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MAX5942ACSE+

Description
I/O controller interface IC ieee 802.3af poe int/pwm controller
CategoryPower/power management    The power supply circuit   
File Size449KB,24 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Environmental Compliance
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MAX5942ACSE+ Overview

I/O controller interface IC ieee 802.3af poe int/pwm controller

MAX5942ACSE+ Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
Parts packaging codeSOIC
package instructionSOP, SOP16,.25
Contacts16
Reach Compliance Codecompli
ECCN codeEAR99
Other featuresN
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage67 V
Minimum input voltage18 V
Nominal input voltage48 V
JESD-30 codeR-PDSO-G16
JESD-609 codee3
length9.9 mm
Humidity sensitivity level1
Number of functions1
Number of terminals16
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP16,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency314 kHz
technologyBICMOS
Temperature levelCOMMERCIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width3.9 mm
Base Number Matches1
19-3024; Rev 2; 9/04
IEEE 802.3af Power-Over-Ethernet
Interface/PWM Controller for Power Devices
General Description
The MAX5942A/MAX5942B integrate a complete power
IC for powered devices (PD) in a power-over-ethernet
(PoE) system. The MAX5942A/MAX5942B provide a PD
interface and a compact DC-DC PWM controller suitable
for flyback and forward converters in either isolated or
nonisolated designs.
The MAX5942A/MAX5942B PD interface complies with
the IEEE™ 802.3af standard, providing the PD with a
detection signature, a classification signature, and an
integrated isolation switch with programmable inrush cur-
rent control. These devices also feature power-mode
undervoltage lockout (UVLO) with wide hysteresis and
power-good status outputs.
The MAX5942A/MAX5942B also integrate all the build-
ing blocks necessary for implementing DC-DC fixed-
frequency isolated power supplies. This device is 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
frequency is internally trimmed to 275kHz ±10%, thus
reducing magnetics and filter components. The
MAX5942A allows an 85% operating duty cycle and can
be used to implement flyback converters. The MAX5942B
limits the operating duty cycle to less than 50% and can
be used in single-ended forward converters. The
MAX5942A/MAX5942B are designed to work with or with-
out an external diode bridge in front of the PD.
The MAX5942A/MAX5942B are available in 16-pin SO
packages.
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/ULVO
PGOOD/PGOOD Outputs Enable PWM
Controller
PWM Controller
Wide Input Range: 18V to 67V
Isolated (Without Optocoupler) or Nonisolated
Power Supply
Current-Mode Control
Leading-Edge Blanking
Internally Trimmed 275kHz ±10% Oscillator
Soft-Start
MAX5942A/MAX5942B
Ordering Information
PART
MAX5942AESE*
MAX5942ACSE
MAX5942BESE*
MAX5942BCSE
TEMP RANGE
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
PIN-
PACKAGE
16 SO
16 SO
16 SO
16 SO
MAX DUTY
CYCLE (%)
85
85
50
50
Applications
IP Phones
Wireless Access Nodes
Internet Appliances
Computer Telephony
Security Cameras
Power Devices in Power-Over-Ethernet/
Power-Over-MDI
*Future
product—contact factory for availability.
Pin Configuration
TOP VIEW
V+ 1
V
DD
2
FB 3
SS_SHDN 4
ULVO 5
16 V
CC
15 NDRV
14 V-
MAX5942A
MAX5942B
13 CS
12 GND
11 PGOOD
10 PGOOD
9
OUT
Typical Operating Circuit appears at end of data sheet.
RCL 6
GATE 7
V
EE
8
IEEE is a trademark of the Institute of Electrical and Electronics
Engineers.
SO
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.

MAX5942ACSE+ Related Products

MAX5942ACSE+ MAX5942ACSE+T MAX5942AESE+T MAX5942BESE+
Description I/O controller interface IC ieee 802.3af poe int/pwm controller I/O controller interface IC ieee 802.3af poe int/pwm controller I/O controller interface IC ieee 802.3af poe int/pwm controller I/O controller interface IC ieee 802.3af poe int/pwm controller
Is it lead-free? Lead free Lead free Lead free Lead free
Is it Rohs certified? conform to conform to conform to conform to
Parts packaging code SOIC SOIC SOIC SOIC
package instruction SOP, SOP16,.25 SOP, SOP16,.25 SOP, SOP16,.25 SOP, SOP16,.25
Contacts 16 16 16 16
Reach Compliance Code compli compli compli compli
ECCN code EAR99 EAR99 EAR99 EAR99
Other features N N N N
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 67 V 67 V 67 V 67 V
Minimum input voltage 18 V 18 V 18 V 18 V
Nominal input voltage 48 V 48 V 48 V 48 V
JESD-30 code R-PDSO-G16 R-PDSO-G16 R-PDSO-G16 R-PDSO-G16
JESD-609 code e3 e3 e3 e3
length 9.9 mm 9.9 mm 9.9 mm 9.9 mm
Humidity sensitivity level 1 1 1 1
Number of functions 1 1 1 1
Number of terminals 16 16 16 16
Maximum operating temperature 70 °C 70 °C 85 °C 85 °C
Maximum output current 1 A 1 A 1 A 1 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SOP SOP SOP SOP
Encapsulate equivalent code SOP16,.25 SOP16,.25 SOP16,.25 SOP16,.25
Package shape RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE
Peak Reflow Temperature (Celsius) 260 260 260 260
Certification status Not Qualified Not Qualified Not Qualified Not Qualified
Maximum seat height 1.75 mm 1.75 mm 1.75 mm 1.75 mm
surface mount YES YES YES YES
Switch configuration SINGLE SINGLE SINGLE SINGLE
Maximum switching frequency 314 kHz 314 kHz 314 kHz 314 kHz
technology BICMOS BICMOS BICMOS BICMOS
Temperature level COMMERCIAL COMMERCIAL INDUSTRIAL INDUSTRIAL
Terminal surface Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn)
Terminal form GULL WING GULL WING GULL WING GULL WING
Terminal pitch 1.27 mm 1.27 mm 1.27 mm 1.27 mm
Terminal location DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
width 3.9 mm 3.9 mm 3.9 mm 3.9 mm
Base Number Matches 1 1 - 1
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