MAX5902ACEUT ,+72V SOT23/TDFN Simple Swapper Hot-Swap ControllersELECTRICAL CHARACTERISTICS(V = +9V to +72V, GND = 0V, ON/OFF open circuit, T = -40°C to +85°C, unle ..
MAX5902LAETT+ ,+72V SOT23/TDFN Simple Swapper Hot-Swap ControllersFeaturesThe MAX5902/MAX5903 are hot-swap controllers that♦ Wide +9V to +72V Operation allow a circu ..
MAX5902LAEUT ,+72V SOT23/TDFN Simple Swapper Hot-Swap ControllersMAX5902/MAX590319-1988; Rev 3; 1/07+72V, SOT23/TDFN, Simple Swapper Hot-SwapControllers
MAX5903AAETT+ ,+72V SOT23/TDFN Simple Swapper Hot-Swap ControllersApplications*For specific part numbers see the Selector Guide at end ofNetwork Routers Serversdata ..
MAX5903AAEUT+T ,+72V SOT23/TDFN Simple Swapper Hot-Swap ControllersELECTRICAL CHARACTERISTICS(V = +9V to +72V, GND = 0V, ON/OFF open circuit, T = -40°C to +85°C, unle ..
MAX5903LBETT+ ,+72V SOT23/TDFN Simple Swapper Hot-Swap ControllersMAX5902/MAX590319-1988; Rev 3; 1/07+72V, SOT23/TDFN, Simple Swapper Hot-SwapControllers
MAZ8062-H ,Silicon planar typeelectrical characteristicsZ Zwithin part numbersReverse current I V ··············· Specified value ..
MAZ8062-L ,Silicon planar typeFeatures•Extremely low noise voltage caused from the diode (2.4V to 39V,1/3 to 1/10 of our conventi ..
MAZ8062-M ,Silicon planar typeZener DiodesMAZ8000 SeriesSilicon planar typeUnit : mmFor stabilization of power supplyKA
MAZ8062-M ,Silicon planar typeElectrical characteristics within part numbers T = 25°CaTemperaturecoefficient ofZener voltage Rev ..
MAZ8068G ,Silicon planar typeelectrical characteristics WZ Zwithin part numbersReverse current I V Specified valuemAR R2*Tempera ..
MAZ8068GML , MAZ8xxxG Series Silicon planar type
MAX5902AAETT+-MAX5902AAETT+T-MAX5902AAEUT-MAX5902ACEUT-MAX5902LAETT+-MAX5902LAEUT-MAX5903AAETT+-MAX5903AAEUT+T-MAX5903LBETT+-MAX5903LBEUT-MAX5903LBEUT+T-MAX5903NNETT+-MAX5903NNETT+T-MAX5903NNEUT
+72V SOT23/TDFN Simple Swapper Hot-Swap Controllers
MAX5902/MAX5903
+72V, SOT23/TDFN, Simple Swapper Hot-Swap
Controllers19-1988; Rev 3; 1/07
General DescriptionThe MAX5902/MAX5903 are hot-swap controllers that
allow a circuit card to be safely hot plugged into a live
backplane without causing a glitch on the power-sup-
ply rail. These devices operate from +9V to +72V and
provide the simplest hot-swap solution by eliminating all
external components except the external p-channel
MOSFET.
The MAX5902/MAX5903 limit the inrush current to the
load and provide a circuit-breaker function for overcurrent
protection. During startup the circuit-breaker function is
disabled and the MAX5902/MAX5903 limit the inrush cur-
rent by gradually turning on the external MOSFET. Once
the external MOSFET is fully enhanced, the circuit-break-
er function is enabled and the MAX5902/MAX5903 pro-
vide overcurrent protection by monitoring the voltage
drop across the external MOSFET’s on-resistance.
The MAX5902/MAX5903 include an undervoltage lock-
out (UVLO) function, ON/OFFcontrol input, and a
power-good status output, PGOOD(MAX5902) or
PGOOD (MAX5903). A built-in thermal shutdown fea-
ture is also included to protect the external MOSFET in
case of overheating.
The MAX5902/MAX5903 offer latched or autoretry fault
management and are available with 300mV, 400mV or
500mV circuit-breaker thresholds. Both the MAX5902 and
MAX5903 are available in small SOT23 and TDFN pack-
ages, and are specified for the extended -40°C to +85°C
temperature range. For specific ordering information, see
the Selector Guideat the end of the data sheet.
