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参数资料
| 型号： | LTC4257CS8-1#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | IEEE 802.3af PD Power over Ethernet Interface Controller; Package: SO; No of Pins: 8; Temperature Range: 0°C to +70°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | 0.150 INCH, LEAD FREE, PLASTIC, SO-8 |
| 文件页数： | 12/20页 |
| 文件大小： | 265K |
| 代理商： | LTC4257CS8-1#PBF |
LTC4257-1
2
42571fb
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN
Supply Voltage
Voltage with Respect to GND Pin (Notes 4, 5, 6)
Maximum Operating Voltage
●
–57
V
Signature Range
●
– 1.5
– 9.5
V
Classification Range
● –12.5
– 21
V
UVLO Turn-On Voltage
● –34.8
–36.0
– 37.2
V
UVLO Turn-Off Voltage
● –29.3
–30.5
– 31.5
V
IIN_ON
IC Supply Current when ON
VIN = – 48V, Pins 5, 6, 7 Floating
●
3mA
IIN_CLASS
IC Supply Current During Classification VIN = – 17.5V, Pins 2, 7 Floating, VOUT Tied to GND
●
0.35
0.50
0.65
mA
(Note 7)
ICLASS
Current Accuracy During Classification 10mA < ICLASS < 40mA, – 12.5V ≤ VIN ≤ – 21V,
●
±3.5
%
(Notes 8, 9)
RSIGNATURE
Signature Resistance
–1.5V
≤ VIN ≤ –9.5V, VOUT Tied to GND,
● 23.25
26.00
k
IEEE 802.3af 2-Point Measurement (Notes 4, 5)
RINVALID
Invalid Signature Resistance
– 1.5V
≤ VIN ≤ –9.5V, SIGDISA and VOUT
●
9
11.8
k
Tied to GND, IEEE 802.3af 2-Point Measurement
(Notes 4, 5)
(Notes 1, 2)
VIN Voltage ............................................. 0.3V to – 100V
VOUT, SIGDISA,
PWRGD Voltage ...................... VIN + 100V to VIN – 0.3V
RCLASS Voltage ............................ VIN + 7V to VIN – 0.3V
PWRGD Current .................................................. 10mA
RCLASS Current .................................................. 100mA
The
● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
ABSOLUTE
AXI U
RATI GS
W
WW
U
ELECTRICAL CHARACTERISTICS
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grades are identified by a label on the shipping container.
PACKAGE/ORDER I FOR ATIO
UU
W
Operating Ambient Temperature Range
LTC4257C-1 ............................................ 0
°C to 70°C
LTC4257I-1 ......................................... –40
°C to 85°C
Storage Temperature Range
S8 Package ....................................... – 65
°C to 150°C
DD Package ...................................... – 65
°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300
°C
ORDER PART NUMBER
1
2
3
4
8
7
6
5
TOP VIEW
GND
SIGDISA
PWRGD
VOUT
NC
RCLASS
NC
VIN
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/W
TOP VIEW
DD PACKAGE
8-LEAD (3mm
× 3mm) PLASTIC DFN
5
6
7
8
4
3
2
1
NC
RCLASS
NC
VIN
GND
SIGDISA
PWRGD
VOUT
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD TO BE SOLDERED TO ELECTRICALLY ISOLATED PCB HEATSINK
S8 PART MARKING
42571
4257I1
LTC4257CS8-1
LTC4257IS8-1
ORDER PART NUMBER
DD PART MARKING*
LBFZ
LTC4257CDD-1
LTC4257IDD-1
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF
Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4257CS8-1#TRPBF | IEEE 802.3af PD Power over Ethernet Interface Controller; Package: SO; No of Pins: 8; Temperature Range: 0°C to +70°C |
| LTC4257IDD-1#PBF | IEEE 802.3af PD Power over Ethernet Interface Controller; Package: DFN; No of Pins: 8; Temperature Range: -40°C to +85°C |
| LTC4257IDD-1#TRPBF | IEEE 802.3af PD Power over Ethernet Interface Controller; Package: DFN; No of Pins: 8; Temperature Range: -40°C to +85°C |
| LTC4257IS8-1#PBF | IEEE 802.3af PD Power over Ethernet Interface Controller; Package: SO; No of Pins: 8; Temperature Range: -40°C to +85°C |
| LTC4257IS8-1#TRPBF | IEEE 802.3af PD Power over Ethernet Interface Controller; Package: SO; No of Pins: 8; Temperature Range: -40°C to +85°C |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4257IDD | 功能描述:IC CONTROLLER POE INTERFACE 8DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4257IDD#PBF | 功能描述:IC CONTROLLER POE INTERFACE 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4257IDD#TR | 功能描述:IC CONTROLLER POE INTERFACE 8DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4257IDD#TRPBF | 功能描述:IC CONTROLLER POE INTERFACE 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4257IDD-1 | 功能描述:IC CONTROLLER POE INTERFACE 8DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
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