Linear ANALOG DEVICES LTM4644EY PBF Series Manual

Regulator with Configurable 4A Output Array
FEATURES
Quad Output Step-Down µModule
n
per Output
Wide Input Voltage Range: 4V to 14V
n
2.375V to 14V with External Bias
n
0.6V to 5.5V Output Voltage
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4A DC, 5A Peak Output Current Each Channel
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Up to 5.5W Power Dissipation (T
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No Heat Sink)
±1.5% Total Output Voltage Regulation
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Current Mode Control, Fast Transient Response
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Parallelable for Higher Output Current
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Output Voltage Tracking
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Internal Temperature Sensing Diode Output
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External Frequency Synchronization
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Overvoltage, Current and Temperature Protection
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9mm × 15mm × 5.01mm BGA Package
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APPLICATIONS
Multirail Point of Load Regulation
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FPGAs, DSPs and ASICs Applications
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TYPICAL APPLICATION
4V to 14V Input, Quad 0.9V, 1V, 1.2V and 1.5V Output DC/DC µModule Regulator*
V
4V to 14V
IN1
22µF
SVIN1
×2
RUN1
16V
V
IN2
SVIN2
RUN2
V
IN3
SVIN3
RUN3
V
IN4
SVIN4
RUN4
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Regulator with 4A
®
= 60°C, 200 LFM,
A
CLKIN CLKOUT
V
OUT1
FB1
PGOOD1
40.2k
LTM4644
V
OUT2
FB2
PGOOD2 60.4k
V
OUT3
FB3
PGOOD3
90.9k
V
OUT4
FB4
PGOOD4 121k
TEMP SGND GND
4644 TA01a
*T = 60°C, 200LFM, NO HEAT SINK
A
For more information
LTM4644/LTM4644-1
Quad DC/DC µModule
DESCRIPTION
The LTM 4644/LTM4644-1
®
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,
power FETs, inductors and support components. 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.
Top Feedback Resistor
from V -to-V
OUT FB
(one resistor per channel)
Application
Configurable Output Array*
4A
8A
4A
4A 4A
4A 4A
* Note 4
Click to view associated TechClip Videos.
95
1.5V/4A
47µF
90
4V
85
1.2V/4A
80
47µF
4V
75
70
1V/4A
47µF
65
4V
60
0.9V/4A
55
47µF
0
4V
www.analog.com
is a quad DC/DC step-down
LTM4644 LTM4644-1
Integrated External (to be added on
60.4k 0.5% PCB)
Resistor
General To Interface with
Applications PMBus power system
management supervisory
ICs such as the
12A
4A
1.5V Output Efficiency and
Power Loss (Each Channel)
V = 5V
IN
V = 12V
IN
1 2 3 4
LOAD CURRENT (A)
4644 TA01b
LTC2975
16A
2
1.5
1
0.5
0
Rev. G
1