ApplicationsNetwork RoutersServers
Network SwitchesRAID
Base Station LineIndustrial Systems
Cards
FeaturesWide +9V to +72V Operation Requires No External Sense Resistor Drives External p-Channel MOSFET Limits Inrush CurrentCircuit-Breaker FunctionLess than 2mA Quiescent CurrentON/OFFInput Permits Load Power-Supply
Control and SequencingAdjustable Undervoltage LockoutPower-Good Output with +72V RatingLatching or Automatic Retry Fault ManagementThermal Shutdown Helps Protect the External
MOSFET Available in Two Small Packages
6-Pin TDFN and SOT23
Ordering Information
PARTTEMP RANGEPIN-
PACKAGE
PKG
CODE
MAX5902_ _EUT-T+*-40°C to +85°C6 SOT23-6U6F+6
MAX5902_ _ETT-T+*-40°C to +85°C6 TDFN-6T633+2
MAX5903_ _EUT-T+*-40°C to +85°C6 SOT23-6U6F+6
MAX5903_ _ETT-T+*-40°C to +85°C6 TDFN-6T633+2
*For specific part numbers see the Selector Guide at end of
data sheet.
+Denotes lead-free package.
GNDON/OFFPGOOD (PGOOD)
MAX5902
MAX5903
SOT23-6TOP VIEW
( ) ARE FOR MAX5903 ONLY.
DRAIN
GATE
Pin Configurationsypical Operating CircuitsGND
ON/OFF
HOT-SWAP CONTROLLER
GND
50W ISOLATED
POWER SUPPLY
VIN (-)
ON/OFF
LUCENT
JW050A1
VIN (+)
GATE
DRAIN
PGOOD
+48V
BACKPLANECIRCUIT CARD
IRFR5410
MAX5902
Simple Swapper is a trademark of Maxim Integrated Products, Inc.Pin Configurations continued at end of data sheet.
Typical Operating Circuits continued at end of data sheet.
MAX5902/MAX5903
+72V, SOT23/TDFN, Simple Swapper Hot-Swap
Controllers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VS= +9V to +72V, GND = 0V, ON/OFFopen circuit, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VS= +48V
and TA= +25°C.) (Notes 1, 2)
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.
Terminal Voltage (with respect to GND unless otherwise noted)
VS, DRAIN, PGOOD, PGOOD................................-0.3V to +76V
ON/OFF....................................................................-0.3V to +4V
GATE to VS............................................................-12V to +0.3V
Current into any Pin............................................................±3mA
Continuous Power Dissipation (TA= +70°C)
6-Pin SOT23 (derate 9.1mW/°C above +70°C)..........727mW
6-Pin TDFN (derate 18.2mW/°C above +70°C).......1454mW
Junction to Case
Thermal Resistance, θJC(TDFN)..............................8.5°C/W
Maximum Junction Temperature.....................................+150°C
Storage Temperature Range.............................-60°C to +150°C
PARAMETERSYM B O L C O ND IT IO N SM INT YPM A XU N IT SSupply VoltageVS972V
Supply CurrentIGNDM easur ed out of G N D , P GO O D or PGOOD
op en ci r cui t, D RAIN = V S 12mA
VS = +36V to +72V91011External Gate DriveVGSVS - VGATEVS = +9V88.5V
VS = +36V to +72V5918Load Voltage Slew-Rate
MagnitudeSR| dVDRAIN/dt |
CL = 10µFVS = +9V3611V/ms
Default Undervoltage LockoutVUVLOVS increasing28.531.534.5V
Undervoltage Lockout
Hysteresis3.5V
ON/OFF Pin Input ResistanceRON/OFF193252kΩ
DRAIN to GND ResistanceRDGND900kΩ
DRAIN to VS ResistanceRDS650kΩ
ON/OFF Reference ThresholdVON/OFFVON/OFF Increasing1.141.261.38V
ON/OFF Hysteresis140mV
Start Delay (Note 3)tON80150280ms
ON/OFF Off Delay (Note 4)tOFFVS - VGATE < 1V51018ms
MAX590_ _AEUT200300460
MAX590_ _BEUT280400540Circuit-Breaker ThresholdVCBVS - VDRAIN
MAX590_ _CEUT400500660
CGATE = 1nF26.5
CGATE = 4.7nF411Circuit-Breaker Delay (Note 5)tCB
(VS - VDRAIN) > VCB
until (VS - VGATE)
< 1V, 200mV
overdrive stepCGATE = 10nF717
Restart Delay (Note 3)tRSAfter circuit breaker event,
MAX590_ A_EUT only80150280msow er - G ood O utp ut Low V ol tag eVOLIOL = 1mA0.30.6V
MAX5902/MAX5903
+72V, SOT23/TDFN, Simple Swapper Hot-Swap
Controllers
Note 1:All currents into device pins are positive, all currents out of device pins are negative, and all voltages are referenced to
GND, unless otherwise noted.
