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LTC3855EUJTRPBF

更新时间： 2024-09-27 05:43:55
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
44页 2108K
描述
Dual, Multiphase Synchronous DC/DC Controller with Differential Remote Sense

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LTC3855EUJTRPBF 数据手册

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LTC3855  
Dual, Multiphase  
Synchronous DC/DC Controller  
with Differential Remote Sense  
FeaTures  
DescripTion  
TheLTC®3855isadualPolyPhase® currentmodesynchro-  
n
Dual, 180° Phased Controllers Reduce Required  
Input Capacitance and Power Supply Induced Noise  
High Efficiency: Up to 95%  
SENSE  
Programmable DCR Temperature Compensation  
0ꢀ.5% 0ꢀꢁ6 ꢂutput 6oltage Accuracy  
nous step-down switching regulator controller that drives  
all N-channel power MOSFET stages. It includes a high  
speed differential remote sense amplifier. The maximum  
current sense voltage is programmable for either 30mV,  
50mVor75mV, allowingtheuseofeithertheinductorDCR  
or a discrete sense resistor as the sensing element.  
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
R
or DCR Current Sensing  
Phase-Lockable Fixed Frequency 250kHz to ..0kHz  
True Remote Sensing Differential Amplifier  
Dual N-Channel MOSFET Synchronous Drive  
The LTC3855 features a precision 0.6V reference and can  
produce output voltages up to 12.5V. A wide 4.5V to 38V  
input supply range encompasses most intermediate bus  
voltages and battery chemistries. Power loss and supply  
noiseareminimizedbyoperatingthetwocontrolleroutput  
stages out of phase. Burst Mode® operation, continuous  
or pulse-skipping modes are supported.  
Wide V Range: 4.5V to 38V  
IN  
V
V
Range: 0.6V to 12.5V without Differential Amplifier  
Range: 0.6V to 3.3V with Differential Amplifier  
OUT  
OUT  
Clock Input and Output for Up to 12-Phase Operation  
Adjustable Soft-Start or V  
Tracking  
OUT  
Foldback Output Current Limiting  
The LTC3855 can be configured for up to 12-phase op-  
eration, has DCR temperature compensation, two power  
good signals and two current limit set pins. The LTC3855  
is available in low profile 40-pin 6mm × 6mm QFN and  
38-lead exposed pad FE packages.  
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and PolyPhase are registered  
trademarks of Linear Technology Corporation. All other trademarks are the property of their  
respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6100678,  
6144194, 6177787, 6304066, 6580258.  
Output Overvoltage Protection  
40-Pin (6mm × 6mm) QFN and 38-Lead FE Packages  
applicaTions  
n
Computer Systems  
n
Telecom Systems  
n
Industrial and Medical Instruments  
DC Power Distribution Systems  
n
Typical applicaTion  
High Efficiency Dual 1ꢀ86/1ꢀ26 Step-Down Converter  
V
IN  
Load Step  
(Forced Continuous Mode)  
4.5V TO  
20V  
+
22µF  
1µF  
4.7µF  
V
IN  
INTV  
CC  
TG1  
TG2  
I
LOAD  
0.1µF  
0.1µF  
5A/DIV  
BOOST1  
SW1  
BOOST2  
SW2  
0.4µH  
0.56µH  
300mA TO 5A  
BG1  
BG2  
I
L
PGND1  
PGND2  
FREQ  
5A/DIV  
LTC3855  
+
+
SENSE1  
SENSE1  
SENSE2  
–
–
SENSE2  
V
OUT  
20k  
V
100mV/DIV  
OUT1  
1.8V  
15A  
V
DIFFOUT  
OUT2  
AC-COUPLED  
V
FB1  
1.2V  
V
FB2  
15A  
40.2k  
I
I
TH1  
TK/SS1 DIFFP SGND DIFFN TK/SS2  
TH2  
470pF  
470pF  
7.5k  
20k  
+
+
330µF  
×2  
330µF  
×2  
3855 TA01a  
20k  
100k  
15k  
50µs/DIV  
0.1µF  
0.1µF  
V
V
= 12V  
IN  
OUT  
= 1.8V  
3855 TA01  
3855f  
ꢀ
1234567...44

中文翻译

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