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MAX5922AEUIMAXIMN/a43avai+48V, Single-Port Network Power Switch For Power-Over-LAN
MAX5922BEUIMAXIMN/a50avai+48V, Single-Port Network Power Switch For Power-Over-LAN
MAX5922CEUIMAXIMN/a17avai+48V, Single-Port Network Power Switch For Power-Over-LAN


MAX5922BEUI ,+48V, Single-Port Network Power Switch For Power-Over-LANELECTRICAL CHARACTERISTICS(V = 48V, V = 3.3V, AGND_S = AGND = DGND = 0V, R = 0.5Ω ±1%, UVLO = open, ..
MAX5922CEUI ,+48V, Single-Port Network Power Switch For Power-Over-LANapplications and is fully compliant to the IEEE Power Device (PD) Detection and Classification802. ..
MAX5922CEUI+ ,+48V, Single-Port Network Power Switch For Power-Over-LANFeaturesThe MAX5922A/B/C is a single-port network power con-♦ IEEE 802.3af Complianttroller with an ..
MAX5924AEUB+ ,1V to 13.2V, n-Channel Hot-Swap Controllers Require No Sense ResistorFeaturesThe MAX5924/MAX5925/MAX5926 1V to 13.2V hot-swap ● Hot Swap 1V to 13.2V with V ≥ 2.25VCCcon ..
MAX5924AEUB+ ,1V to 13.2V, n-Channel Hot-Swap Controllers Require No Sense ResistorElectrical Characteristics(V , EN (MAX5924/MAX5925), EN1 (MAX5926) = +2.7V to +13.2V; EN2 (MAX5926) ..
MAX5924AEUB+T ,1V to 13.2V, n-Channel Hot-Swap Controllers Require No Sense ResistorApplications RCB● Base StationsCB SENSE GATE OUT● RAID● Remote-Access ServersVCC● Network Routers a ..
MAZ8100-H ,Silicon planar typeZener DiodesMAZ8000 SeriesSilicon planar typeUnit : mmFor stabilization of power supplyKA
MAZ8100-L ,Silicon planar typeElectrical characteristics within part numbers T = 25°CaTemperaturecoefficient ofZener voltage Rev ..
MAZ8100M ,Silicon planar typeAbsolute Maximum Ratings T = 25°CaMarking SymbolParameter Symbol Rating UnitRefer to the list of t ..
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 ..


MAX5922AEUI-MAX5922BEUI-MAX5922CEUI
+48V, Single-Port Network Power Switch For Power-Over-LAN
General Description
The MAX5922A/B/C is a single-port network power con-
troller with an integrated power MOSFET, operating from
a +32V to +60V supply rail. The device is specifically
designed for power-sourcing equipment (PSE) in power-
over-LAN applications and is fully compliant to the IEEE
802.3af standard. The MAX5922 provides power devices
(PD) discovery, classification, current limit, and other nec-
essary functions for an IEEE 802.3af compliant PSE.
The MAX5922 is suitable for PSE function in both
switch/router systems where the power is delivered to the
load through the signal pairs, and in midspan systems
where the power is delivered to the load through the
spare pairs. In midspan mode, a detection collision
avoidance circuit (MAX5922A/C only) provides the nec-
essary back-off timing to prevent fault detections that
happen when two different PSEs try to detect and
power the same PD. The MAX5922B/C have a detec-
tion disable input that can be connected high to disable
the detection/classification functions or connected low
to enable them.
The MAX5922 features a programmable undervoltage
lockout (UVLO) that keeps the device in shutdown until
the input voltage exceeds a certain threshold, set to 38V
(MAX5922A) or 28V (MAX5922B/C) internally. After suc-
cessfully discovering and classifying a PD, the MAX5922
enters startup mode. During startup, the MAX5922 limits
the output voltage and current slew rate to minimize EMI
(electromagnetic interference). The MAX5922 has an inte-
grated 0.45ΩN-channel power MOSFET that provides
efficient operation and simplified system design. The
MAX5922 monitors and provides current-limit protection
to the load at all times. The current limit is programmable
using an external current-sensing resistor. The MAX5922
features current-limit foldback and duty-cycle limit to
ensure robust operation during load-fault and short-circuit
conditions. Fault management allows the part to either
latch-off or autorestart after a fault.
The MAX5922 provides POK, ZC,and FAULTstatus sig-
nals to indicate output power is good, zero-current fault,
and other faults (overcurrent, overtemperature), respec-
tively. The MAX5922 is available in a 28-pin TSSOP pack-
age and is rated over the extended -40°C to +85°C
temperature range.
Features
IEEE 802.3af Compliant+32V to +60V Wide Operating Input Range 0.45ΩIntegrated Power SwitchPower Device (PD) Detection and Classification100µA PD Leakage Detection TolerantProgrammable Current LimitZero-Current Detection with Status OutputDetection Collision Avoidance Option for Midspan
Application
Input Logic Signals Compatible with 1.8V to 5V
CMOS Logic
Separate Analog and Digital Grounds with Up to
±4V Offset
Power-Good Status OutputOvercurrent and Overtemperature Protection with
Status Outputs
Current-Limit Foldback with Timeout and Duty-
Cycle Control
Latch or Autorestart Fault Management
Applications
MAX5922
+48V, Single-Port Network Power Switch
For Power-Over-LAN

