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LTC3731H

更新时间： 2024-11-12 22:55:55
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 323K
描述
3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

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LTC3731H 数据手册

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LTC3731H  
3-Phase, 600kHz,  
Synchronous Buck Switching  
Regulator Controller  
U
DESCRIPTIO  
FEATURES  
The LTC®3731H is a PolyPhase® synchronous step-down  
switching regulator controller that drives all N-channel  
external power MOSFET stages in a phase-lockable fixed  
frequency architecture. The LTC3731H is rated for opera-  
tion up to 140°C junction temperature. The 3-phase con-  
troller drives its output stages with 120° phase separation  
at frequencies up to 600kHz per phase to minimize the  
RMS current losses in both the input and output filter  
capacitors. The 3-phase technique effectively triples the  
fundamentalfrequency,improvingtransientresponsewhile  
operating each controller at an optimal frequency for  
efficiencyandeaseofthermaldesign. Lightloadefficiency  
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  
■
±2% VREF Accuracy Over Temperature up to 140°C  
■
■
■
■
■
■
■
■
■
■
■
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  
Theprecisionreferencesupportsoutputvoltagesfrom0.6V  
to 6V. Current foldback provides protection for the exter-  
nal MOSFETs under short-circuit or overload conditions.  
PleaserefertotheLTC3731datasheetfor0°Cto70°Cand  
–40°C to 85°C rated versions.  
Available in 36-PUin Narrow (0.209") SSOP Package  
APPLICATIO S  
■
Automotive and Industrial Power Supplies  
High Output Current DC/DC Power Supplies  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
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.  
■
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  
LTC3731H  
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  
+
SENSE3  
7.5k  
–
SENSE3  
+
C
OUT  
470µF  
6.04k  
4V  
3731H F01  
Figure 1. High Current Triple Phase Step-Down Converter  
3731hf  
1
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