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LTC3874-1

更新时间： 2023-12-20 18:46:31
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
22页 1000K
描述
具 mΩ 以下 DCR 检测功能的多相降压型同步从属控制器

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中文翻译

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LTC3874-1 数据手册

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LTC3874-1  
PolyPhase Step-Down  
Synchronous Slave Controller with  
Sub-Milliohm DCR Sensing  
FeaTures  
DescripTion  
The LTC®3874-1 is a dual PolyPhase® current mode syn-  
chronous step-down slave controller. It enables high cur-  
rent,multiphaseapplicationswhenpairedwithacompanion  
master controller by extending the phase count. Compat-  
ible master controllers include the LTC3884-1, LTC3774,  
LTC3875,LTC3877andLTC3866.TheLTC3874-1employs  
a unique architecture that enhances the signal-to-noise  
ratio of the current sense signal, allowing the use of sub-  
milliohm DC resistance power inductors to maximize  
efficiency while reducing switching jitter. Its peak current  
mode architecture allows for accurate phase-to-phase  
current sharing even for dynamic loads.  
n
Phase Extender for High Phase Count Voltage Rails  
Operates with Power Blocks, DrMOS or External  
Gate Drivers and MOSFETs  
Accurate Phase-to-Phase Current Sharing  
Sub-Milliohm DCR Current Sensing  
n
n
n
n
n
n
n
n
Phase-Lockable Fixed Frequency 250kHz to 1MHz  
Immediate Response to Master IC's Fault  
Up to 12-Phase Operation  
Wide V Range: 4.5 to 38V  
IN  
V
Range : Up to 3.5V (LOWDCR Pin High)  
OUT  
Up to 5.5V (LOWDCR Pin Low)  
n
n
n
n
Proprietary Current Mode Control Loop  
Programmable CCM/DCM Operation  
Programmable Phase Shift Control  
24-Lead (4mm × 4mm) QFN Package  
Effectivelyworkingwithamastercontroller,theLTC3874-1  
supports all the programmable features as well as fault  
protection.  
L, LT, LTC, LTM, Linear Technology, the Linear logo, PolyPhase and µModule are registered  
trademarks of Analog Devices, Inc. All other trademarks are the property of their respective  
owners. Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6144194, 6177787,  
6580258, 5408150.  
applicaTions  
n
High Current Distributed Power Systems  
n
Telecom, Datacom and Storage Systems  
n
Intelligent Energy Efficient Power Regulation  
Typical applicaTion  
High Efficiency, 4-Phase 1.8V/120A Step-Down Supply  
V
IN  
7V TO 14V  
4-Phase Efficiency and Power  
V
IN  
LTC3874-1  
PWM0  
PWM1  
Loss vs Output Current, Sub-  
(0.29mΩ DCR)  
0.215µH  
(0.29mΩ DCR)  
0.215µH  
V
OUT  
Milliohm DCR vs Traditional  
DCR  
1.8V  
DrMOS  
DrMOS  
120A  
649Ω  
649Ω  
100µF  
×3  
100µF  
×3  
470µF  
×2  
470µF  
×2  
100  
95  
90  
85  
80  
75  
70  
20  
17  
14  
11  
8
0.22µF  
0.22µF  
V
V
f
= 12V  
+
IN  
OUT  
= 425kHz  
+
= 1.8V  
+
–
+
–
SW  
I
I
I
I
SENSE0  
SENSE0  
SENSE1  
SENSE1  
CCM  
EFFICIENCY  
LTC3884-1  
RUN0  
RUN1  
RUN0  
INTV  
CC  
RUN1  
V
CC0  
4.7µF  
FAULT0  
FAULT1  
PGOOD0  
FAULT0  
FAULT1  
V
CC1  
PHASMD  
POWER LOSS  
1.8V  
MODE0 LDWDCR  
+
+
V
V
SENSE0  
SENSE1  
PGOOD1  
MODE1  
TH0  
ILIM  
0.29mΩ  
1.5mΩ  
0.29mΩ  
1.5mΩ  
I
I
TH0  
100k  
5
I
I
FREQ  
GND  
TH1  
SYNC  
TH1  
SYNC  
2
0
10 20 30 40 50 60 70 80 90 100 110 120  
LOAD CURRENT (A)  
38741 TA01a  
38741 TA01b  
REFER TO LTC3884-1 DATA SHEET  
FOR MASTER SETUP  
PIN NOT USED IN THIS CIRCUIT: EXTV  
CC  
38741f  
1
For more information www.linear/LTC3874-1  
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