Note 2:All specifications are 100% tested at TA= +25°C, unless otherwise noted. Specifications over -40°C to +85°C are guaran-
teed by characterization.
Note 3:This is the delay time from a valid on condition until VGSbegins rising. Valid on conditions are: the device is not in undervolt-
age lockout; ON/OFFis not driven low; and the device is not in thermal shutdown.
Note 4:This is the delay from a valid low on ON/OFFuntil VGSfalls. Pulses on ON/OFFless than tOFFare ignored, offering glitch
immunity.
Note 5:Guaranteed by characterization, not production tested. CGATEis a capacitor from GATE to VS.
ELECTRICAL CHARACTERISTICS (continued)(VS= +9V to +72V, GND = 0V, ON/OFFopen circuit, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VS= +48V
and TA= +25°C.) (Notes 1, 2)
PARAMETERSYM B O L C O ND IT IO N SM INT YPM A XU N IT SPower-Good Output Open-Drain
Leakage CurrentIOHV PGOOD = 72V (MAX5902)
V PGOOD = 72V (MAX5903)10µA
Thermal Shutdown TemperatureTSDJunction temperature+125°C
Thermal Shutdown HysteresisTHY15°C
Typical Operating Characteristics(VS= +48V, GND = 0V, and TA= +25°C, unless otherwise noted. See Figure 2 for test circuits.)
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX5902 toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
SUPPLY CURRENT
vs. TEMPERATURE
MAX5902 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
VIN = +70V
VIN = +48V
VIN = +12V
VUVLO THRESHOLD
vs. TEMPERATURE
MAX5902 toc03
TEMPERATURE (°C)
LOCKOUT VOLTAGE (V)
INCREASING VIN
DECREASING VIN
Typical Operating Characteristics (continued)(VS= +48V, GND = 0V, and TA= +25°C, unless otherwise noted. See Figure 2 for test circuits.)
MAX5902/MAX5903
+72V, SOT23/TDFN, Simple Swapper Hot-Swap
ControllersGATE DRIVE VOLTAGE
vs. INPUT VOLTAGE
MAX5902 toc04
INPUT VOLTAGE (V)
GATE DRIVE (V)
RETRY TIMEOUT
vs. TEMPERATURE
MAX5902 toc05
TEMPERATURE (°C)
TIMEOUT PERIOD (ms)
t = 20ms/div
TURN-ON WAVEFORMS
RL = 60Ω, CL = 100µFA : VOUT, 50V/div
B : IIN, 1A/div
C : VGATE, 50V/div
D : VIN, 50V/div
MAX5902 toc06
t = 2ms/div
TURN-ON WAVEFORMS
RL = OPEN, CL = 100µFA : VOUT, 50V/div
B : IIN, 1A/div
C : VGATE, 20V/div
MAX5902 toc07
t = 1µs/div
CIRCUIT-BREAKER EVENT
VOVERDRIVE = 20mV, CGATE = 1000pFMAX5902 toc10
A : VDS, 0.5V/div
B : VGS, 10V/div
C : VPGOOD TO VS, 50V/div
t = 2ms/div
TURN-ON WAVEFORMS
RL = 60Ω, CL = 10µFA : VOUT, 50V/div
B : IIN, 0.5A/div
C : VGATE, 20V/div
MAX5902 toc08
t = 1µs/div
CIRCUIT-BREAKER EVENT
VOVERDRIVE = 200mV, CGATE = 1000pFMAX5902 toc11
A : VDS, 0.5V/div
B : VGS, 10V/div
C : VPGOOD TO VS, 50V/div
t = 2ms/div
TURN-ON WAVEFORMS
RL = 60Ω, CL = 100µFA : VOUT, 50V/div
B : IIN, 1A/div
C : VGATE, 20V/div
MAX5902 toc09
MAX5902/MAX5903
+72V, SOT23/TDFN, Simple Swapper Hot-Swap
Controllers
Detailed DescriptionThe MAX5902/MAX5903 are integrated hot-swap con-
troller ICs contained in 6-pin SOT23 and TDFN pack-
ages. They allow a board to be safely hot-plugged into
a live backplane without causing a glitch on the power-
supply rail. They are well suited for +48V power sys-
tems allowing cost-effective, simple, and compact
design. The MAX5902/MAX5903 operate from +9V to
+72V to cover a wide range of end equipment hot-swap
needs. They require only an external p-channel power
MOSFET to provide hot-swap control. Figure 1 shows a
functional block diagram of the MAX5902/MAX5903.
