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LTM4615
OPERATION
LTM4615 POWER MODULE DESCRIPTION
Dual Switching Regulator Section
The LTM4615 is a standalone dual nonisolated switching
mode DC/DC power supply with an additional onboard
1.5A VLDO. It can deliver up to 4A of DC output current
for each channel with few external input and output ca-
pacitors. This module provides two precisely regulated
output voltages programmable via one external resistor
for each channel from 0.8V DC to 5V DC over a 2.375V
to 5.5V input voltage range. The VLDO is an independent
1.5A linear regulator that can be powered from either
switching converter. The typical application schematic is
shown in Figure 12.
The LTM4615 has two integrated constant frequency cur-
rent mode regulators, with built-in power MOSFETs with
fast switching speed. The typical switching frequency is
1.25MHz. With current mode control and internal feedback
loop compensation, these switching regulators have suf-
ficient stability margins and good transient performance
under a wide range of operating conditions, and with a
wide range of output capacitors, even all ceramic output
capacitors.
Current mode control provides cycle-by-cycle fast current
limit. Besides, current limiting is provided in an overcur-
rent condition with thermal shutdown. In addition, internal
overvoltage and undervoltage comparators pull the open-
drain PGOOD outputs low if the particular output feedback
voltage exits a ±7.5% window around the regulation point.
Furthermore, in an overvoltage condition, internal top FET,
M1, is turned off and bottom FET, M2, is turned on and
held on until the overvoltage condition clears, or current
limit is exceeded.
Pulling each specific RUN/SS pin below 0.8V forces the
specific regulator controller into its shutdown state, turn-
ing off both M1 and M2 for each power stage. At low load
current, each regulator works in continuous current mode
by default to achieve minimum output voltage ripple.
The TRACK pins are used for power supply tracking for
each specific regulator. See the Applications Information
section.
The LTM4615 is internally compensated to be stable over
the operating conditions. Table 4 provides a guideline
for input and output capacitance for several operating
conditions. The LTpowerCAD? Design Tool is provided
for transient and stability analysis.
The FB pins are used to program the specific output volt-
age with a single resistor to ground.
VLDO Section
The VLDO (very low dropout) linear regulator operates
from a 1.14V to 3.5V input. The VLDO uses an internal
NMOS transistor as the pass device in a source-follower
configuration. The BOOST3 pin is the output of an inter-
nal boost converter that supplies the higher supply drive
to the pass device for low dropout enhancement. The
internal boost converter operates on very low current,
thus optimizing high efficiency for the VLDO in close to
dropout operation.
An undervoltage lockout comparator on the LDO ensures
that the boost voltage is greater than 4.2V before enabling
the LDO, otherwise the LDO is disabled.
The LDO provides a high accuracy output capable of supply
1.5A of output current with a typical drop out of 100mV.
A single ceramic 10μF capacitor is all that is required
for output capacitor bypassing. A low reference voltage
allows the VLDO to have lower output voltages than the
commonly available LDO.
The device also includes current limit and thermal over-
load protection. The NMOS follower architecture has fast
transient response without the traditional high drive cur-
rents in dropout. The VLDO includes a soft-start feature
to prevent excessive current on the input during start-up.
When the VLDO is enabled, the soft-start circuitry gradu-
ally increases the reference voltage from 0V to 0.4V over
a period of approximately 200μs.
10
For more information www.linear.com/LTM4615
4615fb
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