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LTM4605
OPERATION
Power Module Description
The LTM4605 is a non-isolated buck-boost DC/DC power
supply. It can deliver a wide range output voltage from
0.8V to 16V over a wide input range from 4.5V to 20V,
by only adding the sensing resistor, inductor and some
external input and output capacitors. It provides precisely
regulated output voltage programmable via one external
resistor. The typical application schematic is shown in
Figure 16.
The LTM4605 has an integrated current mode buck-boost
controller, ultralow R DS(ON) FETs with fast switching speed
and integrated Schottky diodes. With current mode control
and internal feedback loop compensation, the LTM4605
module has suf?cient stability margins and good transient
performance under a wide range of operating conditions
and with a wide range of output capacitors. The operating
frequency of the LTM4605 can be adjusted from 200kHz
to 400kHz by setting the voltage on the PLLFLTR pin.
APPLICATIONS INFORMATION
Alternatively, its frequency can be synchronized by the
input clock signal from the PLLIN pin. The typical switch-
ing frequency is 400kHz.
The Burst Mode and skip-cycle mode operations can
be enabled at light loads in the LTM4605 to improve its
ef?ciency, while the forced continuous mode and discon-
tinuous mode operations are used for constant frequency
applications. Foldback current limiting is activated in an
overcurrent condition as V FB drops. Internal overvoltage
and undervoltage comparators pull the open-drain PGOOD
output low if the output feedback voltage exits the ±10%
window around the regulation point. Pulling the RUN pin
below 1.6V forces the controller into its shutdown state.
If an external bias supply is applied on the EXTV CC pin, then
an ef?ciency improvement will occur due to the reduced
power loss in the internal linear regulator. This is especially
true at the higher input voltage range.
The typical LTM4605 application circuit is shown in
Figure 16. External component selection is primarily
determined by the maximum load current and output
voltage. Refer to Table 3 for speci?c external capacitor
requirements for a particular application.
Output Voltage Programming
Table 1. R FB Resistor (0.5%) vs Various Output Voltages
V OUT 0.8V 1.5V 2.5V 3.3V 5V
R FB Open 115k 47.5k 32.4k 19k
V OUT 8V 9V 10V 12V 15V
R FB 11k 9.76k 8.66k 7.15k 5.62k
6V
15.4k
16V
5.23k
The PWM controller has an internal 0.8V reference voltage.
As shown in the Block Diagram, a 100k, internal feedback
resistor connects V OUT and V FB pins together. Adding a
resistor R FB from the V FB pin to the SGND pin programs
the output voltage:
Operation Frequency Selection
The LTM4605 uses current mode control architecture at
constant switching frequency, which is determined by the
internal oscillator’s capacitor. This internal capacitor is
charged by a ?xed current plus an additional current that
V OUT = 0.8V ?
100k + R FB
R FB
is proportional to the voltage applied to the PLLFLTR pin.
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