LTM4618_15 Datasheet, PDF (1/24 Pages) Linear Technology – 6A DC/DC Module Regulator with Tracking and Frequency Synchronization

LTM4618
6A DC/DC µModule
Regulator with Tracking and
Frequency Synchronization
FEATURES
DESCRIPTION
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}
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 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
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
4618fa
1