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LTC3731CG

更新时间： 2024-02-11 04:45:28
品牌 Logo 应用领域
凌特 - Linear 稳压器开关控制器
页数 文件大小 规格书
32页 326K
描述
3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

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LTC3731CG 数据手册

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LTC3731  
3-Phase, 600kHz,  
Synchronous Buck Switching  
Regulator Controller  
U
DESCRIPTIO  
FEATURES  
The LTC®3731 is a PolyPhase® synchronous step-down  
switching regulator controller that drives all N-channel ex-  
ternal power MOSFET stages in a phase-lockable fixed fre-  
quency architecture. The 3-phase controller drives its  
outputstageswith120°phaseseparationatfrequenciesof  
upto600kHzperphasetominimizetheRMScurrentlosses  
in both the input and output filter capacitors. The 3-phase  
technique effectively triples the fundamental frequency,  
improvingtransientresponsewhileoperatingeachcontrol-  
ler at an optimal frequency for efficiency and ease of ther-  
mal design. Light load efficiency is optimized by using a  
choice of output Stage Shedding or Burst Mode operation.  
■
3-Phase Current Mode Controller with Onboard  
MOSFET Drivers  
■
±5% Output Current Matching Optimizes Thermal  
Performance and Size of Inductors and MOSFETs  
■
Differential Amplifier Accurately Senses VOUT  
■
■
■
■
■
■
■
■
■
■
■
■
±1% VREF Accuracy Over Temperature  
Reduced Power Supply Induced Noise  
±10% Power Good Output Indicator  
250kHz to 600kHz Per Phase, PLL, Fixed Frequency  
PWM, Stage SheddingTM or Burst Mode® Operation  
OPTI-LOOP® Compensation Minimizes COUT  
Adjustable Soft-Start Current Ramping  
Short-Circuit Shutdown Timer with Defeat Option  
Overvoltage Soft Latch  
Adjustable Undervoltage Lockout Threshold  
Selectable Phase Output for Up to 12-Phase Operation  
Available in 5mm × 5mm QFN and 36-Pin Narrow  
Adifferentialamplifierprovidestrueremotesensingofboth  
the high and low side of the output voltage at the point of  
load.Theprecisionreferencesupportsoutputvoltagesfrom  
0.6V to 6V.  
Soft-startandadefeatable, timedshort-circuitshutdown  
protect the MOSFETs and the load. Current foldback  
provides protection for the external MOSFETs under  
(0.209") SSOP PUackages  
APPLICATIO S  
short-circuit or overload conditions.  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Desktop Computers and Servers  
Burst Mode, OPTI-LOOP and PolyPhase are registered trademarks of Linear Technology  
Corporation. Stage Shedding is a trademark of Linear Technology Corporation.  
*Protected by U.S. Patents including 5481178, 5929620, 6177787, 6144194, 6100678,  
5408150, 6580258, 6462525, 6304066, 5705919.  
■
High Performance Notebook Computers  
■
High Output Current DC/DC Power Supplies  
U
TYPICAL APPLICATIO  
V
IN  
5V TO 28V  
V
CC  
V
TG1  
SW1  
BG1  
CC  
+
0.8µH  
0.8µH  
4.5V TO 7V  
0.003Ω  
0.003Ω  
22µF  
LTC3731  
10µF  
35V  
BOOST1  
BOOST2  
BOOST3  
+
SENSE1  
0.1µF  
–
SENSE1  
V
V
SW3 SW2 SW1  
IN  
TG2  
PGOOD  
PLLIN  
POWER GOOD INDICATOR  
OPTIONAL SYNC IN  
V
OUT  
SW2  
BG2  
1.35V  
55A  
PLLFLTR  
PGND  
36k  
V
IN  
UVADJ  
+
SENSE2  
12k  
–
680pF  
SENSE2  
IN  
I
TH  
TG3  
SW3  
BG3  
0.8µH  
0.003Ω  
5k  
RUN/SS  
0.01µF  
SGND  
EAIN  
100pF  
7.5k  
+
SENSE3  
DIFFOUT  
IN  
IN  
–
–
+
SENSE3  
+
C
OUT  
470µF  
6.04k  
4V  
3731 F01  
Figure 1. High Current Triple Phase Step-Down Converter  
3731fa  
1
1234567...32

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LTC3731CG 替代型号

型号 品牌 替代类型 描述 数据表
LTC3731CG#PBF Linear

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