參數資料
| 型號： | LTC4258CGW#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數： | 1/28頁 |
| 文件大小： | 0K |
| 描述： | IC POE 802.3AF QUAD 36-SSOP |
| 標準包裝： | 1,000 |
| 控制器類型： | 以太網供電控制器（POE） |
| 接口： | IEEE 802.3af |
| 電源電壓： | 3 V ~ 4 V |
| 電流 - 電源： | 2.5mA |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 36-BSOP（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 36-SSOP |
| 包裝： | 帶卷 (TR) |
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LTC4258
1
4258fb
■ Controls Four Independent – 48V Powered
Ethernet Ports
■ 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
■ Operates Autonomously or by I2C
TM Control
■
4-Bit Programmable Digital Address Allows Control
of Up to 64 Ports
■ Programmable INT Pin Eliminates Software Polling
■
Current and Duty Cycle Limits Protect External FETs
■ Available in a 36-Pin SSOP Package
Quad IEEE 802.3af
Power over Ethernet Controller
with Integrated Detection
■ IEEE 802.3af Compliant Endpoint and Midspan
Power Sources
■ IP Phone Systems
■ DTE Power Distribution
The LTC
4258 is a quad –48V Hot SwapTM 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
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 I2C 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, LTC4257-1, and LTC4267.
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
VEE
SHDN1
SENSE1
RS1
RS2
RS3
RS4
GATE1
Q1
Q2
Q3
Q4
CMPD3003
×4
10k
PORT1
PORT2
PORT3
PORT4
4258 F01
SMAJ58A
×4
0.1
F 100V
×4
OUT1 SENSE2 GATE2
LTC4258
OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4
SHDN2 SHDN3 SHDN4
VDD
3.3V
0.1
F
AUTO BYP
RESET
0.1
F
100V X7R
0.1
F
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Hot Swap is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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| 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 |
| LTC4259ACGW | 功能描述:IC CTRLR POE QUAD AC DISC 36SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 控制器 系列:- 標準包裝: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 供應商設備封裝:24-HVQFN（4x4） 包裝:托盤 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱:935286452157SC18IS600IBSSC18IS600IBS-ND |
| LTC4259ACGW#PBF | 功能描述:IC CTRLR POE QUAD AC DISC 36SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 控制器 系列:- 標準包裝: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 供應商設備封裝:24-HVQFN（4x4） 包裝:托盤 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱:935286452157SC18IS600IBSSC18IS600IBS-ND |
| LTC4259ACGW#TR | 功能描述:IC CTRLR POE QUAD AC DISC 36SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 控制器 系列:- 標準包裝: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 供應商設備封裝:24-HVQFN（4x4） 包裝:托盤 配用:568-3511-ND - DEMO BOARD SPI TO I2C 其它名稱:935286452157SC18IS600IBSSC18IS600IBS-ND |
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