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LTM4644EY#PBF

更新时间： 2024-01-25 22:58:08
品牌 Logo 应用领域
凌特 - Linear 稳压器
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36页 815K
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LTM4644/LTM4644-1  
Quad DC/DC µModule  
Regulator with Configurable 4A Output Array  
FEATURES  
DESCRIPTION  
Quad Output Step-Down µModule® Regulator with 4A  
per Output  
The LTM®4644/LTM4644-1 is a quad DC/DC step-down  
µModule (micromodule) regulator with 4A per output.  
Outputs can be paralleled in an array for up to 16A capabil-  
ity. Included in the package are the switching controllers,  
powerFETs,inductorsandsupportcomponents.Operating  
over an input voltage range of 4V to 14V or 2.375V to 14V  
with an external bias supply, the LTM4644/LTM4644-1  
supports an output voltage range of 0.6V to 5.5V. Its  
high efficiency design delivers 4A continuous (5A peak)  
output current per channel. Only bulk input and output  
capacitors are needed.  
n
n
Wide Input Voltage Range: 4V to 14V  
n
2.375V to 14V with External Bias  
n
n
n
0.6V to 5.5V Output Voltage  
4A DC, 5A Peak Output Current Each Channel  
Up to 5.5W Power Dissipation (T = 60°C, 200 LFM,  
A
No Heat Sink)  
n
n
n
n
n
n
n
n
1.5ꢀ Total Output Voltage Regulation  
Current Mode Control, Fast Transient Response  
Parallelable for Higher Output Current  
Output Voltage Tracking  
Internal Temperature Sensing Diode Output  
External Frequency Synchronization  
Overvoltage, Current and Temperature Protection  
9mm × 15mm × 5.01mm BGA Package  
LTM4644  
LTM4644-1  
Top Feedback Resistor  
from V -to-V  
Integrated  
60.4k 0.5ꢀ  
External (to be added on  
PCB)  
OUT  
FB  
(one resistor per channel) Resistor  
Application  
General  
Applications  
To Interface with  
PMBus power system  
management supervisory  
ICs such as the LTC2975  
APPLICATIONS  
n
Multirail Point of Load Regulation  
FPGAs, DSPs and ASICs Applications  
Configurable Output Array*  
n
4A  
4A  
8A  
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and PolyPhase are registered  
trademarks and LTpowerCAD is a trademark of Linear Technology Corporation. All other  
trademarks are the property of their respective owners.  
12A  
16A  
4A  
4A  
4A  
4A  
4A  
* Note 4  
Click to view associated TechClip Videos.  
TYPICAL APPLICATION  
4V to 14V Input, Quad 0.9V, 1V, 1.2V and 1.5V Output DC/DC µModule Regulator*  
1.5V Output Efficiency and  
Power Loss (Each Channel)  
CLKIN  
CLKOUT  
95  
90  
85  
80  
75  
70  
65  
60  
55  
2
V
V
4V to 14V  
1.5V/4A  
IN1  
OUT1  
FB1  
22µF  
×2  
16V  
SVIN1  
RUN1  
47µF  
4V  
PGOOD1  
40.2k  
60.4k  
LTM4644  
1.5  
1
V
IN2  
V
1.2V/4A  
OUT2  
SVIN2  
RUN2  
FB2  
47µF  
4V  
PGOOD2  
V
IN3  
V
1V/4A  
OUT3  
SVIN3  
RUN3  
FB3  
47µF  
4V  
0.5  
0
PGOOD3  
90.9k  
121k  
V
V
= 5V  
IN  
IN  
V
IN4  
V
0.9V/4A  
= 12V  
OUT4  
SVIN4  
RUN4  
FB4  
47µF  
4V  
0
1
2
3
4
PGOOD4  
LOAD CURRENT (A)  
TEMP SGND GND  
4644 TA01b  
4644 TA01a  
*T = 60°C, 200LFM, NO HEAT SINK  
A
4644fd  
1
For more information www.linear.com/LTM4644  
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