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LTC3853 PDF预览

LTC3853

更新时间： 2024-11-09 05:43:55
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
36页 415K
描述
Triple Output, Multiphase Synchronous Step-Down Controller

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LTC3853 数据手册

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LTC3853  
Triple Output,  
Multiphase Synchronous  
Step-Down Controller  
FEATURES  
DESCRIPTION  
The LTC®3853 is a high performance triple output step-  
downswitchingregulatorcontrollerthatdrivesallN-chan-  
nel synchronous power MOSFET stages. Power loss and  
supplynoiseareminimizedbyoperatingtheoutputstages  
out of phase. The part can be configured as a dual phase  
controller plus a single phase controller if needed. The  
part can also be configured to provide a single 3-phase  
output for even higher output currents.  
n
Triple, 120° Phased Controllers Reduce Required  
Input Capacitance and Power Supply Induced Noise  
n
Configurable as a 180° Dual Phase Controller Plus a  
Single Phase Controller  
n
The Third Phase Can Regulate Up to a 13.5V Output  
n
High Efficiency: Up to 92%  
n
R
or DCR Current Sensing  
SENSE  
n
n
n
n
n
n
n
n
n
n
0.ꢀ5% 0.8V Output Voltage Accuracy  
Phase-Lockable Fixed Frequency 250kHz to ꢀ50kHz  
Supports Pre-Biased Outputs  
A wide 4.5V to 24V (28V maximum) input voltage sup-  
ply range encompasses most battery chemistries and  
intermediate bus voltages. Phase 3 can regulate output  
voltages up to 13.5V. A constant frequency current mode  
architecture allows for a phase-lockable frequency up to  
750kHz.  
Dual N-Channel MOSFET Synchronous Drive  
Wide V Range: 4.5V to 24V Operation (28V Abs Max)  
IN  
Adjustable Soft-Start Current Ramping or Tracking  
Foldback Output Current Limiting  
Output Overvoltage Protection  
Independent TK/SS pins for each output ramps the output  
voltagesandcanbeconfiguredforcoincidentorratiometric  
tracking. Current foldback limits MOSFET heat dissipation  
during short-circuit conditions. The MODE/PLLIN pin  
selects among Burst Mode® operation, pulse-skipping or  
continuous inductor current modes.  
Dual Power Good Output Voltage Monitors  
40-Lead 6mm × 6mm QFN Package  
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners. Protected by U.S. Patents,  
including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258.  
TYPICAL APPLICATION  
High Efficiency Triple 5V/3.3V/1.2V Step-Down Converter  
V
IN  
7V TO 24V  
22μF  
50V  
4.7μF  
V
IN  
INTV  
CC  
TG1  
PGOOD12  
PGOOD3  
TG2  
0.1μF  
2.2μH  
SW1,2,3  
2.2μH  
BOOST1,2,3  
SW2  
1μH  
SW1  
LTC3853  
BG1  
BG2  
2.2k  
1k  
2.2k  
f
IN  
MODE/PLLIN  
PGND  
500kHz  
0.1μF  
I
LIM  
FREQ/PLLFLTR  
0.1μF  
0.1μF  
10k  
+
–
+
–
SENSE1  
SENSE1  
SENSE2  
SENSE2  
V
3.3V  
5A  
OUT2  
V
FB2  
63.4k  
V
1.2V  
5A  
10nF  
10k  
V
OUT3  
OUT1  
5V  
5A  
+
V
FB1  
100μF  
6V  
RUN1,2,3  
20k  
105k  
I
TH1,2,3  
1500pF  
15k  
TG3  
SW3  
BG3  
V
220pF  
20k  
FB3  
+
100μF  
6V  
20k  
+
SGND  
100μF  
10V  
+
–
SENSE3  
SENSE3  
TK/SS1,2,3  
0.1μF  
3853f  
1
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