19-2708; Rev 0; 4/03
Ordering Information
Typical Application Circuits, Selector Guide, and Pin
Configuration appear at end of data sheet.

Power-Sourcing Equipment (PSE)
Power-Over-LAN/Power-Over-MDI
(Media-Dependent Interface)
Computer Telephony
Single-Port Power Injector/Adapter
Midspan Power Injector
Switches/Routers with In-Line Power
MAX5922
+48V, Single-Port Network Power Switch
For Power-Over-LAN
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 with respect to AGND_S, unless otherwise noted.)
IN............................................................................-0.3V to +76V
UVLO........................................................................-0.3V to +6V
VDIGto DGND..........................................................-0.3V to +6V
OUT.......................................................-0.3V to (VDRAIN+ 0.3V)
DRAIN..........................................................-0.3V to (VIN+ 0.3V)
RDT.........................................................................-0.3V to +12V
RCL to IN................................................................-10V to +0.3V
EN, DET_DIS, DCA, CLASS, ZC_EN,
and LATCH to DGND...........................................-0.3V to +6V
POK, ZC, CL0, CL1, CL2, and FAULTto DGND......-0.3V to +6V
DGND..........................................................................-5V to +5V
Maximum Current into Drain.................................................0.8A
Maximum Current into POK, ZC, CL0, CL1, CL2, FAULT...20mA
Continuous Power Dissipation (TA= +70°C)
28-Pin TSSOP (Derate 12.8mW/°C above +70°C).....1026mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS

(VIN= 48V, VDIG= 3.3V, AGND_S = AGND = DGND = 0V, RSENSE= 0.5Ω±1%, UVLO = open, EN = VDIG, RRCL= 150Ω±1%, RRDT
MAX5922
+48V, Single-Port Network Power Switch
For Power-Over-LAN
ELECTRICAL CHARACTERISTICS (continued)

(VIN= 48V, VDIG= 3.3V, AGND_S = AGND = DGND = 0V, RSENSE= 0.5Ω±1%, UVLO = open, EN = VDIG, RRCL= 150Ω±1%, RRDT
MAX5922
+48V, Single-Port Network Power Switch
For Power-Over-LAN
ELECTRICAL CHARACTERISTICS (continued)

