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LTC4268CDKD-1#TR PDF预览

LTC4268CDKD-1#TR

更新时间： 2024-09-15 18:00:15
品牌 Logo 应用领域
凌特 - Linear 开关光电二极管
页数 文件大小 规格书
48页 390K
描述
LTC4268-1 - High Power PD with Synchronous NoOpto Flyback Controller; Package: DFN; Pins: 32; Temperature Range: 0°C to 70°C

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中文翻译

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LTC4268CDKD-1#TR 技术参数

是否Rohs认证： 不符合生命周期：Transferred
零件包装代码：DFN包装说明：HVSON, SOLCC32,.16,16
针数：32Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.2模拟集成电路 - 其他类型：SWITCHING CONTROLLER
控制模式：CURRENT-MODE最大输入电压：19.5 V
最小输入电压：11 V标称输入电压：14 V
JESD-30 代码：R-PDSO-N32JESD-609代码：e0
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：70 °C最低工作温度：
最大输出电流：1.65 A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）：235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：250 kHz技术：CMOS
温度等级：COMMERCIAL端子面层：Tin/Lead (Sn/Pb)
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：20
宽度：4 mmBase Number Matches：1

LTC4268CDKD-1#TR 数据手册

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LTC4268-1  
High Power PD With  
Synchronous No-Opto  
Flyback Controller  
FEATURES  
DESCRIPTION  
The LTC®4268-1 is an integrated Powered Device (PD)  
controllerandswitchingregulatorintendedforIEEE802.3af  
and high power PoE applications up to 35W. By including  
a precision dual current limit, the LTC4268-1 keeps inrush  
below IEEE 802.3af current limit levels to ensure interop-  
erability success while enabling high power applications  
with a 750mA operational current limit.  
n
Robust 35W PD Front End  
n
IEEE 802.3af Compliant  
n
Rugged 750mA Power MOSFET With Precision Dual  
Level Current Limit  
n
High Performance Synchronous Flyback Controller  
n
IEEE Isolation Obtained Without an Optoisolator  
n
Adjustable Frequency from 50kHz to 250kHz  
n
Tight Multi-Output Regulation With Load  
The LTC4268-1 synchronous, current-mode, flyback  
controller generates multiple supply rails in a single  
conversion providing for the highest system efficiency  
while maintaining tight regulation across all outputs. The  
LTC4268-1includesLinearTechnology’spatentedNo-Opto  
feedback topology to provide full IEEE 802.3af isolation  
without the need of optoisolator circuitry.  
Compensation  
Onboard 25k Signature Resistor  
n
n
Programmable Classification Current to 75mA  
n
Complete Thermal and Over-Current Protection  
n
Available in Compact 32-Pin 7mm × 4mm DFN  
Package  
APPLICATIONS  
The oversized power path and high performance flyback  
controller of the LTC4268-1 combine to make the ultimate  
solutionforpowerhungryPoEapplicationssuchasWAPs,  
PTZ security cameras, RFID readers and ultra-efficient  
802.3af applications running near the 12.95W limit.  
n
VoIP Phones With Advanced Display Options  
n
Dual-Radio Wireless Access Points  
n
PTZ Security Cameras  
n
RFID Readers  
Industrial Controls  
n
The LTC4268-1 is available in a space saving 32-pin DFN  
package.  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Protected by U.S. Patents including 5841643.  
n
Magnetic Card Readers  
n
High Power PoE Systems  
TYPICAL APPLICATION  
35W High Efficiency PD Solution  
3.3V  
+
+
470μF  
×4  
•
≥5μF  
100pF  
56Ω  
28.7k  
1%  
BAS21  
20Ω  
T1  
47k  
47Ω  
•
T1  
SMAJ58A  
100k  
B0540W  
•
3.01k  
1%  
DF1501S  
FMMT618  
47μF  
Si4490DY  
Si7336ADP  
~ +  
–54V FROM  
DATA PAIR  
~ –  
FMMT718  
0.1μF  
+
V
PWRGD PWRGD UVLO I  
V
CC  
FB PG  
SENSE  
PORTP  
LIM_EN  
DF1501S  
~ +  
~ –  
1μF  
0.02Ω  
330Ω  
SHDN  
–54V FROM  
SPARE PAIR  
–
SENSE  
15Ω  
LTC4268-1  
R
CLASS  
SG  
2.2nF  
0.1μF  
10nF  
20k  
V
CMP  
T2  
V
V
NEG  
PGDLY  
t
SYNC  
R
ENDLY  
OSC GND SFST C  
CMP  
PORTN  
ON  
CMP  
•
•
R
10k  
12k  
169k  
100k  
47pF  
CLASS  
BAT54  
T1: PA1477NL  
T2: PA0184  
42681 TA01a  
0.033μF  
42681fb  
1
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中文翻译

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