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LTC3851EGN#PBF PDF预览

LTC3851EGN#PBF

更新时间： 2024-11-07 19:56:47
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
28页 327K
描述
LTC3851 - Synchronous Step-Down Switching Regulator Controller; Package: SSOP; Pins: 16; Temperature Range: -40°C to 85°C

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LTC3851EGN#PBF 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：SSOP包装说明：SSOP, SSOP16,.25
针数：16Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：2.89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：38 V最小输入电压：4 V
标称输入电压：15 VJESD-30 代码：R-PDSO-G16
JESD-609代码：e3长度：4.88 mm
湿度敏感等级：1功能数量：1
端子数量：16最高工作温度：85 °C
最低工作温度：最大输出电流：0.05 A
最大输出电压：5.5 V最小输出电压：0.8 V
封装主体材料：PLASTIC/EPOXY封装代码：SSOP
封装等效代码：SSOP16,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, SHRINK PITCH峰值回流温度（摄氏度）：260
认证状态：Not Qualified座面最大高度：1.75 mm
子类别：Switching Regulator or Controllers表面贴装：YES
切换器配置：PUSH-PULL最大切换频率：790 kHz
技术：CMOS温度等级：OTHER
端子面层：Matte Tin (Sn)端子形式：GULL WING
端子节距：0.635 mm端子位置：DUAL
处于峰值回流温度下的最长时间：30宽度：3.899 mm
Base Number Matches：1

LTC3851EGN#PBF 数据手册

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LTC3851  
Synchronous  
Step-Down Switching  
Regulator Controller  
FEATURES  
DESCRIPTION  
The LTC®3851 is a high performance synchronous  
step-down switching regulator controller that drives  
an all N-channel synchronous power MOSFET stage. A  
n
Wide V Range: 4V to 38V Operation  
SENSE  
±±1 Output Voltage Accuracy  
IN  
n
R
or DCR Current Sensing  
n
n
n
n
n
n
n
n
n
n
Phase-Lockable Fixed Frequency: 250kHz to 750kHz constant frequency current mode architecture allows a  
Dual N-Channel MOSFET Synchronous Drive  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start or Tracking  
Output Current Foldback Limiting  
phase-lockable frequency of up to 750kHz.  
OPTI-LOOP compensation allows the transient response  
to be optimized over a wide range of output capacitance  
and ESR values. The LTC3851 features a precision 0.8V  
reference that is compatible with a wide 4V to 38V input  
supply range.  
Output Overvoltage Protection  
5V Internal Regulator  
OPTI-LOOP® Compensation Minimizes C  
OUT  
The TK/SS pin ramps the output voltage during start-up.  
Current foldback limits MOSFET heat dissipation during  
short-circuit conditions. The MODE/PLLIN pin selects  
among Burst Mode operation, pulse skipping mode or  
continuousinductorcurrentmodeatlightloadsandallows  
the IC to be synchronized to an external clock.  
Selectable Continuous, Pulse-Skipping or  
Burst Mode® Operation at Light Loads  
n
n
n
Low Shutdown I : 20μA  
Q
V
Range: 0.8V to 5.5V  
OUT  
Thermally Enhanced 16-Lead MSOP, 16-Lead Narrow  
SSOP or 3mm × 3mm QFN Package  
The LTC3851-1 is a version with a power good output  
signal instead of adjustable current limit.  
L, LT, LTC, LTM, Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology  
Corporation. All other trademarks are the property of their respective owners. Protected by  
U.S. Patents including 5408150, 5481178, 5705919, 5929620, 6304066, 6498466, 6580258,  
6611131.  
APPLICATIONS  
n
Automotive Systems  
n
Telecom Systems  
Industrial Equipment  
n
n
Distributed DC Power Systems  
TYPICAL APPLICATION  
High Efficiency Synchronous Step-Down Converter  
Efficiency and Power Loss  
vs Load Current  
V
IN  
4.5V TO 36V  
I
V
IN  
LIM  
100  
95  
10000  
1000  
100  
22μF  
V
V
= 12V  
IN  
OUT  
FREQ/PLLFLTR TG  
= 3.3V  
0.68μH  
3.01k  
V
OUT  
0.1μF  
82.5k  
RUN  
SW  
3.3V  
15A  
90  
LTC3851  
0.1μF  
EFFICIENCY  
85  
TK/SS  
BOOST  
330μF  
s2  
0.1μF  
80  
75  
INTV  
POWER LOSS  
CC  
2200pF  
4.7μF  
70  
65  
60  
55  
50  
BG  
I
TH  
GND  
330pF  
15k  
+
SENSE  
MODE/PLLIN  
SENSE  
0.047μF  
30.1k  
–
154k  
10  
10  
100  
1000  
10000  
100000  
V
FB  
LOAD CURRENT (mA)  
48.7k  
3851TA01b  
3851 TA01a  
3851fb  
1
1234567...28

中文翻译

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