(VIN= 48V, VDIG= 3.3V, AGND_S = AGND = DGND = 0V, RSENSE= 0.5Ω±1%, UVLO = open, EN = VDIG, RRCL= 150Ω±1%, RRDT
design.
Note 2:
This is the time from an output overcurrent or short-circuit condition until the output goes into regulated current limit.
Note 3:
OUT voltage above which the output current limit is at its full value (see Figure 8).
Note 4:
To be consistent with the IEEE 802.3af standard, choose RSENSE= 0.5Ω±1%.
Note 5:
This is the time the part stays in current-limit mode during overload condition. After tOC elapses (or when the junction temperature
hits +150°C) the part shuts down.
Note 6:
See the Typical Operating Characteristicsand Figure 6.
Note 7:
This is the delay from IOUTfalling below the zero-current threshold until ZCgoes low and the IC shuts down (see the Zero-Current
Detectionsection).
Note 8:
See the Fault Managementsection.
Note 9:
PD is detected by the procedures specified by the IEEE 802.3af standard. A probe voltage VPBI(+4V typically) is forced at OUT
and the current IS1is measured after tDET/2. A second probe voltage VPBII(+8V typically) is then forced and IS2 measured after
tDET / 2 again. The voltage increment is then divided by the difference of the two currents (IS2- IS1). This is the PD resistance value.
MAX5922
+48V, Single-Port Network Power Switch
For Power-Over-LAN
VIN SUPPLY CURRENT
vs. INPUT VOLTAGE

MAX5922 toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)5752474237
VIN SUPPLY CURRENT
vs. TEMPERATURE
MAX5922 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)5035205-10-25
IDIG
DIGITAL SUPPLY CURRENT
vs. TEMPERATURE
MAX5922 toc03
TEMPERATURE (°C)5035205-10-25-4080
DEFAULT V
UVLO (V)
VIN UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
MAX5922 toc04
TEMPERATURE (°C)5035205-10-25-4080
ON-RESISTANCE (
MOSFET RDSON
vs. TEMPERATURE
MAX5922 toc05
TEMPERATURE (°C)5035205-10-25-4080
SENSE TRIP VOLTAGE
vs. TEMPERATURE

MAX5922 toc06
TEMPERATURE (°C)
SENSE TRIP VOLTAGE (V)653550-10520-25
FOLDBACK-CURRENT LIMIT
(ILIM vs. VOUT)
MAX5922 toc07
OUTPUT VOLTAGE (V)
ILIM (A)403035101520255
ZERO-CURRENT THRESHOLD VOLTAGE (mV)3.52
ZERO-CURRENT DETECTION THRESHOLD
VOLTAGE vs. TEMPERATURE
MAX5922 toc08
TEMPERATURE (°C)5035205-10-25-4080
ON-RESISTANCE vs. VDRAIN

MAX5922 toc09
INPUT VOLTAGE (V)
ON-RESISTANCE (524844403632
Typical Operating Characteristics
(MAX5922A, VIN= 48V, VDIG, EN, LATCH, CLASS, and ZC_EN = 3.3V, DCA, AGND_S = AGND = DGND = 0V, RSENSE= 0.5Ω±1%,
UVLO floating, RRCL= 150kΩ, RRDT= 18.2kΩ, TA= +25°C, unless otherwise noted.)
MAX5922
+48V, Single-Port Network Power Switch
For Power-Over-LAN
Typical Operating Characteristics (continued)

(MAX5922A, VIN= 48V, VDIG, EN, LATCH, CLASS, and ZC_EN = 3.3V, DCA, AGND_S = AGND = DGND = 0V, RSENSE= 0.5Ω±1%,
UVLO floating, RRCL= 150kΩ, RRDT= 18.2kΩ, TA= +25°C, unless otherwise noted.)
MAX5922
+48V, Single-Port Network Power Switch
For Power-Over-LAN
OVERCURRENT RESTART DELAY

MAX5922 toc19
400ms/div
20V/div
5V/div
500mA/div
5V/div
VOUT
POK
IOUT
FAULT
STARTUP WITH VALID
PD (25kΩ AND 0.1µF)

