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參數(shù)資料
| 型號： | LTC4259ACGW |
| 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 AC Disconnect |
| 中文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO36 |
| 封裝： | 0.300 INCH, PLASTIC, SSOP-36 |
| 文件頁數(shù)： | 1/32頁 |
| 文件大小： | 326K |
| 代理商： | LTC4259ACGW |
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LTC4259A
1
4259Af
, 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 AC or 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
I
Available in a 36-Pin SSOP Package
APPLICATIU
Quad IEEE 802.3af
Power over Ethernet Controller
with AC Disconnect
DESCRIPTIOU
I
IEEE 802.3af Compliant Endpoint and Midspan
Power Sources
I
IP Phone Systems
I
DTE Power Distribution
The LTC
4259A is a quad –48V Hot Swap
TM
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 I
2
C 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 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
S1B
×
4
CMPD3003
×
4
10k
10k
10k
10k
1k
×
4
0.47
μ
F
100V
×
4
X7R
PORT1
PORT2
PORT3
PORT4
4259A F01
SMAJ58A
×
4
0.1
μ
F 100V
×
4
OUT1 SENSE2 GATE2
LTC4259A
OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4
SHDN2SHDN3SHDN4
V
DD
3.3V
0.1
μ
F
AUTO BYP
OSCIN
RESET
0.1
μ
F
100V X7R
0.1
μ
F
FEATURES
TYPICAL APPLICATIO
U
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(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 |
| 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(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 |
| LTC4259ACGW#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 |
| LTC4259ACGW-1 | 制造商:Linear Technology 功能描述:QUAD IEEE 802.3AF POWER OVER ETHERNET CONTROLLER WITH AC DISCONNECT |
| LTC4259ACGW-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 |
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