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MAX5941ACSEMAXIMN/a448avaiIEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices
MAX5941BCSEMAXIMN/a14avaiIEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices
MAX5941BESEMAXINN/a120avaiIEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices


MAX5941ACSE ,IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power DevicesFeaturesThe MAX5941A/MAX5941B integrate a complete power Powered Device InterfaceIC for powered de ..
MAX5941BCSE ,IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power DevicesApplicationsMAX5941BCSE 0°C to +70°C 16 SO 50IP PhonesWireless Access NodesPin ConfigurationInterne ..
MAX5941BESE ,IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power DevicesELECTRICAL CHARACTERISTICS (continued)(V = (GND - V ) = 48V, GATE = PGOOD = PGOOD = OPEN, V- tied t ..
MAX5941BESE+T ,IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power DevicesFeaturesThe MAX5941A/MAX5941B integrate a complete power♦ Powered Device InterfaceIC for powered de ..
MAX5942AESE ,IEEE 802.3af power-over-ethernet interface/PWM controller for power deviceFeaturesThe MAX5942A/MAX5942B integrate a complete power  Powered Device InterfaceIC for powered d ..
MAX5942BCSE ,IEEE 802.3af Power-Over-Ethernet Interface/PWM Controller for Power DevicesFeaturesThe MAX5942A/MAX5942B integrate a complete power  Powered Device InterfaceIC for powered d ..
MAZ8130-H ,Silicon planar typeZener DiodesMAZ8000 SeriesSilicon planar typeUnit : mmFor stabilization of power supplyKA
MAZ8130L ,Silicon planar typeZener DiodesMAZ8000 SeriesSilicon planar typeUnit : mmFor stabilization of power supplyKA
MAZ8130-L ,Silicon planar typeElectrical Characteristics T = 25°CaParameter Symbol Conditions Min Typ Max UnitForward voltage V ..
MAZ8130-M ,Silicon planar typeElectrical characteristics within part numbers T = 25°CaTemperaturecoefficient ofZener voltage Rev ..
MAZ8150G ,Silicon planar typeFeatures Package Extremely low noise voltage caused from the diode (2.4 V to Code 39V, 1/3 to 1 ..
MAZ8150-H ,Silicon planar typeZener DiodesMAZ8000 SeriesSilicon planar typeUnit : mmFor stabilization of power supplyKA


MAX5941ACSE-MAX5941BCSE-MAX5941BESE
IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices
General Description
The MAX5941A/MAX5941B integrate a complete power
IC for powered devices (PD) in a power-over-ethernet
(PoE) system. The MAX5941A/MAX5941B provide a PD
interface and a compact DC-DC PWM controller suitable
for flyback and forward converters in either isolated or
nonisolated designs.
The MAX5941A/MAX5941B PD interface complies with
the IEEE 802.3af standard, providing the PD with a detec-
tion signature, a classification signature, and an integrat-
ed isolation switch with programmable inrush current
control. These devices also feature power-mode under-
voltage lockout (UVLO) with wide hysteresis and power-
good status outputs.
The MAX5941A/MAX5941B also integrate all the building
blocks necessary for implementing DC-DC fixed-
frequency isolated power supplies. These devices are a
current-mode controller with an integrated high startup
circuit suitable for isolated telecom/industrial voltage-
range power supplies. A high-voltage startup circuit
allows the PWM controller to draw power directly from the
18V to 67V input supply during startup. The switching fre-
quency is internally trimmed to 275kHz ±10%, thus
reducing magnetics and filter components. The
MAX5941A allows an 85% operating duty cycle and can
be used to implement flyback converters. The MAX5941B
limits the operating duty cycle to less than 50% and can
be used in single-ended forward converters. The
MAX5941A/MAX5941B are designed to work with or with-
out an external diode bridge in front of the PD.
The MAX5941A/MAX5941B are available in 16-pin SO
packages.
Applications
Phones
Wireless Access Nodes
Internet Appliances
Computer Telephony
Security Cameras
Power Devices in Power-Over-Ethernet/
Power-Over-MDI
Features
Powered Device Interface
Fully Integrated IEEE 802.3af-Compliant PD
Interface
PD Detection and Programmable Classification
Signatures
Less than 10µA Leakage Current Offset During
Detection
Integrated MOSFET for Isolation and Inrush
Current Limiting
Gate Output Allows External Control of the
Internal Isolation FET
Programmable Inrush Current Control
Programmable Undervoltage Lockout
PWM Controller
Wide Input Range: 18V to 67V
Current-Mode Control
Leading-Edge Blanking
Internally Trimmed 275kHz ±10% Oscillator
Soft-Start
MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
Ordering Information

