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LTC3615MPUF

更新时间： 2024-11-21 12:05:03
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
32页 527K
描述
Dual 4MHz, 3A Synchronous Step-Down DC/DC Converter

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中文翻译

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LTC3615MPUF 数据手册

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LTC3615/LTC3615-1  
Dual 4MHz, 3A Synchronous  
Step-Down DC/DC Converter  
DescripTion  
FeaTures  
The LTC®3615/LTC3615-1 are dual 3A synchronous step-  
downregulatorsusingacurrentmode,constant-frequency  
architecture. The DC supply current is only 130µA (Burst  
Mode operation at no-load) while maintaining the output  
voltages, droppingtozerocurrentinshutdown. The2.25V  
to 5.5V input supply range makes the parts ideally suited  
for single Li-Ion applications. 100% duty cycle capability  
provides low dropout operation, which extends operating  
time in battery-operated systems.  
n
High Efficiency: Up to 94%  
n
Dual Outputs with 2 × 3A Output Current Capability  
Low Output Ripple Burst Mode® Operation:I = 130µA  
n
Q
n
2.25V to 5.5V Input Voltage Range  
n
1% Output Voltage Accuracy  
n
Output Voltages Down to 0.6V  
n
Programmable Slew Rate at Switch Pins  
n
Low Dropout Operation: 100% Duty Cycle  
n
Shutdown Current ≤1µA  
n
Adjustable Switching Frequency Up to 4MHz  
The operating frequency is externally programmable up to  
4MHz, allowing the use of small surface mount inductors.  
0°, 90°, or 180° (LTC3615) or 140°/180° (LTC3615-1) of  
phase shift between the two channels can be selected to  
minimizeinputcurrentrippleandoutputvoltagerippleina  
dual 3A or single 6A output configuration. Programmable  
slew rate limiting reduces EMI, and external synchroniza-  
n
Internal or External Compensation  
n
Selectable Pulse-Skipping/Forced Continuous/  
Burst Mode Operation with Adjustable Burst Clamp  
n
Optional Active Voltage Positioning (AVP) with  
Internal Compensation  
n
Selectable 0°/90°/180° (LTC3615) or selectable  
140°/180° (LTC3615-1) Phase Shift Between Channels  
Fixed Internal and Programmable External Soft-Start  
Accurate Start-Up Tracking Capability  
tion can be applied up to 4MHz.  
n
n
n
n
The internal synchronous switches increase efficiency  
and eliminate the need for external catch diodes, saving  
external components and board space.  
DDR Memory Mode I  
= 1.5A  
OUT  
Available in4mm ×4mm QFN-24 and TSSOP-24Packages  
The LTC3615/LTC3615-1 are offered in leadless 24-pin  
4mm × 4mm QFN and thermally enhanced 24-pin TSSOP  
packages.  
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners. Protected by U.S. Patents, including 5481178, 5994885, 6304066, 6498466, 6580258,  
6611131.  
applicaTions  
n
Point-of-Load Supplies  
n
Distributed Power Supplies  
n
Portable Computer Systems  
DDR Memory Termination  
n
n
Handheld Devices  
Efficiency and Power Loss vs Load Current  
Typical applicaTion  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
10  
V
IN  
100µF  
SV  
IN  
RUN1  
PV  
PV  
IN2  
SW1  
0.47µH  
0.47µH  
IN1  
V
1
OUT1  
1.8V/3A  
TRACK/SS1  
PGOOD1  
ITH1  
47µF  
422k  
210k  
0.1  
LTC3615  
FB1  
SRLIM  
R /SYNC  
T
0.01  
0.001  
0.0001  
MODE  
V
OUT2  
2.5V/3A  
SW2  
PHASE  
47µF  
RUN2  
665k  
210k  
V
V
V
= 3.3V  
= 4V  
= 5V  
IN  
IN  
IN  
TRACK/SS2  
PGOOD2  
2.25MHz  
= 2.5V  
FB2  
V
OUT  
ITH2 SGND PGND  
0.001  
0.01  
0.1  
1
3615 TA01a  
OUTPUT CURRENT (A)  
3615 TA01b  
3615fb  
1
For more information www.linear.com/LTC3615  
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