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LTC3865EUH-1

更新时间： 2024-09-15 05:43:59
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
36页 475K
描述
Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs

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LTC3865EUH-1 数据手册

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LTC3865/LTC3865-1  
Dual, 2-Phase Synchronous  
DC/DC Controller with  
Pin Selectable Outputs  
DescripTion  
The LTC®3865/LTC3865-1 are high performance dual  
synchronous step-down DC/DC switching regulator  
controllers that drive all N-channel synchronous power  
MOSFET stages. A constant frequency current mode  
architecture allows a phase-lockable frequency of up to  
770kHz. Power loss and noise are minimized by operating  
the two controller output stages out of phase.  
OPTI-LOOP® compensation allows the transient response  
to be optimized over a wide range of output capacitance  
and ESR values. Independent track/soft-start pins for  
each controller ramp the output voltage during start-up.  
Current foldback limits MOSFET heat dissipation during  
short-circuit conditions. The MODE/PLLIN pin selects  
among Burst Mode® operation, pulse-skipping mode,  
and continuous inductor current mode. The output volt-  
ages can be precisely programmed by pin strapping or  
external resistors.  
FeaTures  
n
Dual, 180° Phased Controllers  
n
2-Pin VID Output Voltage Programming from 0.6V  
to 5V  
n
High Efficiency: Up to 95%  
n
R
or DCR Current Sensing  
SENSE  
n
n
n
n
n
n
n
n
Phase-Lockable Fixed Frequency 250kHz to 770kHz  
Adjustable Current Limit  
Dual N-Channel MOSFET Synchronous Drive  
Wide V Range: 4.5V to 38V Operation  
IN  
Adjustable Soft-Start Current Ramping or Tracking  
Output OV Protection With Reverse Current Limit  
Power Good Output Voltage Monitor  
32-Pin 5mm × 5mm QFN and 38-Lead TSSOP  
Packages  
applicaTions  
n
DC Power Distribution Systems  
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, µModule, Linear Technology and the Linear logo  
The LTC3865/LTC3865-1 are available in low profile (5mm  
× 5mm) 32-pin QFN and 38-Lead thermally enhanced  
TSSOP packages.  
are registered trademarks and No R  
is a trademark of Linear Technology Corporation. All  
SENSE  
other trademarks are the property of their respective owners. U.S. Patents, including 5481178,  
5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258.  
Typical applicaTion  
High Efficiency 1.5V/15A, 1.2V/15A Step-Down Converter  
V
IN  
4.5V TO 24V  
+
22µF  
50V  
2.2Ω  
1µF  
Efficiency and Power Loss  
vs Load Current  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
10  
V
V
= 12V  
IN  
OUT  
4.7µF  
= 1.5V  
V
INTV  
CC  
IN  
TG1  
TG2  
0.1µF  
0.1µF  
1
EFFICIENCY  
0.47µH  
BOOST1  
SW1  
BOOST2  
SW2  
0.47µH  
POWER LOSS  
LTC3865  
BG2  
BG1  
PGND  
FREQ  
0.1  
0.01  
100Ω  
100Ω  
+
+
SENSE1  
SENSE2  
1000pF  
100Ω  
1000pF  
100Ω  
2mΩ  
2mΩ  
V
–
–
SENSE1  
VID11  
VID12  
V
SENSE2  
VID21  
VID22  
0.01  
0.1  
1
10  
100  
LOAD CURRENT (A)  
V
OUT2  
OUT1  
1.5V  
15A  
V
1.2V  
OSENSE2  
OSENSE1  
TH1  
3865 TA01b  
15A  
+
I
+
I
TH2  
C
1000pF  
10k  
1000pF  
15k  
C
OUT5,6  
OUT2,3  
TK/SS1  
SGND TK/SS2  
0.1µF  
0.1µF  
100µF  
162k  
100pF  
100µF  
100pF  
3865 TA01a  
3865f  
ꢀ
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中文翻译

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