19-3069; Rev 0; 10/03
Typical Operating Circuit appears at end of data sheet.
Pin Configuration
MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VIN= (GND - VEE) = 48V, GATE = PGOOD= PGOOD = OPEN, V- tied to OUT, V+ tied to GND, UVLO = VEE, TA= TMINto +TMAX,
unless otherwise noted. Typical values are at TA= +25°C. All voltages are referenced to VEE, unless otherwise noted.) (Note 1)
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 are referenced to VEE, unless otherwise noted.)
GND........................................................................-0.3V to +80V
OUT, PGOOD...........................................-0.3V to (GND + 0.3V)
RCL, GATE.............................................................-0.3V to +12V
UVLO........................................................................-0.3V to +8V
PGOOD to OUT.........................................-0.3V to (GND + 0.3V)
V+ to V-...................................................................-0.3V to +80V
VDDto V-.................................................................-0.3V to +40V
VCCto V-..............................................................-0.3V to +12.5V
OPTO, NDRV, SS_SHDN, CS to V-.............-0.3V to (VCC+ 0.3V)
Maximum Input/Output Current (Continuous)
OUT to VEE...................................................................500mA
GND, RCL to VEE............................................................70mA
UVLO, PGOOD, PGOOD to VEE.....................................20mA
GATE to VEE....................................................................80mA
VDD, VCC.........................................................................20mA
NDRV Continuous...........................................................25mA
NDRV (Pulsed for less than 1µs).......................................±1A
Continuous Power Dissipation (TA= +70°C)
16-Pin SO (derate 9.1mW/°C above +70°C)................727mW
Operating Temperature Range
MAX5941_CSE ..................................................0°C to +70°C
MAX5941_ESE ...............................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) ................................+300°C
MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
ELECTRICAL CHARACTERISTICS (continued)

(VIN= (GND - VEE) = 48V, GATE = PGOOD= PGOOD = OPEN, V- tied to OUT, V+ tied to GND, UVLO = VEE, TA= TMINto +TMAX,
ELECTRICAL CHARACTERISTICS (PWMController)
MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
ELECTRICAL CHARACTERISTICS (PWMController) (continued)

(All voltages referenced to V-. VDD= 13V, a 10µF capacitor connects VCCto V-, VCS= V-, V+ = 48V, 0.1µF capacitor connected to
MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
Note 1:
All min/max limits for the PD interface are production tested at +85°C (extended grade)/+70°C (commercial grade). Limits
at +25°C and -40°C are guaranteed by design. All PWM controller min/max limits are 100% production tested at +25°C
and +85°C (extended grade)/+70°C (commercial grade). Limits at -40°C are guaranteed by design, unless otherwise
noted.
Note 2:
The input offset current is illustrated in Figure 1.
Note 3:
Effective differential input resistance is defined as the differential resistance between GND and VEEwithout any external
resistance.
Note 4:
Classification current is turned off whenever the IC is in power mode.
Note 5:
See Table 2 in the PD Classification Modesection. RDISCand RCLmust be 100ppm or better.
Note 6:
See Thermal Dissipation sectionfor details.
Note 7:
When UVLO is connected to the midpoint of an external resistor-divider with a series resistance of 25.5kΩ(±1%), the turn-
on threshold set point for the power mode is defined by the external resistor-divider. Make sure the voltage on the UVLO
pin does not exceed its maximum rating of 8V when VINis at the maximum voltage.
Note 8:
When the VUVLOis below VTH, G, UVLO,the MAX5941 sets the turn-on voltage threshold internally (VUVLO,ON).
Note 9:
An input voltage or VUVLOglitch below their respective thresholds shorter than or equal to tOFF_DLYdoes not cause the
MAX5941A/MAX5941B to exit power-on mode (as long as the input voltage remains above an operable voltage level of 12V).
Note 10:
PGOOD references to OUT while PGOODreferences to VEE.
Note 11:
Guaranteed by design.
MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
DETECTION CURRENT vs. INPUT VOLTAGE

MAX5941A/B toc01
INPUT VOLTAGE (V)
DETECTION CURRENT (mA)642
CLASSIFICATION CURRENT
vs. INPUT VOLTAGE
MAX5941A/B toc02
INPUT VOLTAGE (V)
CLASSIFICATION CURRENT (mA)201530
EFFECTIVE DIFFERENTIAL INPUT
RESISTANCE vs. INPUT VOLTAGE