MAX5922 toc20
40ms/div
20V/div
5V/div
5V/div
200mA/div
VOUT
POK
IOUT
STARTUP WITH INVALID
PD (25kΩ AND 10µF)

MAX5922 toc21
100ms/div
5V/div
250µA/div
2V/div
VOUT
POK
IOUT
Typical Operating Characteristics (continued)

(MAX5922A, VIN= 48V, VDIG, EN, LATCH, CLASS, and ZC_EN = 3.3V, DCA, AGND_S = AGND = DGND = 0V, RSENSE= 0.5Ω±1%,
UVLO floating, RRCL= 150kΩ, RRDT= 18.2kΩ, TA= +25°C, unless otherwise noted.)
MAX5922
+48V, Single-Port Network Power Switch
For Power-Over-LAN
STARTUP WITH INVALID
PD (15kΩ)

MAX5922 toc22
100ms/div
5V/div
250µA/div
2V/div
VOUT
POK
STARTUP WITH INVALID
PD (33kΩ)

MAX5922 toc23
40ms/div
5V/div
250µA/div
2V/div
VOUT
IOUT
POK
STARTUP WITH OUTPUT
SHORTED TO AGND

MAX5922 toc24
100ms/div
5V/div
5V/div
500µA/div
2V/div
VOUT
IOUT
POK
STARTUP WITH MIDSPAN MODE
(DCA = VDIG, VALID PD (25kΩ AND 0.1µF))

MAX5922 toc25
100ms/div
5V/div
5V/div
500µA/div
20V/divVOUT
IOUT
POK
STARTUP WITH MIDSPAN MODE
(DCA = VDIG, INVALID PD (15kΩ))

MAX5922 toc26
400ms/div
5V/div
250µA/div
2V/div
VOUT
IOUT
POK
STARTUP WITH MIDSPAN MODE
(DCA = VDIG, INVALID PD (33kΩ))

MAX5922 toc27
400ms/div
5V/div
250µA/div
2V/div
VOUT
IOUT
POK
Typical Operating Characteristics (continued)

(MAX5922A, VIN= 48V, VDIG, EN, LATCH, CLASS, and ZC_EN = 3.3V, DCA, AGND_S = AGND = DGND = 0V, RSENSE= 0.5Ω±1%,
UVLO floating, RRCL= 150kΩ, RRDT= 18.2kΩ, TA= +25°C, unless otherwise noted.)
MAX5922
+48V, Single-Port Network Power Switch
For Power-Over-LAN
STARTUP WITH VALID PD
(25kΩ, ZC_EN = LOW)

MAX5922 toc28
100ms/div
5V/div
20V/div
1.25mA/div
VOUT
IOUT
POK
STARTUP WITH
DIFFERENT PD CLASSES

MAX5922 toc29
40ms/div
5V/div
5V/div
20mA/div
VOUT
IOUT
POK
OVERCURRENT TIMEOUT
(RLOAD FROM 240Ω to 75Ω)

MAX5922 toc30
2ms/div
5V/div
20V/div
200mA/div
VOUT
IOUT
POK
OUTPUT SHORT-CIRCUIT RESPONSE

MAX5922 toc31
200µs/div
200mA/div
20V/div
VOUT
IOUT
Typical Operating Characteristics (continued)

(MAX5922A, VIN= 48V, VDIG, EN, LATCH, CLASS, and ZC_EN = 3.3V, DCA, AGND_S = AGND = DGND = 0V, RSENSE= 0.5Ω±1%,
UVLO floating, RRCL= 150kΩ, RRDT= 18.2kΩ, TA= +25°C, unless otherwise noted.)
MAX5922
+48V, Single-Port Network Power Switch
For Power-Over-LAN

*This is not a device pin.
MAX5922
+48V, Single-Port Network Power Switch
For Power-Over-LAN
Pin Description (continued)

Figure 1. MAX5922 Block Diagram
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