LTM4618 Datasheet, PDF (1/24 Pages) Linear Technology – 6A DC/DC μModule Regulator with Tracking and Frequency Synchronization

LTM4618
6A DC/DC µModule
Regulator with Tracking and
Frequency Synchronization
FEATURES
n _{Complete Standalone Power Supply}
n _{Wide Input Voltage Range: 4.5V to 26.5V}
n _{6A DC Typical, 8A Peak Output Current}
n _{0.8V to 5V Output}
n _{Output Voltage Tracking}
n _{±1.75% Maximum Total DC Error}
n _{Current Mode Control/Fast Transient Response}
n _{Phase-Lockable Fixed Frequency 250kHz to 780kHz}
n _{On-Board Frequency Synchronization}
n _{Selectable Burst Mode}^® _Operation
n _{Power Good Voltage Indicator}
n _{Output Overvoltage Protection}
n _{Output Current Foldback Limiting}
n _{9mm × 15mm × 4.32mm LGA Package}
APPLICATIONS
n _{Telecom and Networking Equipment}
n _Servers
n _{Storage Cards}
n _{ATCA Cards}
n _{Industrial Equipment}
n _{Point of Load Regulation}
n _{Medical Systems}
DESCRIPTION
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 efficiency
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 sacrificing 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.
Fault protection features include overvoltage protection,
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 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
V_IN
6V to 26.5V
C_IN
0.1μF
MODE/PLLIN INTV_CC EXTV_CC
V_IN
FREQ
COMP
TK/SS
LTM4618
V_OUT
V_FB
RUN
SGND
PGOOD
PGND
4618 TA01
28.7k
V_OUT
2.5V/6A
C_OUT
Efficiency and Power Loss vs Load Current
95
3.0
EFFICIENCY
90
2.5
2.0
85
1.5
80
1.0
POWER LOSS
75
0.5
12V_IN TO 2.5V_OUT
24V_IN TO 2.5V_OUT
70
0
0
1
2
3
4
5
6
LOAD CURRENT (A)
4618 TA01b
4618f
1