MAX5941A/B toc03
INPUT VOLTAGE (V)
EFFECTIVE DIFFERENTIAL INPUT RESISTANCE (M105
OFFSET CURRENT
vs. INPUT VOLTAGE
MAX5941A/B toc04
INPUT VOLTAGE (V)
OFFSET CURRENT (642910753
NORMALIZED UVLO
vs. TEMPERATURE
MAX5941A/B toc05
TEMPERATURE (°C)
NORMALIZED UVLO3510-15
PGOOD OUTPUT LOW VOLTAGE
vs. CURRENT
MAX5941A/B toc06
ISINK (mA)
PGOOD
(mV)1248
PGOOD OUTPUT LOW VOLTAGE
vs. CURRENT
MAX5941A/B toc07
ISINK (mA)
PGOOD
(mV)1284
OUT LEAKAGE CURRENT
vs. TEMPERATURE
MAX5941A/B toc08
INPUT VOLTAGE (V)
OUT LEAKAGE CURRENT (nA)3510-15
INRUSH CURRENT CONTROL
(VIN = 12V)
MAX5941toc09
VGATE
5V/div
IINRUSH
100mA/div
VOUT
10V/div
PGOOD
10V/div
1ms/div
Typical Operating Characteristics

(VIN= (GND - VEE) = 48V, GATE = PGOOD= PGOOD = OUT = OPEN, UVLO = VEE, VDD= 13V, NDRV floating, TA= TMINto TMAX.
Typical values are at TA= +25°C. All voltages are referenced to VEE(for graphs 1–11 in the Typical Operating Characteristics), all
voltages are referenced to V- (for graphs 12–30 in the Typical Operating Characteristics), unless otherwise noted.)
MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
INRUSH CURRENT CONTROL
(VIN = 48V)

MAX5941toc10
VGATE
5V/div
IINRUSH
100mA/div
VOUT
50V/div
PGOOD
50V/div
2ms/div
INRUSH CURRENT CONTROL
(VIN = 67V)

MAX5941toc11
VGATE
5V/div
IINRUSH
100mA/div
VOUT
50V/div
PGOOD
50V/div
2ms/div
VSS_SHDN vs. TEMPERATURE
(AT THE END OF SOFT-START)
MAX5941A/B toc12
TEMPERATURE (°C)
SS_SHDN
(V) (NORMALIZED TO V
REF
= 2.4V)
NDRV FREQUENCY
vs. TEMPERATURE
MAX5941A/B toc13
TEMPERATURE (°C)
NDRV FREQUENCY (kHz)
MAXIMUM DUTY CYCLE
vs. TEMPERATURE
MAX5941A/B toc14
TEMPERATURE (°C)
MAXIMUM DUTY CYCLE (%)
MAXIMUM DUTY CYCLE
vs. TEMPERATURE
MAX5941A/B toc15
TEMPERATURE (°C)
MAX DUTY CYCLE (%)
V+ SUPPLY CURRENT
vs. TEMPERATURE

MAX5941A/B toc16
V+ INPUT CURRENT (mA)
TEMPERATURE (°C)
Typical Operating Characteristics (continued)

(VIN= (GND - VEE) = 48V, GATE = PGOOD= PGOOD = OUT = OPEN, UVLO = VEE, VDD= 13V, NDRV floating, TA= TMINto TMAX.
Typical values are at TA= +25°C. All voltages are referenced to VEE(for graphs 1–11 in the Typical Operating Characteristics), all
voltages are referenced to V- (for graphs 12–30 in the Typical Operating Characteristics), unless otherwise noted.)
MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices

V+ SHUTDOWN CURRENT
vs. TEMPERATURE
MAX5941A/B toc19
TEMPERATURE (°C)
V+ SHUTDOWN CURRENT (
CS THRESHOLD VOLTAGE
vs. TEMPERATURE
MAX5941A/B toc20
CS THRESHOLD VOLTAGE (V)
NDRV RESISTANCE
vs. TEMPERATURE

MAX5941A/B toc21
NDRV RESISTANCE (
TEMPERATURE (°C)
CURRENT-LIMIT DELAY
vs. TEMPERATURE
MAX5941A/B toc22
TEMPERATURE (°C)
CURRENT-LIMIT DELAY (ns)
NDRV FREQUENCY vs. VDD
MAX5941A/B toc24
VDD (V)
NDRV FREQUENCY (kHz)ypical Operating Characteristics (continued)
(VIN= (GND - VEE) = 48V, GATE = PGOOD= PGOOD = OUT = OPEN, UVLO = VEE, VDD= 13V, NDRV floating, TA= TMINto TMAX.
Typical values are at TA= +25°C. All voltages are referenced to VEE(for graphs 1–11 in the Typical Operating Characteristics), all
voltages are referenced to V- (for graphs 12–30 in the Typical Operating Characteristics), unless otherwise noted.)
MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices

MAXIMUM DUTY CYCLE vs.VDD
MAX5941A/B toc25
VDD (V)
MAXIMUM DUTY CYCLE (%)
VCC vs. VDD
MAX5941A/B toc26
VDD (V)
(V)
V+ SUPPLY CURRENT
vs. V+ VOLTAGE
MAX5941A/B toc27
V+ VOLTAGE (V)
V+ SUPPLY CURRENT (mA)
V+ INPUT CURRENT vs. VOLTAGE
(AFTER STARTUP)
MAX5941A/B toc28
V+ VOLTAGE (V)
V+ INPUT CURRENT (
VCC VOLTAGE vs. VCC CURRENT
MAX5941A/B toc29
VCC CURRENT (mA)
VOLTAGE (V)5101520
VCC VOLTAGE vs. VCC CURRENT
MAX5941A/B toc30
VCC CURRENT (mA)
VOLTAGE (V)
Typical Operating Characteristics (continued)

