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LTC3874

更新时间： 2024-02-23 13:24:27
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
20页 1057K
描述
PolyPhase Step-Down Slave Controller for Digital Power System Management

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中文翻译

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LTC3874 数据手册

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LTC3870-1  
PolyPhase Step-Down  
Slave Controller for Digital  
Power System Management  
DescripTion  
FeaTures  
TheLTC®3870-1isaPolyPhase® step-downslavecontrol-  
ler specially designed for multiphase operation with LTC's  
digital power system management DC/DC controllers. It  
provides a small and cost effective solution for supply-  
ing very large currents by cascading it with a LTC3887-1  
controller. A peak current mode architecture provides the  
LTC3870-1 with excellent current sharing from phase to  
phase and from chip to chip.  
n
LTC3887-1 Phase Extender  
n
Operates with Power Blocks, DrMOS or External  
Gate Drivers and MOSFETs  
n
Cascade with Multiple Chips for Very Large Current  
Applications  
n
Accurate PolyPhase Current Sharing  
n
EXTV Capable of 5V to 14V Input  
CC  
n
n
n
n
n
n
Wide V Range: 4.5V to 60V  
IN  
Wide Output Voltage Range : 0.5V to 14V  
Wide SYNC Frequency Range: 100kHz to 1MHz  
Pin Programmable CCM/DCM Operation  
Pin Programmable Phase-Shift Control  
Coherently working with the LTC3887-1, the LTC3870-1  
2
doesnotrequireadditionalI Caddresses, anditsupports  
all programmable features as well as fault protection.  
The constant switching frequency can be synchronized  
to an external clock from the LTC3887-1 over a range of  
100kHz to 1MHz.  
Available in a 24-Pin (4mm × 4mm) QFN Package  
L, LT, LTC, LTM, PolyPhase, Linear Technology and the Linear logo 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, 6144194, 6177787,  
6580258, 5408150  
applicaTions  
n
High Power Distributed Power Systems  
Telecom Systems  
n
n
Industrial Applications  
Typical applicaTion  
Load Transient Response of a  
2-Phase Master (3887-1)/Slave  
(3870-1) Converter  
V
IN  
7V TO 14V  
22µF  
4.7µF  
V
INTV  
CC  
I
IN  
LOAD  
20A/DIV  
10A TO 20A TO 10A  
V
V
CC1  
CC0  
LTC3870-1  
I
LTC3887–1  
(CH0)  
10A/DIV  
L
V
V
OUT0  
3.3V, 30A  
OUT1  
1.8V, 40A  
1.0µH  
0.56µH  
DrMOS  
PWM0  
PWM1  
DrMOS  
I
LTC3870–1  
(CH0)  
10A/DIV  
L
2.15k  
0.2µF  
1.74k  
530µF  
530µF  
0.2µF  
V
I
+
I
+
OUT  
SENSE0  
SENSE1  
200mV/DIV  
I
-
I
-
SENSE0  
SENSE1  
AC–COUPLED  
38701 TA01b  
100µs/DIV  
EXTV  
CC  
LTC3887-1  
RUN0  
V
V
= 12V  
OUT  
RUN0  
IN  
= 1.8V  
RUN1  
GPIO0  
GPIO1  
RUN1  
82.5k  
3.3V  
V
+
FAULT0  
FAULT1  
FREQ  
PHASMD  
SENSE0  
1.8V  
V
+
I
I
I
LIM  
SENSE1  
TH0  
TH0  
TH1  
I
I
MODE0  
MODE1  
GND  
TH1  
SYNC  
SYNC  
* REFER TO LTC3887-1 DATA SHEET  
FOR MASTER SETUP  
38701 TA01a  
38701f  
1
For more information www.linear.com/LTC3870-1  
1234567...20

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