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LTC3728LX PDF预览

LTC3728LX

更新时间： 2024-09-24 22:55:55
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
32页 661K
描述
Dual, 550kHz, 2-Phase Synchronous Regulators

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中文翻译

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LTC3728LX 数据手册

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LTC3728L/LTC3728LX  
Dual, 550kHz, 2-Phase  
Synchronous Regulators  
U
FEATURES  
DESCRIPTIO  
The LTC®3728L/LTC3728LX are dual high performance  
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.  
■
Dual, 180° Phased Controllers Reduce Required  
Input Capacitance and Power Supply Induced Noise  
OPTI-LOOP® Compensation Minimizes COUT  
■
■
±1% Output Voltage Accuracy (LTC3728LC)  
Power Good Output Voltage Indicator  
■
■
Phase-Lockable Fixed Frequency 250kHz to 550kHz  
■
Dual N-Channel MOSFET Synchronous Drive  
■
Wide VIN Range: 4.5V to 28V Operation  
OPTI-LOOP compensation allows the transient response  
tobeoptimizedoverawiderangeofoutputcapacitanceand  
ESRvalues. Theprecision0.8Vreferenceandpowergood  
output indicator are compatible with future microproces-  
sor generations, and a wide 4.5V to 28V (30V maximum)  
input supply range encompasses all battery chemistries.  
■
Very Low Dropout Operation: 99% Duty Cycle  
■
Adjustable Soft-Start Current Ramping  
Foldback Output Current Limiting  
■
■
Latched Short-Circuit Shutdown with Defeat Option  
Output Overvoltage Protection  
Low Shutdown IQ: 20µA  
5V and 3.3V Standby Regulators  
3 Selectable Operating Modes: Constant Frequency,  
Burst Mode® Operation and PWM  
5mm × 5mm QFN and 28-Lead Narrow SSOP  
Packages  
■
■
■
■
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 LTC3728L/LTC3728LX include a  
power good output pin that indicates when both outputs  
are within 7.5% of their designed set point.  
■
U
APPLICATIO S  
■
Notebook and Palmtop Computers  
■
Telecom Systems  
■
Portable Instruments  
■
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.  
■
DC Power Distribution Systems  
U
TYPICAL APPLICATIO  
V
IN  
5.2V TO 28V  
C
IN  
1µF  
CERAMIC  
+
22µF  
4.7µF  
D3  
50V  
D4  
V
PGOOD INTV  
IN  
CC  
M2  
M1  
CERAMIC  
TG1  
TG2  
L1  
3.2µH  
L2  
3.2µH  
BOOST1  
SW1  
BOOST2  
SW2  
C
, 0.1µF  
C
B2  
, 0.1µF  
B1  
LTC3728L/  
LTC3728LX  
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  
3728lxfa  
1
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