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參數(shù)資料
| 型號(hào)： | LTC4258CGW |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Quad IEEE 802.3af Power over Ethernet Controller with Integrated Detection |
| 中文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO36 |
| 封裝： | 0.300 INCH, PLASTIC, SSOP-36 |
| 文件頁(yè)數(shù)： | 1/28頁(yè) |
| 文件大小： | 297K |
| 代理商： | LTC4258CGW |
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LTC4258
1
4258p
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation. 802 is a registered trademark of
Instutute of Electrical and Electronics Engineers, Inc. I
2
C is a trademark of Philips Electronics N.V.
I
Controls Four Independent –48V Powered
Ethernet Ports
I
Each Port Includes:
– IEEE 802
.3af Compliant
PD Detection and
Classification
– Output Current Limit with Foldback
– Short-Circuit Protection with Fast Gate Pull-Down
– PD Disconnect Using DC Sensing
– Power Good Indication
I
Operates Autonomously or Controlled by I
2
C
TM
Serial Interface
I
4-Bit Programmable Digital Address Allows Control
of Up to 64 Ports
I
Programmable INT Pin Eliminates Software Polling
I
Current and Duty Cycle Limits Protect External FETs
APPLICATIU
Quad IEEE 802.3af
Power over Ethernet Controller
with Integrated Detection
I
IEEE 802.3af Compliant Endpoint and Midspan
Power Sources
I
IP Phone Systems
I
DTE Power Distribution
The LTC
4258 is a quad –48V Hot Swap
TM
controller de-
signed for use in IEEE 802.3af compliant Power
Sourcing Equipment (PSE). It consists of four independent
ports, each with output current limit, short-circuit protec-
tion, complete Powered Device (PD) detection and classi-
fication capability, and programmable PD disconnect using
AC or DC sensing. Used with power MOSFETs and passives
as in Figure 1, the LTC4258 can implement a complete IEEE
802.3af-compliant PSE.
The LTC4258 can operate autonomously or be controlled by
an I
2
C serial interface. Up to 16 LTC4258s 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 optionally signaled with the INT pin to eliminate software
polling.
External power MOSFETs, current sense resistors and di-
odes allow easy scaling of current and power dissipation
levels and provide protection against voltage and current
spikes and ESD events.
The LTC4258 is available in a 36-pin SSOP package.
Linear Technology also provides solutions for 802.3af PD
applications with the LTC4257 and LTC4257-1.
Figure 1. Complete 4-Port Powered Ethernet Power Source
DGND
AD3
RS1 TO RS4: 0.5
Q1 TO Q4: IRFM120A
AD2
AD1
AD0
SDAOUT
SDAIN
SCL
DETECT4
DETECT3
DETECT1
DETECT2
AGND
INT
–48V
V
EE
SHDN1
SENSE1
R
S1
R
S2
R
S3
R
S4
GATE1
Q1
Q2
Q3
Q4
CMPD3003
×
4
10k
10k
10k
10k
OUT1
OUT2
OUT3
OUT4
4258 F01
SMAJ58A
×
4
0.1
μ
F 100V
×
4
OUT1 SENSE2 GATE2
LTC4258
OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4
SHDN2SHDN3SHDN4
V
DD
3.3V
0.1
μ
F
AUTO BYP
RESET
0.1
μ
F
100V X7R
0.1
μ
F
FEATURES
DESCRIPTIOU
TYPICAL APPLICATIO
U
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 |
|---|---|
| LTC4258CGW#PBF | 功能描述:IC POE 802.3AF QUAD 36-SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:2,450 系列:- 控制器類型:SPI 總線至 I²C 總線橋接 接口:I²C，串行，SPI 電源電壓:2.4 V ~ 3.6 V 電流 - 電源:11mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤(pán) 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱:935286452157SC18IS600IBSSC18IS600IBS-ND |
| LTC4258CGW#TR | 制造商:Linear Technology 功能描述:POWER OVER ETHERNET CONTROLLER |
| LTC4258CGW#TRPBF | 功能描述:IC POE 802.3AF QUAD 36-SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:2,450 系列:- 控制器類型:SPI 總線至 I²C 總線橋接 接口:I²C，串行，SPI 電源電壓:2.4 V ~ 3.6 V 電流 - 電源:11mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-HVQFN（4x4） 包裝:托盤(pán) 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱:935286452157SC18IS600IBSSC18IS600IBS-ND |
| LTC4259A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator |
| LTC4259A-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Synchronous No-Opto Flyback Controller |
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