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参数资料
| 型号： | LTC4274AIUHF-4#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PQCC38 |
| 封装： | 7 X 5 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38 |
| 文件页数： | 5/28页 |
| 文件大小： | 313K |
| 代理商： | LTC4274AIUHF-4#TRPBF |
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LTC4274A/LTC4274C
13
4274acf
pin Functions
RESET: Chip Reset, Active Low. When the RESET pin is
low, the LTC4274A/LTC4274C is held inactive with the port
off and all internal registers reset to their power-up states.
When RESET is pulled high, the LTC4274A/LTC4274C
begins normal operation. RESET can be connected to
an external capacitor or RC network to provide a power
turn-on delay. Internal filtering of the RESET pin prevents
glitches less than 1s wide from resetting the LTC4274A/
LTC4274C. Internally pulled up to VDD.
MID: Midspan Mode Input. When high, the LTC4274A/
LTC4274C acts as a midspan device. Internally pulled
down to DGND.
INT: Interrupt Output, Open Drain. INT will pull low when
anyoneofseveraleventsoccurintheLTC4274A/LTC4274C.
It will return to a high impedance state when bits 6 or 7
are set in the Reset PB register (1Ah). The INT signal can
be used to generate an interrupt to the host processor,
eliminating the need for continuous software polling.
Individual INT events can be disabled using the Int Mask
register (01h). See the LTC4274A/LTC4274C Software
Programming documentation for more information. The
INT pin is only updated between I2C transactions.
SCL:SerialClockInput.Highimpedanceclockinputforthe
I2C serial interface bus. SCL must be tied high if not used.
SDAOUT: Serial Data Output, Open Drain Data Output for
the I2C Serial Interface Bus. The LTC4274A/LTC4274C
uses two pins to implement the bidirectional SDA function
to simplify optoisolation of the I2C bus. To implement a
standard bidirectional SDA pin, tie SDAOUT and SDAIN
together. SDAOUT should be grounded or left floating if
not used. See the Applications Information section for
more information.
SDAIN: Serial Data Input. High impedance data input for
the I2C serial interface bus. The LTC4274A/LTC4274C
uses two pins to implement the bidirectional SDA function
to simplify optoisolation of the I2C bus. To implement a
standard bidirectional SDA pin, tie SDAOUT and SDAIN
together. SDAIN must be tied high if not used. See the
Applications Information section for more information.
AD3: Address Bit 3. Tie the address pins high or low to set
the I2C serial address to which the LTC4274A/LTC4274C
responds. This address will be 010A3A2A1A0b. Internally
pulled up to VDD.
AD2: Address Bit 2. See AD3.
AD1: Address Bit 1. See AD3.
AD0: Address Bit 0. See AD3.
NC, DNC: All pins identified with “NC” or “DNC” must be
left unconnected.
DGND: Digital Ground. DGND is the return for the VDD
supply.
VDD: Logic Power Supply. Connect to a 3.3V power supply
relative to DGND. VDD must be bypassed to DGND near
the LTC4274A/LTC4274C with at least a 0.1F capacitor.
SHDN: Shutdown, Active Low. When pulled low, SHDN
shuts down the port, regardless of the state of the internal
registers. Pulling SHDN low is equivalent to setting the
Reset Port bit in the Reset Pushbutton register (1Ah).
Internal filtering of the SHDN pin prevents glitches less
than 1s wide from resetting the port. Internally pulled
up to VDD.
AGND: Analog Ground. AGND is the return for the VEE
supply.
SENSE: Current Sense Input. SENSE monitors the exter-
nal MOSFET current via a 0.5 or 0.25Ω sense resistor
between SENSE and VEE. Whenever the voltage across
the sense resistor exceeds the overcurrent detection
threshold VCUT, the current limit fault timer counts up. If
the voltage across the sense resistor reaches the current
limit threshold VLIM, the GATE pin voltage is lowered to
maintain constant current in the external MOSFET. See
the Applications Information section for further details.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4274C | 制造商:LINER 制造商全称:Linear Technology 功能描述:12-Port PoE/PoE+/LTPoE++ PSE Controller |
| LTC4274CIUHF#PBF | 功能描述:IC CONTROLLER POE 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC4274CIUHF#TRPBF | 功能描述:IC CONTROLLER POE 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC4274CUHF#PBF | 功能描述:IC CONTROLLER POE 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC4274CUHF#TRPBF | 制造商:Linear Technology 功能描述:POE Controller 25.5W 38-Pin QFN EP |
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