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LTM4619
OPERATION
The LTM4619 is a dual-output standalone non-isolated
switching mode DC/DC power supply. It can deliver up to
4A (DC current) for each output with few external input and
output capacitors. This module provides precisely regulated
output voltages programmable 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 18.
The LTM4619 has integrated constant frequency current
mode regulators and built-in power MOSFET devices with
fast switching speed. The typical switching frequency is
780kHz. To reduce switching noise, the two outputs are
interleaved with 180° phase internally and can be synchro-
nized externally using the MODE/PLLIN pin.
With current mode control and internal feedback loop
compensation, the LTM4619 module has sufficient 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.
Internal overvoltage and undervoltage comparators pull
the open-drain PGOOD output low if the output feedback
voltage exits a ±7.5% window around the regulation point.
The power good pin is disabled during start-up.
Pulling the RUN pin below 1.2V forces the controller into
its shutdown state, by turning off both MOSFETs. The
TK/SS pin is used for programming the output voltage
ramp and voltage tracking during start-up. See the Ap-
plications Information section.
The LTM4619 is internally compensated to be stable over
all operating conditions. LTpowerCAD? is available 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.
High efficiency at light loads can be accomplished with
selectable Burst Mode operation or pulse-skipping mode
using the MODE/PLLIN pin. Efficiency graphs are provided
for light load operations in the Typical Performance Char-
acteristics section.
4619fb
8
For more information www.linear.com/LTM4619
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