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LTM4618
OPERATION
Power Module Description
The LTM4618 is a standalone non-isolated switching mode
DC/DC power supply. It can deliver up to 6A (DC current)
output with few external input and output capacitors. This
module provides precisely regulated output voltages pro-
grammable via external resistors from 0.8VDC to 5.0VDC
over 4.5V to 26.5V input voltages. The typical application
schematic is shown in Figure 21. For ≤6V inputs, connect
V IN , INTV CC and EXTV CC together.
The LTM4618 has an integrated constant frequency current
mode regulator and built-in power MOSFET devices with
fast switching speed. The typical switching frequency is
750kHz.
With current mode control and internal feedback loop
compensation, the LTM4618 module has suf?cient stabil-
ity margins and good transient performance with a wide
range of output capacitors, even with all ceramic output
capacitors.
Current mode control provides cycle-by-cycle fast current
limit and current foldback in a short-circuit condition. Pull-
ing the RUN pin below 1.1V forces the controller into its
shutdown state, by turning off both MOSFETs. The TK/SS
pin can be used for programming the output voltage ramp
and voltage tracking during start-up. See the Applications
Information section.
The LTM4618 is internally compensated to be stable over
all operating conditions. LTpowerCAD? is provided for
transient and stability analysis. The V FB pin is used to
program the output voltage with a single external resistor
to ground. Multiphase operation can be easily employed
with the synchronization control.
High ef?ciency at light loads can be accomplished with
selectable Burst Mode or pulse-skipping mode operations
using the MODE/PLLIN pin. Ef?ciency graphs are provided
for light load operation in the Typical Performance Char-
acteristics section.
4618fa
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