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LTC3851A PDF预览

LTC3851A

更新时间： 2024-01-17 19:09:15
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
40页 2704K
描述
Dual, 2-Phase Synchronous Step-Down DC/DC Controllers

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中文翻译

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LTC3851A 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Active包装说明：HVQCCN,
针数：16Reach Compliance Code：compliant
风险等级：5.14其他特性：ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8V TO 5.5V
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 V
JESD-30 代码：S-PQCC-N16JESD-609代码：e3
长度：3 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封装主体材料：PLASTIC/EPOXY
封装代码：HVQCCN封装形状：SQUARE
封装形式：CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度（摄氏度）：250
认证状态：Not Qualified座面最大高度：0.8 mm
表面贴装：YES切换器配置：PUSH-PULL
最大切换频率：790 kHz温度等级：OTHER
端子面层：Matte Tin (Sn)端子形式：NO LEAD
端子节距：0.5 mm端子位置：QUAD
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：3 mm
Base Number Matches：1

LTC3851A 数据手册

 浏览型号LTC3851A的Datasheet PDF文件第2页浏览型号LTC3851A的Datasheet PDF文件第3页浏览型号LTC3851A的Datasheet PDF文件第4页浏览型号LTC3851A的Datasheet PDF文件第5页浏览型号LTC3851A的Datasheet PDF文件第6页浏览型号LTC3851A的Datasheet PDF文件第7页 
LTC3869/LTC3869-2  
Dual, 2-Phase  
Synchronous Step-Down  
DC/DC Controllers  
FEATURES  
DESCRIPTION  
n
Dual, 180° Phased Controllers Reduce Required  
The LTC®3869 is a high performance dual synchronous  
step-down switching regulator controller that drives all  
N-channelsynchronouspowerMOSFETstages.Aconstant  
frequency current mode architecture allows a phase-  
lockable frequency of up to 780kHz. Power loss and noise  
due to the ESR of the input capacitors are minimized by  
operating the two controller output stages out-of-phase.  
OPTI-LOOP® compensation allows the transient response  
to be optimized over a wide range of output capacitance  
and ESR values. The LTC3869 features a precision 0.6V  
reference and a power good output indicator. A wide 4V  
to 38V input supply range encompasses most battery  
chemistries. Independent TK/SS pins for each controller  
ramp the output voltage during start-up. Current foldback  
limitsMOSFETheatdissipationduringshort-circuitcondi-  
tions. The MODE/PLLIN pin selects among Burst Mode®  
operation, pulse-skipping mode, or continuous inductor  
current mode and allows the IC to be synchronized to an  
external clock.  
Input Capacitance and Power Supply Induced Noise  
n
Accurate Multiphase Current Matching  
n
R
SENSE  
or DCR Current Sensing  
n
n
n
n
n
n
n
n
n
n
n
n
0ꢀ.75 0ꢀꢁ6 ꢂutput 6oltage Accuracy  
Phase-Lockable Fixed Frequency 270kHz to .80kHz  
High Efficiency: Up to 95%  
Dual N-channel MOSFET Synchronous Drive  
Wide V Range: 4V to 38V (40V Max) Operation  
IN  
Wide V  
Range: 0.6V to 12.5V Operation  
OUT  
Adjustable Soft-Start Current Ramping or Tracking  
Foldback Output Current Limiting  
Output Overvoltage Protection  
Power Good Output Voltage Monitor  
5V Low Dropout Regulator  
Small 28-Lead QFN and Narrow SSOP Packages  
APPLICATIONS  
n
Server Systems  
n
Telecom Systems  
TheLTC3869ispincompatiblewithLTC3850andis available  
inbothlowprofile28-leadQFNandnarrowSSOPpackages.  
L, LT, LTC, LTM, Linear Technology, the Linear logo, OPTI-LOOP, Burst Mode and PolyPhase  
n
Industrial and Medical Instruments  
n
High Power Battery-Operated Devices  
n
DC Power Distribution Systems  
are registered trademarks and No R  
is a trademark of Linear Technology Corporation. All  
SENSE  
other trademarks are the property of their respective owners. Protected by U.S. Patents including  
5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6580258, 6498466, 6611131.  
TYPICAL APPLICATION  
High Efficiency Dual 76/3ꢀ36 Step-Down Converter  
Efficiency and Power Loss  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1300  
1200  
1100  
1000  
900  
V
IN  
V
V
= 12V, V  
= 12V, V  
= 3.3V  
= 5V  
IN  
IN  
OUT  
OUT  
7V TO  
24V  
+
22µF  
1µF  
4.7µF  
V
PGOOD INTV  
IN  
CC  
TG2  
TG1  
EFFICIENCY  
0.1µF  
0.1µF  
BOOST1  
SW1  
BOOST2  
SW2  
3.2µH  
2.2µH  
800  
LTC3869  
BG1  
BG2  
700  
f
IN  
MODE/PLLIN  
PGND  
FREQ  
500kHz  
600  
I
LIM  
+
+
POWER LOSS  
SENSE1  
SENSE2  
RUN2  
SENSE2  
500  
RUN1  
–
–
V
V
OUT1  
5V  
5A  
SENSE1  
400  
OUT2  
0.01  
0.1  
1
10  
3.3V  
V
V
FB1  
TH1  
FB2  
TH2  
5A  
LOAD CURRENT (A)  
147k  
90.9k  
I
I
3869 TA01b  
470pF  
15k  
470pF  
15k  
TK/SS1 SGND TK/SS2  
+
+
20k  
20k  
56µF  
122k  
47µF  
0.1µF  
0.1µF  
3869 TA01  
3869f  
1
1234567...40

中文翻译

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