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LTC3727LXEG-1 PDF预览

LTC3727LXEG-1

更新时间: 2024-11-11 05:43:55
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
28页 412K
描述
High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator

LTC3727LXEG-1 数据手册

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LTC3727LX-1  
High Efficiency, 2-Phase  
Synchronous Step-Down  
Switching Regulator  
U
FEATURES  
DESCRIPTIO  
TheLTC®3727LX-1isahighperformancedualstep-down  
switching regulator controller that drives all N-channel  
synchronouspowerMOSFETstages.Aconstant-frequency  
currentmodearchitectureallowsphase-lockablefrequency  
of up to 550kHz. Power loss and noise due to the ESR of  
the input capacitors are minimized by operating the two  
controller output stages out of phase.  
Wide Output Voltage Range: 0.8V VOUT 14V  
Out-of-Phase Controllers Reduce Required Input  
Capacitance and Power Supply Induced Noise  
OPTI-LOOP® Compensation Minimizes COUT  
±1.5% Output Voltage Accuracy  
Power Good Output Voltage Monitor  
Phase-Lockable Fixed Frequency 250kHz to 550kHz  
Dual N-Channel MOSFET Synchronous Drive  
OPTI-LOOP compensation allows the transient response  
tobeoptimizedoverawiderangeofoutputcapacitanceand  
ESRvalues.Thereisa precision0.8Vreferenceandapower  
good output indicator. A wide 4V to 28V (32V maximum)  
input supply range encompasses all battery chemistries.  
Wide VIN Range: 4V to 32V Operation  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Soft-Start Current Ramping  
Foldback Output Current Limiting  
Output Overvoltage Protection  
Table 1  
Low Shutdown IQ: 20µA  
Selectable Constant-Frequency or Burst Mode®  
PART  
V
IN  
V
REF  
ACCURACY  
LATCH- MINIMUM  
NUMBER  
RANGE OVERTEMPERATURE  
OFF  
ON-TIME  
120ns  
180ns  
180ns  
120ns  
Operation  
LTC3727LX-1 4V to 32V  
±1.5%  
±1%  
No  
Small 28-Lead SSOP and 5mm × 5mm QFN Packages  
LTC3727  
4V to 36V  
4V to 36V  
Yes  
No  
U
LTC3727-1  
±1%  
APPLICATIO S  
LTC3727A-1 4V to 36V  
±1%  
No  
Telecom Systems  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst  
Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners. Protected by U.S. Patents, including  
5481178, 5929620, 6177787, 6144194, 6100678, 5408150, 6580258, 6304066, 5705919.  
Automotive Systems  
Distributed DC Power Systems  
U
TYPICAL APPLICATIO  
V
IN  
18V TO 28V  
+
22µF  
1µF  
CERAMIC  
50V  
4.7µF  
CERAMIC  
V
IN  
PGOOD INTV  
CC  
M1  
M3  
M4  
TG1  
TG2  
0.1µF  
BOOST1  
SW1  
BOOST2  
SW2  
0.1µF  
15µH  
8µH  
LTC3727LX-1  
M2  
BG1  
BG2  
PLLIN  
SENSE1  
PGND  
+
+
SENSE2  
1000pF  
1000pF  
220pF  
0.015  
0.015Ω  
SENSE2  
SENSE1  
V
V
V
12V  
4A  
OUT1  
5V  
5A  
OUT2  
V
OSENSE1  
TH1  
OSENSE2  
105k  
1%  
280k  
1%  
I
I
TH2  
+
56µF  
220pF  
15k  
+
20k  
1%  
47µF  
6V  
SP  
RUN/SS1  
RUN/SS2  
SGND  
15V  
SP  
20k  
1%  
15k  
0.1µF  
0.1µF  
M1, M2, M3, M4: FDS6680A  
3727LX1 F01  
Figure 1. High Efficiency Dual 12V/5V Step-Down Converter  
3727lx1fa  
1

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