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LTC3733-1_15 PDF预览

LTC3733-1_15

更新时间： 2024-09-26 01:22:31
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
32页 294K
描述
3-Phase, Buck Controllers for AMD CPUs

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LTC3733-1_15 数据手册

 浏览型号LTC3733-1_15的Datasheet PDF文件第2页浏览型号LTC3733-1_15的Datasheet PDF文件第3页浏览型号LTC3733-1_15的Datasheet PDF文件第4页浏览型号LTC3733-1_15的Datasheet PDF文件第5页浏览型号LTC3733-1_15的Datasheet PDF文件第6页浏览型号LTC3733-1_15的Datasheet PDF文件第7页 
LTC3733/LTC3733-1  
3-Phase, Buck  
Controllers for AMD CPUs  
U
FEATURES  
DESCRIPTIO  
The LTC®3733 family are PolyPhase® synchronous step-  
down switching regulator controllers that drive all  
N-channel external power MOSFET stages in a phase-  
lockable, fixed frequency architecture. The 3-phase con-  
troller drives its output stages with 120° phase separation  
at frequencies of up to 530kHz per phase to minimize the  
RMS current dissipated by the ESR of both the input and  
■
3-Phase Controller with Onboard MOSFET Drivers  
■
Current Mode Control Ensures Current Sharing  
■
Differential Amplifier Accurately Senses VOUT  
■
±5% Output Current Matching Optimizes Thermal  
Performance and Size of Inductors and MOSFETs  
■
Reduced Input and Output Capacitance  
Supports Active Voltage Positioning  
■
■
VID Programmable Output Voltage from 0.8V to 1.55V output filter capacitors. The 3-phase technique effectively  
(AMD OpteronTM CPU)  
triples the fundamental frequency, improving transient  
response while operating each phase at an optimal fre-  
quency for efficiency and ease of thermal design. Light  
load efficiency is optimized by using a choice of output  
stage shedding or Burst Mode technology.  
■
■
■
■
■
■
■
■
■
■
6-Phase, 90A to 120A Operation  
Output Power Good Indicator with Adaptive Blanking  
210kHz to 530kHz Per Phase, PLL, Fixed Frequency  
Synchronizable (LTC3733-1)  
PWM, Stage Shedding or Burst Mode® Operation  
OPTI-LOOP® Compensation Minimizes COUT  
Adjustable Soft-Start Current Ramping  
Short-Circuit Shutdown Timer with Defeat Option  
No_CPU Detection  
Adifferentialamplifierprovidestrueremotesensingofboth  
the high and low sides of the output voltage at load points.  
Soft-startandadefeatable, timedshort-circuitshutdown  
protect the MOSFETs and the load. A foldback current  
circuitalsoprovidesprotectionfortheexternalMOSFETs  
undershort-circuitoroverloadconditions. Anall-“1”VID  
detector turns off the regulator after 1µs timeout.  
36-Lead 0.209" SSOP and 38-Lead (5mm × 7mm) QFN  
U
APPLICATIO S  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode, OPTI-LOOP and PolyPhase are registered trademarks of Linear Technology  
Corporation. AMD Opteron is a trademark of Advanced Micro Devices, Inc.  
■
High Performance Notebook Computers  
Servers, Desktop Computers and Workstations  
■
U
TYPICAL APPLICATIO  
V
IN  
5V TO 28V  
5V  
V
TG1  
SW1  
BG1  
CC  
+
22µF  
35V  
×2  
L1 0.8µH  
0.002Ω  
0.002Ω  
LTC3733-1  
10µF  
BOOST1  
BOOST2  
BOOST3  
D1  
+
SENSE1  
0.1µF  
–
SENSE1  
V
V
SW3 SW2 SW1  
IN  
TG2  
PGOOD  
PLLIN  
POWER GOOD INDICATOR  
OPTIONAL SYN IN  
L2 0.8µH  
V
OUT  
SW2  
BG2  
0.8V TO 1.55V  
65A  
PLLFLTR  
D2  
PGND  
5 VID BITS  
ON/OFF  
VID0-VID4  
RUN  
+
SENSE2  
–
680pF  
SENSE2  
IN  
I
TG3  
SW3  
BG3  
TH  
L3 0.8µH  
0.002Ω  
5k  
SS  
0.1µF  
D3  
SGND  
EAIN  
+
100pF  
SENSE3  
C
OUT  
–
–
+
+
SENSE3  
IN  
IN  
470µF  
4V  
×4  
3733 F01  
Figure 1. High Current Triple Phase Step-Down Converter  
3733f  
1
1234567...32

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