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LTM4618
6A DC/DC μModule
Regulator with Tracking and
Frequency Synchronization
FEATURES
DESCRIPTION
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Complete Standalone Power Supply
Wide Input Voltage Range: 4.5V to 26.5V
6A DC Typical, 8A Peak Output Current
0.8V to 5V Output
Output Voltage Tracking
±1.75% Maximum Total DC Error
Current Mode Control/Fast Transient Response
Phase-Lockable Fixed Frequency 250kHz to 780kHz
On-Board Frequency Synchronization
Selectable Burst Mode ? Operation
Power Good Voltage Indicator
Output Overvoltage Protection
Output Current Foldback Limiting
9mm × 15mm × 4.32mm LGA Package
The LTM ? 4618 is a complete 6A output switching mode
DC/DC power supply in a 9mm × 15mm × 4.32mm LGA
package. Included in the package are the switching con-
troller, power FETs, inductor and all support components.
Operating over an input voltage range of 4.5V to 26.5V,
the LTM4618 supports an output voltage range of 0.8V
to 5V set by a single external resistor. Its high ef?ciency
design delivers 6A continuous current (8A peak). Only a
few input and output capacitors are needed.
High switching frequency and a current mode architecture
enable a very fast transient response to line and load
changes without sacri?cing stability. 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.
APPLICATIONS
Fault protection features include overvoltage protection,
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Telecom and Networking Equipment
Servers
Storage Cards
ATCA Cards
Industrial Equipment
Point of Load Regulation
Medical Systems
overcurrent protection and foldback current limit for
short-circuit protection.
The LTM4618 is Pb-free and RoHS compliant.
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
2.5V/6A DC/DC Power μModule ? with 6V to 26.5V Input
Ef?ciency and Power Loss vs Load Current
95
3.0
90
EFFICIENCY
2.5
V IN
6V to 26.5V
C IN
0.1μF
MODE/PLLIN INTV CC EXTV CC
V IN FREQ
COMP V OUT
LTM4618
TK/SS V FB
RUN PGOOD
28.7k
C OUT
V OUT
2.5V/6A
85
80
2.0
1.5
1.0
SGND
PGND
POWER LOSS
4618 TA01
75
12V IN TO 2.5V OUT
0.5
70
0
1
2
3
24V IN TO 2.5V OUT
4 5 6
0
LOAD CURRENT (A)
4618 TA01b
4618fa
1
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