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參數(shù)資料
| 型號(hào)： | LTC4259ACGW#TR |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 1/32頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC CTRLR POE QUAD AC DISC 36SSOP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 控制器類型： | 以太網(wǎng)供電控制器（POE） |
| 接口： | I²C |
| 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(yīng)商設(shè)備封裝： | 36-SSOP |
| 包裝： | 帶卷 (TR) |
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LTC4259A
1
4259afb
■ 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 AC or DC Sensing
– Power Good Indication
■ Operates Autonomously or Controlled by I2C
TM
Serial Interface
■ 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 AC Disconnect
■ IEEE 802.3af Compliant Endpoint and Midspan
Power Sources
■ IP Phone Systems
■ DTE Power Distribution
The LTC
4259A is a quad –48V Hot SwapTM controller
designed 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 LTC4259A can implement a complete IEEE
802.3af-compliant PSE.
The LTC4259A can operate autonomously or be controlled
by an I2C serial interface. Up to 16 LTC4259As may coexist
on the same data bus, allowing up to 64 powered Ethernet
ports to be controlled with only two digital lines. Fault con-
ditions 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 LTC4259A 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
S1B
×4
CMPD3003
×4
10k
1k
×4
0.47
F
100V
×4
X7R
PORT1
PORT2
PORT3
PORT4
4259A F01
SMAJ58A
×4
0.1
F 100V
×4
OUT1 SENSE2 GATE2
LTC4259A
OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4
SHDN2 SHDN3 SHDN4
VDD
3.3V
0.1
F
AUTO BYP
OSCIN
RESET
0.1
F
100V X7R
0.1
F
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation. HotSwap is
a trademark of Linear Technology Corporation. All other trademarks are the property of
their respective owners.
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相關(guān)代理商/技術(shù)參數(shù) |
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| LTC4259AIGW-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad IEEE 802.3af Power over Ethernet Controller with AC Disconnect |
| LTC4259AIGW-1#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(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 供應(yīng)商設(shè)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 |
| LTC4259AIGW-1#TRPBF | 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(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 供應(yīng)商設(shè)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 |
| LTC4259CGW-ES | 制造商:LINEAR_TECH 功能描述: |
| LTC4260 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:UV, OV and Reverse Supply Protection Controller Low Operating Current: 125μA |
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