOARD = 1000μF)
MAX5927A toc15
VONW
5V/div
VGATEW
10V/div
VSTATW
5V/div
IINW
2A/div
VOUTW
10V/div
2ms/div
STARTUP WAVEFORMS SLOW TURN-ON
(CGATE = 0.22μF, CBOARD = 1000μF)
MAX5927A toc16
VONW
5V/div
VGATEW
10V/div
VSTATW
5V/div
IINW
2A/div
VOUTW
10V/div
10ms/div
AUTORETRY DELAY (TIME FLOATING)
MAX5927A toc17
VGATEW
2V/div
VOUTW
2V/div
IOUTW
500mA/div
100ms/div
TURN-ON IN
VOLTAGE-TRACKING MODE
MAX5927A toc18
VINW
2V/div
VONW
2V/div
5V/div
4ms/div
VPWRRDY
VGATEX
VGATEW
Typical Operating Characteristics (continued)
(Typical Operating Circuit, Q1 = Q2 = Q3 = Q4 = Fairchild FDB7090L, VIN1= 12V, VIN2= 5.0V, VIN3= 3.3V, VIN4= 1.0V, TA=
+25°C, unless otherwise noted. Channels 1 through 4 are identical in performance. Where characteristics are interchangeable,
channels 1 through 4 are referred to as W, X, Y, and Z.)
XXXX
MAX5927A toc19
VINW
2V/div
VONW
2V/div
5V/div
4ms/div
VGATEX
VGATEW
VPWRRDY
TURN-OFF IN
VOLTAGE-TRACKING MODEXXXX
MAX5927A toc20
VINW
2V/div
VONW
2V/div
5V/div
4ms/div
VGATEX
VGATEW
TURN-ON IN
POWER-SEQUENCING MODE
VPWRRDY
XXXX
MAX5927A toc21
VINW
2V/div
VONW
2V/div
5V/div
4ms/div
VGATEX
VGATEW
TURN-OFF IN
POWER-SEQUENCING MODE
VPWRRDY
MAX5927A/MAX5929A–MAX5929D
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
XXXX
MAX5927A toc22
VINW
2V/div
VONW
2V/div
5V/div
4ms/div
TURN-ON IN
INDEPENDENT MODE
VGATEX
VGATEW
XXXX
MAX5927A toc23
VINW
2V/div
VONW
2V/div
5V/div
4ms/div
TURN-OFF IN
INDEPENDENT MODE
VPWRRDY
VGATEX
VGATEW
STRONG GATE DISCHARGE CURRENT
vs. OVERDRIVE
MAX5927A toc24
GATE DISCHARGE CURRENT (mA)352530454050
VINW = 5V
VINW = 2.7V
VONW = VIN
VGATE = 5V
AFTER STARTUP
VINW = 12Vypical Operating Characteristics (continued)
(Typical Operating Circuit, Q1 = Q2 = Q3 = Q4 = Fairchild FDB7090L, VIN1= 12V, VIN2= 5.0V, VIN3= 3.3V, VIN4= 1.0V, TA=
+25°C, unless otherwise noted. Channels 1 through 4 are identical in performance. Where characteristics are interchangeable,
channels 1 through 4 are referred to as W, X, Y, and Z.)
MAX5927A/MAX5929A–MAX5929D
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
Pin Description
PIN
MAX5927AMAX5929A–
MAX5929D
NAMEFUNCTION4IN1Channel 1 Supply Input. Connect to a supply voltage from 1V to 15V and to one end of
RSENSE1. Bypass with a 0.1µF capacitor to ground.5SENSE1Channel 1 Current-Sense Input. Connect SENSE1 to the drain of an external MOSFET
and to one end of RSENSE1.6GATE1Channel 1 Gate-Drive Output. Connect to gate of external n-channel MOSFET.—LIM4Channel 4 Current-Limit Setting. Connect a resistor from LIM4 to GND to set current-trip
level. Connect to GND for the default 25mV threshold. Do not leave unconnected.7IN4Channel 4 Supply Input. Connect to a supply voltage from 1V to 15V and to one end of
RSENSE4. Bypass with a 0.1µF capacitor to ground.8SENSE4Channel 4 Current-Sense Input. Connect SENSE4 to the drain of an external MOSFET
and to one end of RSENSE4.9GATE4Channel 4 Gate-Drive Output. Connect to gate of external n-channel MOSFET.10STAT1
Open-Drain Status Signal for Channel 1. STAT1 asserts when hot swap is successful and
tSTART has elapsed. STAT1 deasserts if ON1 is low, or if channel 1 is turned off for any
fault condition.11STAT2
Open-Drain Status Signal for Channel 2. STAT2 asserts when hot swap is successful and
tSTART has elapsed. STAT2 deasserts if ON2 is low, or if channel 2 is turned off for any
fault condition.12TIM
Startup Timer Setting. Connect a resistor from TIM to GND to set the startup period.