The MAX5902/MAX5903 controls an external p-channel
power MOSFET placed in the positive power-supply
pathway. When power is first applied, the MAX5902/
MAX5903 keep the MOSFET turned off. The
MAX5902/MAX5903 hold the MOSFET off indefinitely if
ON/OFFis held low, if the supply voltage is below the
undervoltage lockout level, or if the die temperature
exceeds +125°C. If none of these conditions exist for
150ms (typ), the MAX5902/MAX5903 begin to gradually
turn on the MOSFET. During this turn-on phase, the
MAX5902/MAX5903 slowly enhance the MOSFET,
allowing the voltage on the load, i.e. the drain of the
MOSFET, to rise at a rate of 9V/ms (typ). The inrush cur-
rent to the load is thus limited to a level proportional to
the load capacitance, and the constant slew rate. After
the MOSFET is fully enhanced, and the load voltage is
settled to its final value, the MAX5902A/ MAX5903A and
MAX5902L/MAX5903L monitor the voltage drop across
the MOSFET. If the voltage drop exceeds the circuit-
breaker threshold the MAX5902A/MAX5903A and
ON/OFF
GND
GNDGND
MAX5902
MAX5903
828kΩ
*900kΩ
34.5kΩ
1kΩ
GATEDRAIN
CONTROL
LOGIC
PGOOD
(PGOOD)
( ) ARE FOR THE MAX5903 ONLY
* RELATIVE TOLERANCE ±1%, ABSOLUTE TOLERANCE ±50% (TYP)
*650kΩ
Figure 1. Functional Block Diagram
Pin Description
PIN
MAX5902MAX5903
NAMEFUNCTIONVSPositive Supply Voltage Input and External p-Channel MOSFET Source Connection2DRAIN
Drain Sense Input for External p-Channel MOSFET. Connect DRAIN as close as
possible to the MOSFET’s drain and use wide circuit traces to assure good thermal
coupling between the MAX5902/MAX5903 and the MOSFET. See Layout Guidelines
Section.3GATEGate Drive Output for External p-Channel MOSFET4GNDGround ConnectionPGOODPower-Good Output. PGOOD is an n-channel, open-drain, active-low output,
referenced to GND.5PGOODPower-Good Output. PGOOD is an n-channel, open-drain, active-high output,
referenced to GND.6ON/OFF
ON/OFF Control Input. ON/OFF is referenced to GND. Drive ON/OFF above 1.38V or
leave unconnected to enable the device. Drive ON/OFF below 1V to disable the device.
ON/OFF is also used to adjust the UVLO threshold. Internally clamped to nominally 3V
through a 1kΩ resistor (See Figure 1). (See the Undervoltage Lockout section in the
Applications Information.)—EPExposed Pad (TDFN only). Connect to GND.
MAX5902/MAX5903
+72V, SOT23/TDFN, Simple Swapper Hot-Swap
ControllersMAX5902L/MAX5903L turn off the MOSFET, discon-
necting the load immediately. If no circuit-breaker fault
exists, the MAX5902/MAX5903 assert the power-good
output. Then, if any of four conditions exist, the power-
good output deasserts and the MAX5902/MAX5903
turn off the MOSFET. The four conditions are: the volt-
age across the MOSFET exceeds the circuit-breaker
threshold; the supply voltage falls below the undervolt-
age lockout level; the die temperature exceeds
+125°C; or ON/OFFis forced low. After a circuit-break-
er fault, the MAX5902L/MAX5903L keep the MOSFET
off until the power is cycled, or the part is reset by tog-
gling ON/OFFlow for 10ms (typ). After a circuit-breaker
fault, the MAX5902A/MAX5903A automatically restarts
in 150ms (typ). All versions automatically restart after a
thermal fault, or an undervoltage shutdown, if the fault
condition goes away for at least 150ms (typ).
ON/OFFoffers external control of the MAX5902/
MAX5903, facilitating power-supply sequencing, and
may also be used to change the undervoltage lockout
(UVL) level. UVLO keeps the external MOSFET
switched off as long as the input voltage is below the
desired level.
A power-good output, PGOOD(MAX5902) or PGOOD
(MAX5903), asserts when the external MOSFET is fully
enhanced and the source-drain voltage is below the
circuit-breaker threshold. PGOODand PGOOD are
open-drain outputs referenced to GND, and can with-
stand up to +72V.
