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參數(shù)資料
| 型號： | LTC4267CGN-1 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 240 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 2/32頁 |
| 文件大?。?/td> | 925K |
| 代理商： | LTC4267CGN-1 |
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LTC4267-1
10
42671f
avoid corrupting the 25k signature resistor while also sav-
ing board space and cost. In addition, the inrush current
limit requirement of the IEEE 802.3af standard can cause
large transient power dissipation in the PD. The LTC4267-1
is designed to allow multiple turn-on sequences without
overheating the miniature 16-lead package. In the event of
excessive power cycling, the LTC4267-1 provides thermal
overload protection to keep the onboard power MOSFET
within its safe operating area.
OPERATION
The LTC4267-1 PD interface has several modes of opera-
tion depending on the applied input voltage as shown in
Figure 1 and summarized in Table 1. These modes satisfy
the requirements dened in the IEEE 802.3af specication.
The input voltage is applied to the VPORTN pin and must
be negative relative to the VPORTP pin. Voltages in the data
sheet for the PD interface portion of the LTC4267-1 are
with respect to VPORTP while the voltages for the switch-
ing regulator are referenced to PGND. It is assumed that
PGND is tied to POUT. Note the use of different ground
symbols throughout the data sheet.
Table 1. LTC4267-1 Operational Mode
as a Function of Input Voltage
INPUT VOLTAGE
(VPORTN with RESPECT to VPORTP) LTC4267-1 MODE OF OPERATION
0V to – 1.4V
Inactive
–1.5V to –9.5V**
25k Signature Resistor Detection
–9.8V to –12.4V
Classication Load Current Ramps up
from 0% to 100%
–12.5V to UVLO*
Classication Load Current Active
UVLO* to –57V
Power Applied to Switching Regulator
*VPORTN UVLO includes hysteresis.
Rising input threshold
–36.0V
Falling input threshold
–30.5V
**Measured at LTC4267-1 pin. The LTC4267-1 meets the IEEE 802.3af 10V
minimum when operating with the required diode bridges.
APPLICATIO S I FOR ATIO
WU
UU
Figure 1. Output Voltage,
PWRGD and PD
Current as a Function of Input Voltage
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| LTC4267CGN-1#PBF | 功能描述:IC POE 802.3AF INTERFACE 16SSOP 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 |
| LTC4267CGN-1#TRPBF | 功能描述:IC POE 802.3AF INTERFACE 16SSOP 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 |
| LTC4267CGN-1-PBF | 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 |
| LTC4267CGN-1-TR | 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 |
| LTC4267CGN-1-TRPBF | 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 |
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