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參數(shù)資料
| 型號(hào)： | MAX5940A-MAX5940B |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quadruple 2-Input Positive-NAND Buffers 14-CDIP -55 to 125 |
| 中文描述： | IEEE 802.3af標(biāo)準(zhǔn)的PD接口控制器，用于供電以太網(wǎng) |
| 文件頁數(shù)： | 1/15頁 |
| 文件大小： | 295K |
| 代理商： | MAX5940A-MAX5940B |
General Description
The MAX5940A/MAX5940B provide complete interface
function for a powered device (PD) to comply with the
IEEE 802.3af standard in a power-over-ethernet system.
MAX5940A/MAX5940B provide the PD with a detection
signature, a classification signature, and an integrated
isolation switch with programmable inrush current con-
trol. These devices also feature power-mode undervolt-
age lockout (UVLO) with wide hysteresis, and
power-good outputs.
An integrated MOSFET provides PD isolation during
detection and classification. The MAX5940A/MAX5940B
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 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, classification, and power-on/-off phases.
The MAX5940A provides an active-high (PGOOD) open-
drain output and a fixed UVLO threshold. The MAX5940B
provides both active-high (PGOOD) and active-low
(
PGOOD)
outputs and has an adjustable UVLO threshold
with the default value compliant to the 802.3af standard.
The MAX5940A/MAX5940B are designed to work with or
without an external diode bridge.
The MAX5940A/MAX5940B are available in 8-pin SO
packages and are rated over the extended temperature
range of -40°C to +85°C.
Applications
Security Cameras
IEEE 802.3af Power Devices
IP Phones
Wireless Access Nodes
Computer Telephony
Features
o
Fully Integrated IEEE 802.3af-Compliant PD
Interface
o
PD Detection and Programmable Classification
Signatures
o
Less than 10μA Leakage Current Offset During
Detection
o
Integrated MOSFET For Isolation and Inrush
Current Limiting
o
Gate Output Allows External Control of the
Internal Isolation MOSFET
o
Programmable Inrush Current Control
o
Programmable Undervoltage Lockout
(MAX5940B Only)
o
Wide UVLO Hysteresis Accommodates Twisted-
Pair Cable Voltage Drop
o
PGOOD/
PGOOD
Outputs to Enable Downstream
DC-DC Converters
o
-40°C to +85°C Operating Temperature Range
M
IEEE 802.3af PD Interface Controller
For Power-Over-Ethernet
________________________________________________________________
Maxim Integrated Products
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.
1
Ordering Information
60V
68nF
GND
V
EE
GATE
PGOOD
DC-DC CONVERTER
GND
-48V
R
CL
*OPTIONAL.
GND
V+
LOAD
V
REG
D1*
OUT
2
3
4
5
6
8
C
OUT
C
GATE
R
25.5k
SS_SHDN
MAX5014
MAX5940A
D2*
Typical Operating Circuits
19-2991; Rev 0; 10/03
Pin Configurations appear at end of data sheet.
PART
TEMP RANGE
PIN-
PACKAGE
UVLO
MAX5940AESA
MAX5940BESA
°
C to +85
°
C
-40
°
C to +85
°
C
8 SO
8 SO
Fixed
Adjustable
Typical Operating Circuits continued at end of data sheet.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX5940AESA | IEEE 802.3af PD Interface Controller For Power-Over-Ethernet |
| MAX5940BESA | IEEE 802.3af PD Interface Controller For Power-Over-Ethernet |
| MAX5941B | IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices |
| MAX5941A | IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices |
| MAX5941 | IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5940BCSA+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5940BCSA+T | 制造商:Maxim Integrated Products 功能描述:IEEE 802.3AF PD INTERFACE CONTROLLER FOR POWER-OVER-ETHERNET - Tape and Reel |
| MAX5940BESA | 功能描述:輸入/輸出控制器接口集成電路 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 |
| MAX5940BESA+ | 功能描述:輸入/輸出控制器接口集成電路 IEEE 802.3af PD Int 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 |
| MAX5940BESA+T | 功能描述:輸入/輸出控制器接口集成電路 IEEE 802.3af PD Int 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 |
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