Leave TIM unconnected for the default startup period of 9ms. RTIM must be between
4kΩ and 500kΩ.
11, 20—N.C.No Connection. Not internally connected.—LATCHLatch/Autoretry Selection Input. Connect LATCH to GND for autoretry mode after a fault.
Leave LATCH unconnected for latch mode.13STAT3
Open-Drain Status Signal for Channel 3. STAT3 asserts when hot swap is successful and
tSTART has elapsed. STAT3 deasserts if ON3 is low, or if channel 3 is turned off for any
fault condition.14STAT4
Open-Drain Status Signal for Channel 4. STAT4 asserts when hot swap is successful and
tSTART has elapsed. STAT4 deasserts if ON4 is low, or if channel 4 is turned off for any
fault condition.15BIAS
Supply Reference Output. The highest supply is available at BIAS for filtering. Connect a
1nF to 10nF ceramic capacitor from BIAS to GND. No other connections are allowed to
this pin.16GNDGround17GATE3Channel 3 Gate-Drive Output. Connect to gate of external n-channel MOSFET.18SENSE3Channel 3 Current-Sense Input. Connect SENSE3 to the drain of an external MOSFET
and to one end of RSENSE3.19IN3Channel 3 Supply Input. Connect to a supply voltage from 1V to 15V and to one end of
RSENSE3.—LIM3Channel 3 Current-Limit Setting. Connect a resistor from LIM3 to GND to set current-trip
level. Connect to GND for the default 25mV threshold. Do not leave unconnected.
Detailed Description
The MAX5927A/MAX5929A–MAX5929D are circuit-
breaker ICs for hot-swap applications where a line card
is inserted into a live backplane. The MAX5927A/
MAX5929A–MAX5929D operate down to 1V provided
one of the inputs is at or ≥2.7V. Normally, when a line
card is plugged into a live backplane, the card’s dis-
charged filter capacitors provide low impedance that
can momentarily cause the main power supply to col-
lapse. MAX5927A/MAX5929A–MAX5929D reside either
on the backplane or on the removable card to provide
inrush current limiting and short-circuit protection. This is
achieved by using external n-channel MOSFETs, exter-
nal current-sense resistors, and on-chip comparators.
The startup period and current-limit threshold of the
MAX5927A/MAX5929A–MAX5929D can be adjusted
with external resistors. Figure 1 shows the MAX5927A/
MAX5929A–MAX5929D functional diagram.
The MAX5927A offers four programmable current limits,
selectable fault management mode, and selectable
STAT_ output polarity. The MAX5929A–MAX5929D fea-
ture fixed current limits, and a variety of fault manage-
ment and STAT_ polarity option combinations.
Mode
The MAX5927A/MAX5929A–MAX5929Dsupport three
modes of operation: voltage tracking, power sequenc-
ing, and independent. Select the appropriate mode
according to Table 1.
Voltage-Tracking Mode
Connect MODE high to enter voltage-tracking mode.
While in voltage-tracking mode, all channels turn on
and off together. To turn all channels on:At least one VIN_must exceed VUVLO(2.45V) for the
UVLO to startup delay (37.5ms).All VIN_must exceed VPWRRDY(0.95V).All VON_must exceed VON,TH(0.875V).No faults may be present on any channel.
MAX5927A/MAX5929A–MAX5929D
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
MODEOPERATION
High (connect to BIAS)Voltage tracking
UnconnectedPower sequencing
GNDIndependent
Table 1. Operational Mode Selection
PIN
MAX5927AMAX5929A–
MAX5929D
NAMEFUNCTION20GATE2Channel 2 Gate-Drive Output. Connect to gate of external n-channel MOSFET.21SENSE2Channel 2 Current-Sense Input. Connect SENSE2 to the drain of an external MOSFET
and to one end of RSENSE2.22IN2Channel 2 Supply Input. Connect to a supply voltage from 1V to 15V and to one end of
RSENSE2.—LIM2Channel 2 Current-Limit Setting. Connect a resistor from LIM2 to GND to set the current-
trip level. Connect to GND for the default 25mV threshold. Do not leave unconnected.23ON4On/Off Channel 4 Control Input. See the Mode section.24ON3On/Off Channel 3 Control Input. See the Mode section.1MODEMode Configuration Input. Mode is configured according to Table 1 as soon as one of
the IN_ voltages exceeds UVLO and before turning on OUT_. See the Mode section.—POLSTAT Output Polarity Select. See Table 3 and the Status Output section.2ON2On/Off Channel 2 Control Input. See the Mode section.3ON1On/Off Channel 1 Control Input. See the Mode section.—LIM1Channel 1 Current-Limit Setting. Connect a resistor from LIM1 to GND to set the current-
trip level. Connect to GND for the default 25mV threshold. Do not leave unconnected.—EPExposed Pad. EP is internally connected to GND. Leave EP unconnected or connect to
GND.
