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LTM4619
Dual, 26V IN , 4A DC/DC
μModule Regulator
FEATURES
DESCRIPTION
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Complete Standalone Power Supply
Wide Input Voltage Range: 4.5V to 26.5V
(EXTV CC Available for V IN ≤ 5.5V)
Dual 180° Out-of-Phase Outputs with 4A DC
Typical, 5A Peak Output Current for Each
Dual Outputs with 0.8V to 5V Range
Output Voltage Tracking
±1.5% Maximum Total DC Output Error
Current Mode Control/Fast Transient Response
Power Good
Phase-Lockable Fixed Frequency 250kHz to 780kHz
On Board Frequency Synchronization
Parallel Current Sharing
Selectable Burst Mode ? Operation
Output Overvoltage Protection
15mm × 15mm × 2.82mm LGA Package
The LTM ? 4619 is a complete dual 4A or single 8A step-
down DC/DC μModule ? (micromodule) regulator. Included
in the package are the switching controller, power FETs,
inductor, and all support components. Operating over
input voltage ranges of 4.5V to 26.5V, the LTM4619 sup-
ports two outputs with voltage ranges of 0.8V to 5V, each
set by a single external resistor. Its high efficiency design
delivers 4A continuous current (5A peak) for each output.
High switching frequency and a current mode architecture
enable a very fast transient response to line and load
changes without sacrificing stability. The two outputs
are interleaved with 180° phase to minimize the ripple
noise and reduce the I/O capacitors. The device supports
frequency synchronization and output voltage tracking for
supply rail sequencing. Burst Mode operation or pulse-
skipping mode can be selected for light load operations.
Telecom and Networking Equipment
Servers
Storage Cards
ATCA Cards
Industrial Equipment
Point of Load Regulation
APPLICATIONS
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L , LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and μModule are registered
trademarks and LTpowerCAD is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
Dual 4A 3.3V/2.5V DC/DC μModule Regulator
Fault protection features include overvoltage protection,
overcurrent protection and foldback current limit for
short-circuit protection.
The low profile package (2.82mm) enables utilization of
unused space on the bottom of PC boards for high density
point of load regulation. The power module is offered in
a 15mm × 15mm × 2.82mm LGA package. The LTM4619
is RoHS compliant with Pb-free finish.
Efficiency and Power Loss at 12V input
95
2.0
5.5V TO 26.5V
10μF
× 2
28k
22pF
MODE/PLLIN INTV CC
V IN FREQ/PLLFLTR
V FB1 V FB2
COMP1 COMP2
19.1k
22pF
90
85
80
EFFICIENCY
1.5
V OUT1
2.5V/4A
100μF
0.1μF
V OUT1
TK/SS1
RUN1
LTM4619
V OUT2
TK/SS2
RUN2
0.1μF
100μF
V OUT2
3.3V/4A
75
70
65
POWER LOSS
1.0
0.5
PGOOD
SGND
PGND
EXTV CC
4619 TA01a
60
55
0
0.5
1
1.5
2
2.5
3
2.5V OUT
3.3V OUT
3.5
4
0
LOAD CURRENT (A)
4619 TA01b
4619fb
For more information www.linear.com/LTM4619
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