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LT3477IFE PDF预览

LT3477IFE

更新时间: 2024-11-07 05:43:31
品牌 Logo 应用领域
凌特 - Linear 转换器稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数 文件大小 规格书
20页 265K
描述
3A, DC/DC Converter with Dual Rail-to-Rail Current Sense

LT3477IFE 技术参数

是否Rohs认证: 不符合生命周期:Transferred
零件包装代码:TSSOP包装说明:HTSSOP, TSSOP20,.25
针数:20Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.17Is Samacsys:N
模拟集成电路 - 其他类型:SWITCHING REGULATOR控制模式:CURRENT-MODE
控制技术:PULSE WIDTH MODULATION最大输入电压:25 V
最小输入电压:2.5 V标称输入电压:2.5 V
JESD-30 代码:R-PDSO-G20JESD-609代码:e0
长度:6.5 mm湿度敏感等级:1
功能数量:1端子数量:20
最高工作温度:125 °C最低工作温度:-40 °C
最大输出电流:5 A封装主体材料:PLASTIC/EPOXY
封装代码:HTSSOP封装等效代码:TSSOP20,.25
封装形状:RECTANGULAR封装形式:SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
峰值回流温度(摄氏度):235认证状态:Not Qualified
座面最大高度:1.2 mm子类别:Switching Regulator or Controllers
表面贴装:YES切换器配置:BUCK-BOOST
最大切换频率:4300 kHz温度等级:AUTOMOTIVE
端子面层:Tin/Lead (Sn/Pb)端子形式:GULL WING
端子节距:0.65 mm端子位置:DUAL
处于峰值回流温度下的最长时间:20宽度:4.4 mm
Base Number Matches:1

LT3477IFE 数据手册

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LT3477  
3A, DC/DC Converter  
with Dual Rail-to-Rail  
Current Sense  
U
FEATURES  
DESCRIPTIO  
The LT®3477 is a current mode, 3A DC/DC step-up con-  
verter with dual rail-to-rail current sense amplifiers and an  
internal 3A, 42V switch. It combines a traditional voltage  
feedback loop and two unique current feedback loops to  
operate as a constant-current, constant-voltage source.  
Dual 100mV Rail-to-Rail Current Sense Amplifiers  
Wide Input Voltage Range: 2.5V to 25V  
3A, 42V Internal Switch  
High Efficiency Power Conversion: Up to 93%  
Drives LEDs in Boost, Buck-Boost or Buck Mode  
Frequency Set by External Resistor: 200kHz to 3.5MHz Both current sense voltages are set at 100mV and can be  
Programmable Soft-Start  
adjusted independently using the IADJ1 and IADJ2 pins.  
Efficiency of up to 91% can be achieved in typical applica-  
tions.TheLT3477featuresaprogrammablesoft-startfunc-  
tion to limit inductor current during start-up. Both inputs  
oftheerroramplifierareavailableexternallyallowingposi-  
tiveandnegativeoutputvoltages(Boost,Inverting,SEPIC,  
Flyback). The switching frequency is programmable from  
200kHz to 3.5MHz through an external resistor.  
Low VCESAT Switch: 0.3V at 2.5A  
Capable of Positive and Negative Output Voltages  
(Boost, Inverting, SEPIC, Flyback)  
Available in Thermally Enhanced 20-Lead  
(4mm × 4mm) QUFN and 20-Lead TSSOP Packages  
APPLICATIO S  
Available in thermally enhanced 20-pin (4mm × 4mm)  
QFN and 20-pin TSSOP packages, the LT3477 provides a  
complete solution for both constant-voltage and con-  
stant-current applications.  
High Power LED Driver  
DSL Modems  
Distributed Power  
Input/Output Current Limited Boost, SEPIC,  
Inverting, Flyback Converters  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Constant-Voltage, Constant-Current Source  
U
TYPICAL APPLICATIO  
330mA LED Driver with Open LED Protection  
Efficiency  
10µH  
V
IN  
90  
85  
80  
75  
70  
65  
60  
55  
5V  
3.3µF  
3.3µF  
200k  
10k  
I
I
SW  
SP1  
SN1  
V
FBN  
IN  
I
I
ADJ1  
ADJ2  
LT3477  
SHDN  
SHDN  
I
SP2  
0.3  
V
V
I
C
SN2  
R
REF  
T
FBP  
GND  
SS  
1k  
330mA  
50  
22k  
0.2  
(A)  
0
0.1  
0.3  
0.4  
33nF  
4.7nF  
I
OUT  
3477 TA01b  
3477 TA01a  
3477fb  
1

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