(VIN= (GND - VEE) = 48V, GATE = PGOOD= PGOOD = OUT = OPEN, UVLO = VEE, VDD= 13V, NDRV floating, TA= TMINto TMAX.
Typical values are at TA= +25°C. All voltages are referenced to VEE(for graphs 1–11 in the Typical Operating Characteristics), all
voltages are referenced to V- (for graphs 12–30 in the Typical Operating Characteristics), unless otherwise noted.)
MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
MAX5941A/MAX5941B
Pin Description
MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
MAX5941A/MAX5941B
Detailed Description

The MAX5941A/MAX5941B integrate a complete power
IC for powered devices (PDs) in a power-over-ethernet
(PoE) system. The MAX5941A/MAX5941B provide PD
interface and a compact DC-DC PWM controller suitable
for flyback and forward converters in either isolated or
nonisolated designs.
The MAX5941A/MAX5941B powered device (PD) inter-
face complies with the IEEE 802.3af standard, providing
the PD with a detection signature, a classification signa-
ture, and an integrated isolation switch with programma-
ble inrush current control. These devices also feature
power-mode undervoltage lockout (UVLO) with wide hys-
teresis, and power-good status outputs.
An integrated MOSFET provides PD isolation during
detection and classification. The MAX5941A/MAX5941B
guarantee a leakage current offset of less than 10µA dur-
ing the detection phase. A programmable current limit
prevents high inrush current during power-on. The
devices feature power-mode UVLO with wide hysteresis
and long deglitch time to compensate for twisted-pair
cable resistive drop and to ensure glitch-free transition
between detection, classification, and power-on/off phas-
es. The MAX5941A/MAX5941B provide both active-high
(PGOOD) and active-low (PGOOD) outputs. Both
devices offer an adjustable UVLO threshold with a
default value compliant to the IEEE 802.3af standard.
The MAX5941A/MAX5941B are designed to work with or
without an external diode bridge in front of the PD.
Use the MAX5941A/MAX5941B PWM current-mode con-
trollers to design flyback- or forward-mode power sup-
plies. Current-mode operation simplifies control-loop
design while enhancing loop stability. An internal high-
voltage startup regulator allows the device to connect
directly to the input supply without an external startup
resistor. Current from the internal regulator starts the con-
troller. Once the tertiary winding voltage is established,
the internal regulator is switched off and bias current for
running the PWMcontroller is derived from the tertiary
winding. The internal oscillator is set to 275kHz and
trimmed to ±10%. This permits the use of small magnetic
components to minimize board space. Both the
MAX5941A and MAX5941B can be used in power sup-
plies providing multiple output voltages. A functional dia-
gram of the PWMcontroller is shown in Figure 4. Typical
applications circuits for forward and flyback topologies
are shown in Figure 5 and Figure 6, respectively.
Powered Device Interface
Operating Modes

The powered device (PD) front-end section of the
MAX5941A/MAX5941B operates in three different modes:
PD detection signature, PD classification, and PD power,
depending on its input voltage (VIN= GND - VEE). All
voltage thresholds are designed to operate with or with-
out the optional diode bridge while still complying with
the IEEE 802.3af standard (see Application Circuit 1).
Detection Mode (1.4V ≤VIN
10.1V)
In detection mode, the power source equipment (PSE)
applies two voltages on VINin the range of 1.4V to
10.1V (1V step minimum), and then records the current
measurements at the two points. The PSE then com-
putes ∆V/∆I to ensure the presence of the 25.5kΩsig-
nature resistor. In this mode, most of the MAX5941A/
MAX5941B internal circuitry is off and the offset current
is less than 10µA.
If the voltage applied to the PD is reversed, install pro-
tection diodes on the input terminal to prevent internal
damage to the MAX5941A/MAX5941B (see Figure 7).
Since the PSE uses a slope technique (∆V/∆I) to calcu-
late the signature resistance, the DC offset due to the
protection diodes is subtracted and does not affect the
detection process.
Classification Mode (12.6V ≤VIN
20V)
In the classification mode, the PSE classifies the PD
based on the power consumption required by the PD.
This allows the PSE to efficiently manage power distribu-
tion. The IEEE 802.3af standard defines five different
classes as shown in Table 1. An external resistor (RCL)
connected from RCL toVEEsets the classification current.
MAX5941A/MAX5941B
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
MAX5941A/MAX5941B
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