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MAX5941

Description
1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
Categorysemiconductor    Analog mixed-signal IC   
File Size371KB,24 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet Parametric Compare View All

MAX5941 Overview

1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16

MAX5941 Parametric

Parameter NameAttribute value
Number of functions1
Number of terminals16
Maximum operating temperature70 Cel
Minimum operating temperature0.0 Cel
Maximum supply/operating voltage67 V
Minimum supply/operating voltage18 V
Rated supply voltage48 V
Processing package description0.150 INCH, MS-012AC, SOP-16
stateACTIVE
CraftsmanshipBICMOS
packaging shapeRECTANGULAR
Package SizeSMALL OUTLINE
surface mountYes
Terminal formGULL WING
Terminal spacing1.27 mm
terminal coatingTIN LEAD
Terminal locationDUAL
Packaging MaterialsPLASTIC/EPOXY
Temperature levelCOMMERCIAL
Number of channels1
Adjustable thresholdYes
Analog IC other typesPOWER SUPPLY SUPPORT CKT
19-3069; Rev 0; 10/03
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.
Features
o
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
o
PWM Controller
Wide Input Range: 18V to 67V
Current-Mode Control
Leading-Edge Blanking
Internally Trimmed 275kHz ±10% Oscillator
Soft-Start
MAX5941A/MAX5941B
Ordering Information
PART
MAX5941AESE
MAX5941ACSE
MAX5941BESE
MAX5941BCSE
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
Pin Configuration
TOP VIEW
V+ 1
V
DD
2
OPTO 3
SS_SHDN 4
ULVO 5
16 V
CC
15 NDRV
14 V-
MAX5941A
MAX5941B
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
SO
________________________________________________________________
Maxim Integrated Products
1
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.

MAX5941 Related Products

MAX5941 MAX5941A-MAX5941B
Description 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
Number of functions 1 1
Number of terminals 16 16
Maximum operating temperature 70 Cel 70 Cel
Minimum operating temperature 0.0 Cel 0.0 Cel
Maximum supply/operating voltage 67 V 67 V
Minimum supply/operating voltage 18 V 18 V
Rated supply voltage 48 V 48 V
Processing package description 0.150 INCH, MS-012AC, SOP-16 0.150 INCH, MS-012AC, SOP-16
state ACTIVE ACTIVE
Craftsmanship BICMOS BICMOS
packaging shape RECTANGULAR RECTANGULAR
Package Size SMALL OUTLINE SMALL OUTLINE
surface mount Yes Yes
Terminal form GULL WING GULL WING
Terminal spacing 1.27 mm 1.27 mm
terminal coating TIN LEAD TIN LEAD
Terminal location DUAL DUAL
Packaging Materials PLASTIC/EPOXY PLASTIC/EPOXY
Temperature level COMMERCIAL COMMERCIAL
Number of channels 1 1
Adjustable threshold Yes Yes
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