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LTC3727-1

更新时间： 2024-11-10 22:21:55
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
32页 391K
描述
High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators

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LTC3727-1 数据手册

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LTC3727/LTC3727-1  
High Efficiency, 2-Phase  
Synchronous Step-Down Switching Regulators  
U
FEATURES  
DESCRIPTIO  
The LTC®3727/LTC3727-1 are high performance dual  
step-down switching regulator controllers that drive all  
N-channel synchronous power MOSFET stages. A con-  
stant frequency current mode architecture allows phase-  
lockable frequency 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% Output Voltage Accuracy  
Power Good Output Voltage Monitor  
Phase-Lockable Fixed Frequency 250kHz to 550kHz  
Latched Short-Circuit Shutdown (LTC3727 Only)  
Dual N-Channel MOSFET Synchronous Drive  
Wide VIN Range: 4V to 36V Operation  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Soft-Start Current Ramping  
Foldback Output Current Limiting  
Output Overvoltage Protection  
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
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.  
A RUN/SS pin for each controller provides soft-start, and  
on the LTC3727GN, optional timed, short-circuit shut-  
down. Current foldback limits MOSFET heat dissipation  
during short-circuit conditions when overcurrent latchoff  
isdisabled.Outputovervoltageprotectioncircuitrylatches  
on the bottom MOSFET until VOUT returns to normal. The  
FCB mode pin can select among Burst Mode, constant  
frequencymodeandcontinuousinductorcurrentmodeor  
regulate a secondary winding. The LTC3727/LTC3727-1  
include a power good output pin that indicates when both  
outputs are within 7.5% of their designed set point.  
Low Shutdown IQ: 20µA  
Small 28-Lead SSOP Package  
LTC3727-1 Also Available in the 5mm × 5mm QFN  
Package  
Selectable Constant Frequency or Burst Mode®  
Operation  
■
U
APPLICATIO S  
■
Telecom Systems  
■
Automotive Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.  
■
Battery-Operated Digital Devices  
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  
LTC3727/  
LTC3727-1  
M2  
BG1  
BG2  
PLLIN  
PGND  
+
+
SENSE1  
SENSE2  
1000pF  
1000pF  
220pF  
0.015Ω  
0.015Ω  
–
–
SENSE2  
V
SENSE1  
V
V
12V  
4A  
OUT1  
5V  
5A  
OUT2  
V
OSENSE1  
OSENSE2  
105k  
1%  
280k  
1%  
I
I
TH1  
TH2  
+
56µF  
15V  
SP  
220pF  
15k  
RUN/SS1  
SGND  
RUN/SS2  
+
20k  
1%  
47µF  
6V  
SP  
20k  
1%  
15k  
0.1µF  
0.1µF  
M1, M2, M3, M4: FDS6680A  
1628 F01  
Figure 1. High Efficiency Dual 12V/5V Step-Down Converter  
3727f  
1
1234567...32

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