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LTC3869-2_15 PDF预览

LTC3869-2_15

更新时间： 2024-02-28 15:29:41
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
42页 524K
描述
Dual, 2-Phase Synchronous Step-Down DC/DC Controllers

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LTC3869-2_15 数据手册

 浏览型号LTC3869-2_15的Datasheet PDF文件第2页浏览型号LTC3869-2_15的Datasheet PDF文件第3页浏览型号LTC3869-2_15的Datasheet PDF文件第4页浏览型号LTC3869-2_15的Datasheet PDF文件第5页浏览型号LTC3869-2_15的Datasheet PDF文件第6页浏览型号LTC3869-2_15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. 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 limits MOSFET heat dissipation  
during short-circuit conditions. 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
or DCR Current Sensing  
SENSE  
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  
The LTC3869 is available in a 4mm × 5mm QFN package  
and the LTC3869-2 is available in an SSOP-28 package.  
The LTC3869 is pin-compatible with the LTC3850.  
L, LT, LTC, LTM, Linear Technology, the Linear logo, OPTI-LOOP, Burst Mode and PolyPhase  
n
Server Systems  
n
Telecom Systems  
n
Industrial and Medical Instruments  
n
High Power Battery-Operated Devices  
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.  
n
DC Power Distribution Systems  
Typical applicaTion  
High Efficiency Dual 76/3ꢀ36 Step-Down Converter  
Efficiency and Power Loss  
V
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1300  
1200  
1100  
1000  
900  
IN  
V
V
= 12V, V  
= 12V, V  
= 3.3V  
= 5V  
7V TO  
24V  
IN  
IN  
OUT  
OUT  
+
22µF  
1µF  
4.7µF  
V
PGOOD INTV  
IN  
CC  
TG2  
TG1  
EFFICIENCY  
0.1µF  
0.1µF  
BOOST1  
SW1  
BOOST2  
SW2  
3.2µH  
2.2µH  
LTC3869  
800  
BG1  
BG2  
f
700  
IN  
MODE/PLLIN  
PGND  
FREQ  
SENSE2  
500kHz  
I
LIM  
600  
+
+
SENSE1  
POWER LOSS  
500  
RUN1  
SENSE1  
RUN2  
SENSE2  
–
–
V
V
OUT1  
5V  
5A  
OUT2  
400  
3.3V  
V
V
0.01  
0.1  
1
10  
FB1  
TH1  
FB2  
TH2  
5A  
147k  
90.9k  
I
I
LOAD CURRENT (A)  
3869 TA01b  
470pF  
15k  
470pF  
15k  
TK/SS1 SGND TK/SS2  
+
+
20k  
20k  
56µF  
122k  
47µF  
0.1µF  
0.1µF  
3869 TA01  
38692fa  
1
For more information www.linear.com/LTC3869  
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