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), ..
MAX5933BESA+ ,Positive High-Voltage, Hot-Swap ControllersApplications*Insert the desired suffix from the Selector Guide into the blankHot Board Insertionto ..
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 ..
MAZ8120-H ,Silicon planar typeFeatures•Extremely low noise voltage caused from the diode (2.4V to 39V,1/3 to 1/10 of our conventi ..
MAX5929LHEEG
Low-Voltage, Quad, Hot-Swap Controllers/Power Sequencers
General DescriptionThe MAX5927/MAX5929 +1V to +13.2V quad hot-swap
controllers provide complete protection for multisupply
systems. They allow the safe insertion and removal of cir-
cuit cards into live backplanes. These devices hot swap
multiple supplies ranging from +1V to +13.2V, provided
one supply is at or above +2.7V and only one supply is
above +11.0V. The input voltage rails (channels) can be
configured to sequentially turn-on/off, track each other,
or have completely independent operation.
The discharged filter capacitors of the circuit card pro-
vide low impedance to the live backplane. High inrush
currents from the backplane to the circuit card can burn
up connectors and components, or momentarily collapse
the backplane power supply leading to a system reset.
The MAX5927/MAX5929 hot-swap controllers prevent
such problems by gradually ramping up the output volt-
age 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 com-
parators 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
MAX5929A automatically restarts after a fault condition,
while the MAX5929L must be unlatched. The MAX5927
fault management mode is selectable.
The MAX5927/MAX5929 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 cur-
rent regulation and current glitch protection to eliminate
external timing resistors and capacitors. The
MAX5929_L provides an open-drain active-low status
output for each channel, the MAX5929_H provides an
open-drain active-high status output for each channel,
and the MAX5927 status output polarity is selectable.
The MAX5927 is available in a 32-pin thin QFN package
and the MAX5929 is available in a 24-pin QSOP pack-
age. All devices are specified over the extended tem-
perature range, -40°C to +85°C.
Applications
FeaturesSafe Hot Swap for +1V to +13.2V Power Supplies
with Any Input Voltage (VIN_≥2.7V and Only One
VIN_> 11.0V)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
MAX5927/MAX5929
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
Pin Configurations
Ordering InformationVariableSpeed/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 paddle.
MAX5927/MAX5929
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
ABSOLUTE MAXIMUM RATINGSStresses 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 +14V
GATE_.............................................................-0.3V to (IN_ + 6V)
BIAS (Note 1) ..............................................(VIN- 0.3V) to +14V
ON_, STAT_, LIM_ (MAX5927), TIM, MODE,
LATCH (MAX5927), POL (MAX5927)
(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 +13.2V provided at least one supply is larger than or equal to +2.7V and only one supply is > +11.0V, 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
Note 1:VINis the largest of VIN1, VIN2, VIN3, and VIN4.
MAX5927/MAX5929
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
ELECTRICAL CHARACTERISTICS (continued)(VIN_= +1V to +13.2V provided at least one supply is larger than or equal to +2.7V and only one supply is > +11.0V, 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
MAX5927/MAX5929
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
ELECTRICAL CHARACTERISTICS (continued)(VIN_= +1V to +13.2V provided at least one supply is larger than or equal to +2.7V and only one supply is > +11.0V, 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 = +25°C.) (Notes 1, 2)
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 +2.7V.
Typical Operating Characteristics(Typical Operating Circuits, 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.)
MAX5927/MAX5929
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
Typical Operating Characteristics (continued)(Typical Operating Circuits, 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.)
MAX5927/MAX5929
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
Typical Operating Characteristics (continued)(Typical Operating Circuits, 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.)
MAX5927/MAX5929
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
Typical Operating Characteristics (continued)(Typical Operating Circuits, 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.)
MAX5927/MAX5929
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
Detailed DescriptionThe MAX5927/MAX5929 are circuit-breaker ICs for hot-
swap applications where a line card is inserted into a
live backplane. The MAX5927/MAX5929 operate down
to 1V provided one of the inputs is above 2.7V.