GND
GATEDRAINVS50kΩ
50Ω
50kΩ
50kΩ
MAX5902
ON/OFFPGOOD
VIN
GND
GATEDRAINVS
MAX5902
ON/OFFPGOOD
VIN
GND
GATEDRAINVS
MAX5902
ON/OFFPGOODV
VIN
0 TO 0.5V
GND
GATEDRAINVS
MAX5902A
ON/OFFPGOOD
SCOPE
SCOPE
48VRL
GND
GATEDRAIN
IRFR5410
MAX5902
ON/OFFPGOOD
SCOPE
SCOPE
SCOPE
SCOPE
48V
GND
GATEDRAINVS
MAX5902
ON/OFFPGOOD
SCOPE
SCOPE
SCOPE
48V
(a) SUPPLY CURRENT(d) RETRY TIMEOUT
(d) STARTUP WAVEFORMS
(d) CIRCUIT-BREAKER EVENT
(b) VUVLO
(b) GATE DRIVE VOLTAGE
Figure 2. Test Circuits
MAX5902/MAX5903
+72V, SOT23/TDFN, Simple Swapper Hot-Swap
ControllersA thermal shutdown feature protects the external MOS-
FET by turning it off if the die temperature of the
MAX5902/MAX5903 exceeds +125°C. The MAX5902/
MAX5903 must be in good thermal contact with the
external MOSFET. See Layout Guidelinesin the Appli-
cationssection of the data sheet.
A circuit-breaker function monitors the voltage across
the external MOSFET, VSD, and turns off the MOSFET if
VSDexceeds the circuit-breaker threshold, VCB. The
circuit-breaker function is enabled after the MOSFET is
fully enhanced. Three threshold voltage options are
available—300mV, 400mV, and 500mV. One version is
available with no circuit-breaker function. Fault man-
agement for the MAX5902/MAX5903 is offered with two
different configurations; latched and automatic retry.
Latched Circuit BreakerAfter a circuit-breaker trip event, the latched
versions (MAX5902L/MAX5903L) drive GATE to
VS, turning off the external MOSFET, and PGOOD
(PGOOD) is deasserted. A latched off condition
needs to be reset by toggling ON/OFFlow for at
least 10ms, or by cycling the power supply, VS.
Automatic Retry Circuit BreakerAfter a circuit-breaker trip event, the automatic retry
versions (MAX5902A/MAX5903A) drive GATE to VS,
turning off the external MOSFET, and PGOOD
(PGOOD) is deasserted. If the start conditions are met
for a full 150ms (tRS) the start sequence is re-initiated.
The start conditions are: the device is not in UVLO;
ON/OFFis not driven low; and the device is not in ther-
mal shutdown.
No Circuit BreakerFor the versions without a circuit breaker, MAX5902N
(MAX5903N), PGOOD(PGOOD) are asserted when the
MOSFET is fully enhanced. Once powered up the
MAX5902N/MAX5903N ignore the MOSFET drain-to-
source voltage for applications where a circuit-breaker
function is not desired.
Applications Information
ON/OFFControl InputThe ON/OFFcontrol input provides three functions:
external ON/OFFcontrol; setting of the UVLO level; and
resetting after a circuit-breaker event has caused the
MAX5902L/MAX5903L to turn off the external MOSFET.
Pulling ON/OFFto GND for at least 10ms (tOFF) forces
the MAX5902/MAX5903 to turn off the external MOSFET
(see Figure 3 for a circuit example). To reset the
MAX5902L/MAX5903L after a circuit-breaker event,
toggle ON/OFFto GND for at least 10ms (tOFF).
ON/OFFcan be used to sequence power supplies.
Connecting a capacitor from ON/OFFto GND will delay
the rise of ON/OFFproportional to the capacitance and
input impedance of ON/OFF, typically 33kΩ(Figure 4).
The MAX5902/MAX5903 can be controlled by logic-
level signals. Logic-level signals of 3.3V or 1.8V may be
directly connected to ON/OFF. For 5V logic level control,
insert a series 47kΩresistor as shown in Figure 5.
Figure 4. Power-Supply Sequencing
HOT-SWAP CONTROLLER #1
GNDC
MAX5902
MAX5903
ON/OFF
HOT-SWAP CONTROLLER #2
GND
GND
MAX5902
MAX5903
ON/OFF
HOT-SWAP CONTROLLER
OPTIONAL
+24V
GND
40.2kΩ
3.01kΩ
MAX5902
MAX5903
GND
DGND
ON/OFF
ON/OFF
Figure 3. Programmed +18V Lockout, with Optional Optocoupler
On/Off Control.