Pin Description (continued)
MAX5927A/MAX5929A–MAX5929D
The MAX5927A/MAX5929A–MAX5929Dturn off all
channels if any of the above conditions are not met.
After a fault-latched shutdown, cycle any of the ON_
inputs to unlatch and restart all channels.
Power-Sequencing Mode
Leave MODE floating to enter power-sequencing
mode. While in power-sequencing mode, the
MAX5927A/MAX5929A–MAX5929D turn on and off
each channel depending on the state of the corre-
sponding VON_. To turn on a given channel:At least one VIN_must exceed VUVLO(2.45V) for the
UVLO to startup delay (37.5ms).All VIN_must exceed VPWRRDY(0.95V).The corresponding VON_must exceed VON,TH
(0.875V).No faults can be present on any channel.
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
FAST COMP.
SLOW COMP.
FAST DISCHARGE
OUT1
2.45VBIAS AND
REFERENCES
STARTUP
OSCILLATOR
TIMING
OSCILLATOR
CHARGE
PUMPDEVICE CONTROL
LOGIC
VSC, THVFC, TH
RLIM1
SENSE1
IN1
GATE1
RSENSE1
LIM1*
RTIM
TIM
1nF
BIASPOL*
RLIM2
100μA
UVLO
UVLOFAST COMP.
SLOW COMP.
FAST DISCHARGE
SLOW DISCHARGESLOW DISCHARGE
OUT2
CHARGE
PUMP
CURRENT CONTROL
AND
STARTUP LOGIC
CURRENT CONTROL
AND
STARTUP LOGIC
VSC, THVFS, TH
SENSE2
IN2
GATE2
RSENSE2
LIM2*
100μA
STAT2STAT1
LIM3*LIM4*
FAST COMP.
SLOW COMP.
FAST DISCHARGE
OUT3
FAULT
MANAGEMENT
OPERATION
MODE
CHARGE
PUMP
INPUT
CONPARATORS
VSC, THVFS, TH
SENSE3
IN3
GATE3
RSENSE3
RLIM3RLIM4
100μA
UVLOUVLO
FAST COMP.
SLOW COMP.
FAST DISCHARGE
SLOW DISCHARGESLOW DISCHARGE
OUT4
CHARGE
PUMP
CURRENT CONTROL
AND
STARTUP LOGIC
CURRENT CONTROL
AND
STARTUP LOGIC
VSC, THVFS, TH
SENSE4
IN4
GATE4
RSENSE4
100μA
3mA/
50mA
3mA/
50mA
3mA/
50mA
3mA/
50mA
STAT4STAT3*MAX5927A ONLY.LATCH*MODEON1ON2ON3ON4
MAX5927A/
MAX5929A–
MAX5929D
Figure 1. Functional Diagram
MAX5927A/MAX5929A–MAX5929D
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
ON1
ON2
ON3
ON4
ANY
IN_
IN2
IN3
IN4
OUT1*
OUT2*
OUT3*
OUT4*
VUVLO (2.45V)
VPWRRDY (0.95V)
VPWRRDY (0.95V)
VPWRRDY (0.95V)
VPWRRDY (0.95V)
*THE OUT_ DISCHARGE RATE IS A RESULT OF NATURAL DECAY OF THE LOAD RESISTANCE AND CAPACITANCE.
Figure 2. Voltage-Tracking Timing Diagram (Provided tD, UVLORequirement is Met)
MAX5927A/MAX5929A–MAX5929D
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
ON1
ON2
ON3
ON4
ANY
IN_
IN2
IN3
IN4
OUT1
OUT2
OUT3
OUT4
VUVLO (2.45V)
VPWRRDY (0.95V)
VPWRRDY (0.95V)
VPWRRDY (0.95V)
VPWRRDY (0.95V)
*THE OUT_ DISCHARGE RATE IS A RESULT OF NATURAL DECAY OF THE LOAD RESISTANCE AND CAPACITANCE.
Figure 3. Power-Sequencing Timing Diagram (Provided tD, UVLORequirement is Met)

Partno	Mfg	Dc	Qty	Available	Descript
MAX5929AEEG+ \|MAX5929AEEG	MAX	N/a	13	avai	Low-Voltage, Quad, Hot-Swap Controllers/Power Sequencers