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LTC3784IGN#TRPBF

更新时间： 2025-09-18 18:58:55
品牌 Logo 应用领域
亚德诺 - ADI 开关
页数 文件大小 规格书
38页 517K
描述
最小工作电压(V):4.5V;最大工作电压(V):60V;元器件封装:28-SSOP;最大开关频率(KHz):105kHz ~ 760kHz;

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LTC3784IGN#TRPBF 数据手册

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LTC3784  
60V PolyPhase Synchronous  
Boost Controller  
FeaTures  
DescripTion  
PolyPhase® Operation Reduces Required Input and  
The LTC®3784 is a high performance PolyPhase® single  
outputsynchronousboostconvertercontrollerthatdrives  
two N-channel power MOSFET stages out-of-phase.  
Multiphase operation reduces input and output capacitor  
requirements and allows the use of smaller inductors than  
the single-phase equivalent. Synchronous rectification in-  
creasesefficiency,reducespowerlossesandeasesthermal  
requirements, simplifying high power boost applications.  
n
Output Capacitance and Power Supply Induced Noise  
n
Synchronous Operation for Highest Efficiency and  
Reduced Heat Dissipation  
n
Wide V Range: 4.5V to 60V (65V Abs Max);  
IN  
Operates Down to 2.3V After Start-Up  
Output Voltage Up to 60V  
n
n
n
n
n
n
n
n
n
n
n
±±1 ±.200V Reference Voltage  
R
or Inductor DCR Current Sensing  
SENSE  
A 4.5V to 60V input supply range encompasses a wide  
range of system architectures and battery chemistries.  
When biased from the output of the boost converter or  
anotherauxiliarysupply, theLTC3784canoperatefroman  
input supply as low as 2.3V after start-up. The operating  
frequency can be set within a 50kHz to 900kHz range or  
synchronized to an external clock using the internal PLL.  
PolyPhase operation allows the LTC3784 to be configured  
for 2-, 3-, 4-, 6- and 12-phase operation.  
±001 Duty Cycle Capability for Synchronous MOSFET  
Low Quiescent Current: 28μA  
Phase-Lockable Frequency (75kHz to 850kHz)  
Programmable Fixed Frequency (50kHz to 900kHz)  
Power Good Output Voltage Monitor  
Low Shutdown Current, I < 4µA  
Q
Internal LDO Powers Gate Drive from VBIAS or EXTV  
CC  
Thermally Enhanced Low Profile 28-Pin 4mm × 5mm  
QFN Package and Narrow SSOP Package  
The SS pin ramps the output voltage during start-up. The  
PLLIN/MODE pin selects Burst Mode® operation, pulse-  
skipping mode or forced continuous mode at light loads.  
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, OPTI-LOOP and PolyPhase  
applicaTions  
n
Industrial  
n
Automotive  
are registered trademarks and No R  
and ThinSOT are trademarks of Linear Technology  
SENSE  
Corporation. All other trademarks are the property of their respective owners. Protected by  
U. S. Patents, including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258.  
n
Medical  
Military  
n
Typical applicaTion  
240W, ±2V to 24V/±0A 2-Phase Synchronous Boost Converter  
3.3µH  
4mΩ  
+
SENSE1  
SENSE1  
47µF  
Efficiency and Power Loss  
vs Output Current  
–
BG1  
BOOST1  
100  
90  
10000  
1000  
100  
10  
0.1µF  
4.7µF  
V
V
OUT  
IN  
4.5V TO 60V  
VBIAS  
24V AT 10A  
SW1  
TG1  
DOWN TO 2.3V AFTER  
STARTUP IF VBIAS IS  
220µF  
80  
LTC3784  
POWERED FROM V  
OUT  
70  
INTV  
CC  
V
60  
50  
OUT  
FOLLOWS V  
3.3µH  
4mΩ  
IN  
FOR V > 24V  
IN  
+
SENSE2  
SENSE2  
40  
30  
20  
10  
0
–
BURST EFFICIENCY  
BURST LOSS  
= 12V  
= 24V  
Burst Mode OPERATION  
FIGURE 10 CIRCUIT  
BG2  
V
V
IN  
OUT  
1
BOOST2  
0.1µF  
FREQ  
OVMODE  
PLLIN/MODE  
0.1  
SW2  
TG2  
VFB  
0.00001 0.0001 0.001 0.01  
0.1  
1
10  
OUTPUT CURRENT (A)  
3784 TA01b  
ITH  
3784 TA01a  
SS  
SGND PGND  
232k  
12.1k  
15nF  
8.66k  
100pF  
0.1µF  
3784fb  
1
For more information www.linear.com/LTC3784  
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