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MAX5922AEUI+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
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 0.45Ω N-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 FAULT status 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
♦ 0.45Ω Integrated Power Switch
♦ Power Device (PD) Detection and Classification
♦ 100µA PD Leakage Detection Tolerant
♦ Programmable Current Limit
♦ Zero-Current Detection with Status Output
♦ Detection 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 Output
♦ Overcurrent 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
________________________________________________________________ Maxim Integrated Products 1
19-2708; Rev 0; 4/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE
MAX5922AEUI -40°C to +85°C 28 TSSOP
MAX5922BEUI -40°C to +85°C 28 TSSOP
MAX5922CEUI -40°C to +85°C 28 TSSOP
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
2 _______________________________________________________________________________________
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
V
DIG
to DGND ..........................................................-0.3V to +6V
OUT .......................................................-0.3V to (V
DRAIN
+ 0.3V)
DRAIN..........................................................-0.3V to (V
IN
+ 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 FAULT to 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 (T
A
= +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
(V
IN
= 48V, V
DIG
= 3.3V, AGND_S = AGND = DGND = 0V, R
SENSE
= 0.5Ω ±1%, UVLO = open, EN = V
DIG
, R
RCL
= 150Ω ±1%, R
RDT
= 18.2kΩ ±1%, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Analog Input Voltage Range V
IN
32 60 V
Analog Input Supply Current I
IN
V
IN
= 60V, measured at AGND after OUT
has stopped slewing
11.6mA
Digital Input Voltage Range V
DIG
1.65 5.50 V
Digital Input Supply Current I
DIG
V
DIG
= 5V 0.05 0.1 mA
DGND to AGND Operating
Voltage Range
-4 +4 V
Current-Limit Response Time OUT shorted to AGND (Note 2) 1 µs
OUT Current-Limit Foldback
Voltage
V
FBSTOP
(Note 3) 18 V
Maximum voltage across R
SENSE
at V
OUT
>
V
FBSTOP
198 212 223
Current-Limit Sense Voltage
(V
IN
- V
DRS
) (Note 4)
V
ILIM
0°C to +70°C 203 212 221
mV
Current-Limit Sense Foldback
Voltage (V
IN
- V
DRS
)
V
ILIM_fb
V
OUT
= 0V 64 70 76 mV
Overcurrent Timeout t
OC
OUT shorted to AGND (Note 5) 50 60 75 ms
T
A
= +25°C0.45
D
MOS
On-Resistance R
DSON
I
OUT
= 100mA
T
A
= +85°C0.75
Ω
Power-Off OUT Sink Current EN = DGND, V
OUT
= 48V 15 µA
Maximum Output Voltage Slew
Rate
dV
OUT
/dt V
OUT
rising, no load 100 V/ms
Maximum Output Current Slew
Rate
dI
OUT
/dt V
OUT
rising, C
LOAD
= 100µF 35 A/ms
V
OUT
rising, POK from low to high 650 750 850 mV
Power-OK Threshold (V
IN
- V
OUT
)V
THPOK
Hysteresis 10 %
POK Output Low Voltage V
POK_LOW
I
POK
= 3mA 0.4 V
POK Output Leakage Current V
POK
= 3.3V 0.05 1 µA
MAX5922
+48V, Single-Port Network Power Switch
For Power-Over-LAN
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 48V, V
DIG
= 3.3V, AGND_S = AGND = DGND = 0V, R
SENSE
= 0.5Ω ±1%, UVLO = open, EN = V
DIG
, R
RCL
= 150Ω ±1%, R
RDT
= 18.2kΩ ±1%, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
t
POK_LOW
POK from high to low, V
OUT
falling 1.0 1.4 1.8
POK Output Delay (Note 6)
t
POK_HIGH
POK from low to high, V
OUT
rising 74 88 102
ms
Zero-Current Detection Threshold
Voltage (V
IN
- V
DRS
)
V
ZCTH
(Note 4) 2.7 3.75 4.8 mV
ZC Output Low Voltage V
ZC_LOW
I
ZC
= 3mA 0.4 V
ZC Output Leakage Current V
ZC
= 3.3V 0.05 1 µA
Zero-Current Detection Delay t
ZCDEL
ZC
from high to low, I
OUT
falling (Note 7) 300 350 400 ms
Zero-Current Deglitch Time t
ZC_DEG
I
OUT
rising 10 ms
Temperature rising 150 °C
Thermal Shutdown
Hysteresis 30 °C
Shutdown Autorestart Time t
RESTART
LATCH = low (Note 8) 1.60 1.92 2.24 s
UNDERVOLTAGE LOCKOUT
MAX5922A 36 38 40
UVLO floating, V
IN
rising
MAX5922B/
MAX5922C
26 28 30
MAX5922A 4.4
Default V
IN
UVLO UVLO
TH
Hysteresis
MAX5922B/C 2.5
V
MAX5922A 1.36 1.38 1.41
Referenced to AGND_S,
V
UVLO
rising
MAX5922B/
MAX5922C
1.31 1.33 1.36
V
MAX5922A 160
UVLO Comparator Threshold V
REF
Hysteresis
MAX5922B/
MAX5922C
120
mV
UVLO Input Resistance 50 kΩ
LOGIC SIGNALS
EN, LATCH, DCA, DET_DIS
CLASS, and ZC_EN Input High
Voltage
V
IH
1.65V < V
DIG
< 5.5V
0.7 ×
V
DIG
V
1.65V < V
DIG
< 2.0V
0.3 ×
V
DIG
EN, LATCH, DCA, DET_DIS
CLASS, and ZC_EN Input Low
Voltage
V
IL
2.0V < V
DIG
< 5.5V 0.8
V
EN, LATCH, DCA, DET_DIS
CLASS, and ZC_EN Input Current
-1 +1 µA
EN Low Pulse Width 3µs
FAULT, CL0, CL1 and CL2,
Output Low Voltage
V
OL
I
SINK
= 3mA 0.4 V
FAULT, CL0, CL1 and CL2,
Output Leakage Current
V
FAULT
= V
CL0
= V
CL1
= V
CL2
= 3.3V,
CLASS = 0V
0.05 1 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

MAX5922AEUI+T

Mfr. #:
Buy MAX5922AEUI+T
Manufacturer:
Maxim Integrated
Description:
Hot Swap Voltage Controllers 48V Single-Port Network Power Switch
Lifecycle:
New from this manufacturer.
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