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LTC3727AEG-1 PDF预览

LTC3727AEG-1

更新时间： 2024-09-25 05:43:55
品牌 Logo 应用领域
凌特 - Linear 稳压器开关光电二极管
页数 文件大小 规格书
32页 412K
描述
High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators

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LTC3727AEG-1 数据手册

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LTC3727A-1  
High Efficiency, 2-Phase  
Synchronous Step-Down  
Switching Regulators  
U
FEATURES  
DESCRIPTIO  
The LTC®3727A-1 is a high performance dual step-down  
switching regulator controller that drives all N-channel  
synchronous power MOSFET stages. A constant fre-  
quency current mode architecture allows phase-lockable  
frequency of up to 550kHz. Power loss and noise due to  
theESRoftheinputcapacitorsareminimizedbyoperating  
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% Output Voltage Accuracy  
Power Good Output Voltage Monitor  
■
■
Phase-Lockable Fixed Frequency 250kHz to 550kHz  
■
Dual N-Channel MOSFET Synchronous Drive  
The LTC3727A-1 is an improved version of the LTC3727  
family of parts. It has smaller output ripple while in the  
drop-out condition and shorter minimum on-time.  
■
Wide VIN Range: 4V to 36V Operation  
■
Very Low Dropout Operation: 99% Duty Cycle  
■
Adjustable Soft-Start Current Ramping  
■
■
■
■
OPTI-LOOP compensation allows the transient response  
tobeoptimizedoverawiderangeofoutputcapacitanceand  
ESRvalues.Thereisa precision0.8Vreferenceandapower  
good output indicator. A wide 4V to 30V (36V maximum)  
input supply range encompasses all battery chemistries.  
Foldback Output Current Limiting  
Output Overvoltage Protection  
Low Shutdown IQ: 20µA  
Selectable Constant Frequency or Burst Mode®  
Operation  
■
Small 28-Lead SSOP Package  
A RUN/SS pin for each controller provides soft-start.  
Current foldback limits MOSFET heat dissipation during  
short-circuit conditions. Output overvoltage protection  
circuitry protects the controller until VOUT returns to  
normal.  
U
APPLICATIO S  
■
Telecom Systems  
■
Automotive Systems  
■
Battery-Operated Digital Devices  
, LTC and LT 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.  
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  
15µH  
8µH  
0.1µF  
LTC3727A-1  
M2  
BG1  
BG2  
PLLIN  
PGND  
+
+
SENSE1  
SENSE2  
1000pF  
1000pF  
220pF  
0.015Ω  
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  
RUN/SS1  
SGND  
RUN/SS2  
+
20k  
1%  
47µF  
6V  
SP  
15V  
SP  
20k  
1%  
15k  
0.1µF  
0.1µF  
M1, M2, M3, M4: FDS6680A  
3727 F01  
Figure 1. High Efficiency Dual 12V/5V Step-Down Converter  
3727a1f  
1
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