Normally, when a line card is plugged in to a live back-
plane, the card’s discharged filter capacitors provide
low impedance that can momentarily cause the main
power supply to collapse. The MAX5927/MAX5929
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-chan-
nel MOSFETs, external current-sense resistors, and on-
chip comparators. The startup period and current-limit
threshold of the MAX5927/MAX5929 can be adjusted
with external resistors. Figure 1 shows the MAX5927/
MAX5929 functional diagram.
The MAX5927 offers four programmable current limits,
selectable fault management mode, and selectable
STAT_ output polarity. The MAX5929 features fixed cur-
rent limits, and a variety of fault management and
STAT_ polarity option combinations.
ModeThe MAX5927/MAX5929 supports three modes of oper-
ation: voltage-tracking, power-sequencing, and inde-
pendent mode. Select the appropriate mode according
to Table 1.
Voltage-Tracking ModeConnect 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.
MAX5927/MAX5929
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
MAX5927/MAX5929The MAX5927/MAX5929 turn 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 ModeLeave MODE floating to enter power-sequencing
mode. While in power-sequencing mode, the
MAX5927/MAX5929 turn on and off each channel
depending on the state of the corresponding 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 may be present on any channel.
Low-Voltage, Quad, Hot-Swap
Controllers/Power SequencersFigure 1. Functional Diagram
MAX5927/MAX5929
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
MAX5927/MAX5929
Low-Voltage, Quad, Hot-Swap
Controllers/Power SequencersFigure 3. Power-Sequencing Timing Diagram (Provided tD, UVLORequirement is Met)
The MAX5927/MAX5929 turn 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, depending on the corresponding
VON_state.
Independent ModeConnect MODE to GND to enter independent mode.
While in independent mode, the MAX5927/MAX5929
provide complete independent control for each chan-
nel. To turn on a given channel:At least one VIN_must exceed VUVLO(2.45V) for the
UVLO to startup delay (37.5ms)The corresponding VIN_must exceed VPWRRDY
(0.95V)The corresponding VON_must exceed VON,TH
The MAX5927/MAX5929 turn off the corresponding
channel if any of the above conditions are not met.
During a fault condition on a given channel only, the
affected channel is disabled. After a fault-latched shut-
down, recycle the corresponding ON_ inputs to unlatch
and restart only the corresponding channel.
Startup PeriodRTIMsets the duration of the startup period from 0.4ms
(RTIM= 4kΩ) to 50ms (RTIM= 500kΩ) (see the Setting
the Startup Period, RTIMsection). The default startup
period is fixed at 9ms when TIM is floating. The startup
period begins after the turn-on conditions are met as
described in the Modesection, and the device is not
latched or in its autoretry delay (see the Latched and
Autoretry Fault Managementsection).
The MAX5927/MAX5929 limit the load current if an
overcurrent fault occurs during startup instead of com-
pletely turning off the external MOSFETs. The slow
comparator is disabled during the startup period and
the load current can be limited in two ways:Slowly enhancing the MOSFETs by limiting the
MOSFET gate-charging current.Limiting the voltage across the external current-
sense resistor.
During the startup period, the gate-drive current is limit-
ed to 100µA and decreases with the increase of the
gate voltage (see the Typical Operating Characteristics).
This allows the controller to slowly enhance the
MOSFETs. If the fast comparator detects an overcur-
rent, the MAX5927/MAX5929 regulate the gate voltage
to ensure that the voltage across the sense resistor
does not exceed VSU,TH. This effectively regulates the
inrush current during startup.
Figure 6 shows the startup waveforms. STAT_ is assert-
ed immediately after the startup period if no fault condi-
tion is present.
VariableSpeed/BiLevel Fault ProtectionVariableSpeed/BiLevel fault protection incorporates
comparators with different thresholds and response
times to monitor the load current (Figure 7). During the
startup period, protection is provided by limiting the
load current. Protection is provided in normal operation
(after the startup period has expired) by discharging
the MOSFET gates with a 3mA/50mA pulldown current
in response to a fault condition. After a fault, STAT_ is
deasserted, the MAX5929L stays latched off and the
MAX5929A automatically restart. Use the MAX5927
LATCH input to control whether the STAT_ outputs latch
off or Autoretry after a fault condition (see the Latched
and Autoretry Fault Managementsection).
MAX5927/MAX5929
Low-Voltage, Quad, Hot-Swap
Controllers/Power Sequencers
