參數(shù)資料
型號(hào)： LTC4259CGW
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO36
封裝： 0.300 INCH, PLASTIC, SSOP-36
文件頁(yè)數(shù)： 1/32頁(yè)
文件大小： 324K
代理商： LTC4259CGW
LTC4259
1
4259i
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Controls Four Independent – 48V Powered
Ethernet Ports
s
Each Channel Includes:
– IEEE 802
.3af Compliant PD Detection and
Classification
– Inrush Control
– Short-Circuit Protection with Current Foldback
– PD Disconnect Using AC or DC Sensing
– Power Good Indication
s
Operates Autonomously or Controlled by I2C
TM
Serial Interface
s
4-Bit Programmable Digital Address Allows Control
of Up to 64 Channels
s
Programmable INT Pin Eliminates Software Polling
s
Current Limit Duty Cycle Protects External FETs
Quad IEEE 802.3af
Power over Ethernet Controller
with AC Disconnect
August 2003
s
IP Phone Systems
s
DTE Power Distribution
s
IEEE 802.3af Compliant Systems
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
The LTC
4259 is a quad – 48V Hot SwapTM controller de-
signed for use in IEEE 802.3af compliant Power Sourc-
ing Equipment (PSE). It consists of four independent
channels, each with inrush control, short-circuit protection,
complete powered device (PD) detection and classification
capability, and programmable PD disconnect using AC or
DC sensing. Used with power MOSFETs and passives, as
in Figure 1, the LTC4259 can implement a complete IEEE
802.3af compliant PSE.
The LTC4259 can operate autonomously or be controlled by
an I2C serial interface. Up to 16 LTC4259s may coexist on
the same data bus, allowing up to 64 powered Ethernet ports
to be controlled with only two digital lines. Fault conditions
are signaled with the INT pin to eliminate software polling.
External power switches, current sense resistors and diodes
allow easy scaling of current and power dissipation levels
and provide protection against voltage and current spikes
and ESD events.
The LTC4259 is available in a 36-pin SSOP package.
Linear Technology also provides solutions for 802.3af
powered device (PD) applications with the LTC4257.
Hot Swap is a trademark of Linear Technology Corporation. 802 is a registered trademark of
Instutute of Electrical and Electronics Engineers, Inc. I2C is a trademark of Philips Electronics N.V.
Figure 1. Complete 4-Port Powered Ethernet Power Source
DGND
AD3
RS1 TO RS4: TWO 1
, 1% RESISTORS IN PARALLEL
Q1 TO Q4: IRFM120A
AD2
AD1
AD0
SDAOUT
SDAIN
SCL
DETECT4
DETECT3
DETECT1
DETECT2
AGND
INT
–48V
VEE
SHDN1
SENSE1
RS1
RS2
RS3
RS4
GATE1
Q1
Q2
Q3
Q4
S1B
×4
BAV19WS
×4
10k
1k
×4
0.22
F
100V
×4
OUT1
OUT2
OUT3
OUT4
4259 F01
SMAJ58A
×4
0.1
F 100V
×4
OUT1 SENSE2 GATE2
LTC4259
OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4
SHDN2 SHDN3 SHDN4
VDD
3.3V
0.1
F
AUTO
OSCIN
AUXIN
RESET DCDISEN
Electrical Specifications Subject to Change
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC4260CGN#PBF 功能描述:IC CTLR HOT SWAP I2C 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開(kāi)關(guān):無(wú) 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤(pán) 產(chǎn)品目錄頁(yè)面:1423 (CN2011-ZH PDF)
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