參數(shù)資料
型號： MAX5940DESA+T
廠商： Maxim Integrated Products
文件頁數(shù)： 1/15頁
文件大?。?/td> 0K
描述： IC IEEE 802.3AF PD INTFC 8-SOIC
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
控制器類型： 供電設(shè)備接口控制器（PD）
接口： IEEE 802.3af
電源電壓： 48V
電流 - 電源： 1mA
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SOIC
包裝： 帶卷 (TR)
General Description
The MAX5940A/MAX5940B/MAX5940C/MAX5940D pro-
vide complete interface function for a powered device
(PD) to comply with the IEEE 802.3af standard in a
power-over-ethernet system. MAX5940A/MAX5940B/
MAX5940C/MAX5940D provide the PD with a detection
signature, a classification signature, and an integrated
isolation switch with programmable inrush current control.
These devices also feature power-mode undervoltage
lockout (UVLO) with wide hysteresis and power-
good outputs. The MAX5940A/MAX5940B are available
with an absolute maximum rating of 80V and the
MAX5940C/MAX5940D are rated for an absolute maxi-
mum rating of 90V.
An integrated MOSFET provides PD isolation during
detection and classification. All devices guarantee a leak-
age current offset of less than 10A during the detection
phase. A programmable current limit prevents high inrush
current during power-on. The device features power-
mode UVLO with wide hysteresis and long deglitch time
to compensate for twisted-pair cable resistive drop and to
assure glitch-free transition between detection, classifica-
tion, and power-on/-off phases.
The MAX5940A/MAX5940C provide an active-high
(PGOOD) open-drain output and a fixed UVLO threshold.
The MAX5940B/MAX5940D provide both active-high
(PGOOD) and active-low (PGOOD) outputs and have an
adjustable UVLO threshold with the default value compli-
ant to the 802.3af standard. All devices are designed to
work with or without an external diode bridge.
The MAX5940A/MAX5940B/MAX5940C/MAX5940D are
available in 8-pin SO packages and are rated over the
extended temperature range of -40°C to +85°C.
Applications
IP Phones
Security Cameras
Wireless Access Nodes
IEEE 802.3af Power Devices
Computer Telephony
Features
Fully Integrated IEEE 802.3af-Compliant PD
Interface
PD Detection and Programmable Classification
Signatures
Less than 10A Leakage Current Offset During
Detection
Integrated MOSFET For Isolation and Inrush
Current Limiting
90V Absolute Maximum Rating
(MAX5940C/MAX5940D)
Gate Output Allows External Control of the
Internal Isolation MOSFET
Programmable Inrush Current Control
Programmable Undervoltage Lockout
(MAX5940B/MAX5940D Only)
Wide UVLO Hysteresis Accommodates Twisted-
Pair Cable Voltage Drop
PGOOD/PGOOD Outputs to Enable Downstream
DC-DC Converters
-40°C to +85°C Operating Temperature Range
MAX5940A/MAX5940B/MAX5940C/MAX5940D
IEEE 802.3af PD Interface Controller
For Power-Over-Ethernet
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
60V
68nF
GND
VEE
GATE
RCLASS
PGOOD
DC-DC CONVERTER
GND
-48V
RCL
*OPTIONAL.
GND
V+
LOAD
VREG
D1*
OUT
2
3
4
5
6
8
COUT
CGATE
RDISC
25.5k
Ω
SS_SHDN
MAX5014
MAX5940A
MAX5940C
D2*
Typical Operating Circuits
19-2991; Rev 2; 2/06
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.
EVALUATION
KIT
AVAILABLE
Pin Configurations appear at end of data sheet.
PART
TEMP RANGE
PIN-
PACKAGE
UVLO
MAX5940AESA
-40°C to +85°C
8 SO
Fixed
MAX5940BESA
-40°C to +85°C
8 SO
Adjustable
MAX5940CESA
-40°C to +85°C
8 SO
Fixed
MAX5940DESA
-40°C to +85°C
8 SO
Adjustable
Typical Operating Circuits continued at end of data sheet.
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MAX5941ACSE+T 功能描述:輸入/輸出控制器接口集成電路 IEEE 802.3af POE Int/PWM Controller RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray
MAX5941ACSE-T 功能描述:電源開關(guān) IC - POE / LAN RoHS:否 制造商:Fairchild Semiconductor 開關(guān)數(shù)量:Single 開關(guān)配置:SPST 開啟電阻（最大值）:7.3 Ohms 串話: 帶寬: 開啟時間（最大值）:13 ns 關(guān)閉時間（最大值）:20 ns 切換電壓（最大）: 工作電源電壓:8 V to 26 V 最大工作溫度:+ 125 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-220F-6
MAX5941AESE 功能描述:電源開關(guān) IC - POE / LAN RoHS:否 制造商:Fairchild Semiconductor 開關(guān)數(shù)量:Single 開關(guān)配置:SPST 開啟電阻（最大值）:7.3 Ohms 串話: 帶寬: 開啟時間（最大值）:13 ns 關(guān)閉時間（最大值）:20 ns 切換電壓（最大）: 工作電源電壓:8 V to 26 V 最大工作溫度:+ 125 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-220F-6
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