Datasheet

LTM4644/LTM4644-1
1
Rev. F
For more information www.analog.com
n
Quad Output Step-Down µModule
®
Regulator with 4A
per Output
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Wide Input Voltage Range: 4V to 14V
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2.375V to 14V with External Bias
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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
A
= 60°C, 200 LFM,
No Heat Sink)
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±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
TYPICAL APPLICATION
FEATURES DESCRIPTION
Quad DC/DC µModule
Regulator with Configurable 4A Output Array
The LT M
®
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,
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.
LTM4644 LTM4644-1
Top Feedback Resistor
from V
OUT
-to-V
FB
(one resistor per channel)
Integrated
60.4k 0.5%
Resistor
External (to be added on
PCB)
Application General
Applications
To Interface with
PMBus power system
management supervisory
ICs such as the LTC2975
Configurable Output Array*
4A
4A
4A
4A
8A
4A
4A
12A
4A
16A
* Note 4
Click to view associated TechClip Videos.
1.5V Output Efficiency and
Power Loss (Each Channel)
APPLICATIONS
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Multirail Point of Load Regulation
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FPGAs, DSPs and ASICs Applications
4V to 14V Input, Quad 0.9V, 1V, 1.2V and 1.5V Output DC/DC µModule Regulator*
All registered trademarks and trademarks are the property of their respective owners.
4644 TA01a
V
IN1
SVIN1
RUN1
V
IN2
SVIN2
RUN2
V
IN3
SVIN3
RUN3
V
IN4
SVIN4
RUN4
SGND
LTM4644
CLKIN
22µF
×2
16V
CLKOUT
TEMP GND
V
OUT1
FB1
PGOOD1
V
OUT2
FB2
PGOOD2
V
OUT3
FB3
PGOOD3
V
OUT4
FB4
PGOOD4
47µF
4V
1.5V/4A4V to 14V
40.2k
47µF
4V
1.2V/4A
60.4k
47µF
4V
1V/4A
90.9k
47µF
4V
0.9V/4A
121k
*T
A
= 60°C, 200LFM, NO HEAT SINK
LOAD CURRENT (A)
0
55
EFFICIENCY (%)
POWER LOSS (W)
75
80
85
95
1
4644 TA01b
70
65
60
90
0
0.5
1
2
1.5
42 3
V
IN
= 5V
V
IN
= 12V
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