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LTC4278

更新时间： 2024-01-11 04:44:37
品牌 Logo 应用领域
凌特 - Linear 光电光电二极管控制器
页数 文件大小 规格书
40页 393K
描述
IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support

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LTC4278 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：DFN包装说明：HVSON, SOLCC32,.16,16
针数：32Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.18模拟集成电路 - 其他类型：SWITCHING CONTROLLER
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：20 V最小输入电压：4.5 V
标称输入电压：14 VJESD-30 代码：R-PDSO-N32
JESD-609代码：e3长度：7 mm
湿度敏感等级：1功能数量：1
端子数量：32最高工作温度：85 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：HVSON封装等效代码：SOLCC32,.16,16
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：0.8 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：SINGLE
最大切换频率：110 kHz技术：CMOS
温度等级：INDUSTRIAL端子面层：Matte Tin (Sn)
端子形式：NO LEAD端子节距：0.4 mm
端子位置：DUAL处于峰值回流温度下的最长时间：30
宽度：4 mmBase Number Matches：1

LTC4278 数据手册

 浏览型号LTC4278的Datasheet PDF文件第2页浏览型号LTC4278的Datasheet PDF文件第3页浏览型号LTC4278的Datasheet PDF文件第4页浏览型号LTC4278的Datasheet PDF文件第5页浏览型号LTC4278的Datasheet PDF文件第6页浏览型号LTC4278的Datasheet PDF文件第7页 
LTC4278  
IEEE 802.3at PD with  
Synchronous No-Opto Flyback  
Controller and 12V Aux Support  
DESCRIPTION  
FEATURES  
The LTC®4278 is an integrated Powered Device (PD)  
controllerandswitchingregulatorintendedforhighpower  
n
25.5W IEEE 802.3at Compliant (Type 2) PD  
10V to 57V Auxiliary Power Input  
n
n
Shutdown Pin for Flexible Auxiliary Power Support  
Integrated State-of-the-Art No-Opto Synchronous  
Flyback Controller  
IEEE 802.3at and 802.3af applications. With a wide input  
voltagerange,theLTC4278isspecificallydesignedtosup-  
port PD applications that include a low-voltage auxiliary  
power input such as a 12V wall adaptor. The inclusion of  
a shutdown pin provides simple implementation of both  
PoE and auxiliary dominate applications. In addition, the  
LTC4278supportsboth1-eventand2-eventclassifications  
as defined by the IEEE, thereby allowing the use in a wide  
range of product configurations.  
n
– Isolated Power Supply Efficiency >92%  
– 88% Efficiency Including Diode Bridge and  
Hot Swap™ FET  
n
n
n
n
Superior EMI Performance  
Robust 100V 0.7Ω (Typ) Integrated Hot Swap MOSFET  
IEEE 802.3at High Power Available Indicator  
Integrated Signature Resistor and Programmable  
Class Current  
Undervoltage, Overvoltage and Thermal Protection  
Short-Circuit Protection with Auto-Restart  
Programmable Soft-Start and Switching Frequency  
Complementary Power Good Indicators  
Thermally Enhanced 7mm × 4mm DFN Package  
TheLTC4278synchronous,currentmode,flybackcontrol-  
ler generates multiple supply rails in a single conversion  
stepprovidingforthehighestsystemefficiencywhilemain-  
taining tight regulation across all outputs. The LTC4278  
includes Linear Technology’s patented No-Opto feedback  
topology to provide full IEEE 802.3 isolation without the  
need of an opto-isolator circuit. A true soft-start function  
allows graceful ramp-up of all output voltages.  
n
n
n
n
n
APPLICATIONS  
The LTC4278 is available in a space saving 32-pin DFN  
package.  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation.  
All other trademarks are the property of their respective owners. Protected by U.S. Patents,  
including 5841643.  
n
VoIP Phones with Advanced Display Options  
n
Dual-Radio Wireless Access Points  
n
PTZ Security Cameras  
RFID Readers  
Industrial Controls  
n
n
EPC3472G-LF  
TYPICAL APPLICATION  
25W PD Solution with 12V Auxiliary  
•
0.18μH  
47μF  
5V  
5A  
2.2μH  
+
+
•
+
100μF  
AUXILIARY  
•
10μF  
10μF  
100k  
SUPPLY  
(10V TO 57V)  
–
294k  
21.5k  
3.01k  
BSS63LT1  
1μF  
680k  
TO MICRO  
CONTROLLER  
HAT2169  
41.2k  
FDMS2572  
12mΩ  
~ +  
~ –  
54V FROM  
DATA PAIR  
PDS5100H  
+
–
FB  
V
PG SENSE  
UVLO PWRGD T2P  
PORTP  
SHDN  
CC  
V
SENSE  
R
CLASS  
LTC4278  
0.1μF  
24k  
30.9ꢀ  
~ +  
~ –  
SG  
CMP  
54V FROM  
SPARE PAIR  
2.2nF  
V
V
1μF  
PORTN  
NEG  
V
SYNC GND OSC PGDLY  
10k  
t
ENDLY  
100k  
R
C
CMP  
ON  
CMP  
•
•
38.3k 1.8k  
33pF  
0.1μF  
4278 TA01a  
4278f  
1
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