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LTC3728LXCUH#TR

更新时间： 2024-11-13 12:57:51
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凌特 - Linear 稳压器开关
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32页 672K
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LTC3728LXCUH#TR 数据手册

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LTC3728  
Dual, 550kHz, 2-Phase  
Synchronous Step-Down Switching Regulator  
U
FEATURES  
DESCRIPTIO  
The LTC®3728 is a dual high performance 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.  
■
Dual, 180° Phased Controllers Reduce Required  
Input Capacitance and Power Supply Induced Noise  
OPTI-LOOP® Compensation Minimizes COUT  
±1% Output Voltage Accuracy  
Power Good Output Voltage Indicator  
Phase-Lockable Fixed Frequency 250kHz to 550kHz  
Dual N-Channel MOSFET Synchronous Drive  
Wide VIN Range: 3.5V to 36V Operation  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Soft-Start Current Ramping  
Foldback Output Current Limiting  
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
OPTI-LOOP compensation allows the transient response  
tobeoptimizedoverawiderangeofoutputcapacitanceand  
ESRvalues. Theprecision0.8Vreferenceandpowergood  
output indicator are compatible with future microproces-  
sor generations, and a wide 3.5V to 30V (36V maximum)  
input supply range encompasses all battery chemistries.  
Latched Short-Circuit Shutdown with Defeat Option  
Output Overvoltage Protection  
Remote Output Voltage Sense  
A RUN/SS pin for each controller provides both soft-start  
and optional timed, short-circuit shutdown. Current  
foldback limits MOSFET dissipation during short-circuit  
conditions when overcurrent latchoff is disabled. Output  
overvoltage protection circuitry latches on the bottom  
MOSFET until VOUT returns to normal. The FCB mode pin  
can select among Burst Mode, constant frequency mode  
and continuous inductor current mode or regulate a  
secondary winding. The LTC3728 includes a power good  
output pin that indicates when both outputs are within  
7.5% of their designed set point.  
Low Shutdown IQ: 20µA  
5V and 3.3V Regulators  
3 Selectable Operating Modes: Constant Frequency,  
Burst Mode® Operation and PWM  
■
Available in 32-Pin 5mm × 5mm QFN and  
28-Pin SSOP Packages  
U
APPLICATIO S  
■
Notebook and Palmtop Computers  
■
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.  
Portable Instruments  
■
Battery-Operated Digital Devices  
■
DC Power Distribution Systems  
U
V
IN  
5.2V TO 28V  
+
C
IN  
TYPICAL APPLICATIO  
4.7µF  
22µF  
1µF  
D3  
D4  
50V  
V
PGOOD INTV  
IN  
CC  
M2  
M1  
TG1  
TG2  
L1  
3.2µH  
L2  
3.2µH  
BOOST1  
SW1  
BOOST2  
SW2  
C
, 0.1µF  
B1  
C
, 0.1µF  
B2  
LTC3728  
BG1  
BG2  
f
IN  
500kHz  
PLLIN  
PGND  
+
+
SENSE1  
SENSE2  
R
R
SENSE2  
SENSE1  
1000pF  
1000pF  
0.01Ω  
0.01Ω  
–
–
SENSE1  
V
SENSE2  
V
V
3.3V  
5A  
OSENSE1  
TH1  
OSENSE2  
V
OUT2  
OUT1  
5V  
5A  
R2  
R4  
63.4k  
1%  
I
I
TH2  
105k  
1%  
C
C
C2  
C1  
220pF  
C
47µF  
6V  
C
56µF  
6V  
RUN/SS1  
SGND  
RUN/SS2  
OUT1  
OUT  
220pF  
R
C2  
+
+
R1  
20k  
1%  
R3  
20k  
1%  
R
C1  
C
C
SS1  
0.1µF  
SS2  
0.1µF  
15k  
15k  
SP  
SP  
M1, M2: FDS6982S  
3728 F01  
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter  
3728fb  
1
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中文翻译

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LTC3728LXCUH#TR 替代型号

型号 品牌 替代类型 描述 数据表
LTC3728LXCUH#PBF Linear

完全替代

 LTC3728L and LX - Dual, 550kHz, 2-Phase Synchronous Regulators; Package: QFN; Pins: 32; Te

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