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LTM4608A
OPERATION
V OUT = 0.596V ?
With current mode control and internal feedback loop
compensation, the LTM4608A module has sufficient
stability 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 thermal shutdown in an overcurrent condition.
Internal overvoltage and undervoltage comparators pull
the open-drain PGOOD output low if the output feedback
voltage exits a ±10% window around the regulation point.
Pulling the RUN pin below 1.3V forces the controller into
its shutdown state, by turning off both M1 and M2 at low
load current. The TRACK pin is used for programming the
output voltage ramp and voltage tracking during start-up.
See Applications Information.
The LTM4608A is internally compensated to be stable
over all operating conditions. Table 3 provides a guideline
for input and output capacitances for several operating
APPLICATIONS INFORMATION
The typical LTM4608A application circuit is shown in
Figure 18. External component selection is primarily
determined by the maximum load current and output
voltage. Refer to Table 3 for specific external capacitor
requirements for a particular application.
V IN to V OUT Step-Down Ratios
There are restrictions in the maximum V IN to V OUT step-
down ratio that can be achieved for a given input voltage.
The LTM4608A is 100% duty cycle, but the V IN to V OUT
minimum dropout is a function of its load current. Please
refer to the curves in the Typical Performance Charac-
teristics section of this data sheet for more information.
Output Voltage Programming
The PWM controller has an internal 0.596V reference
voltage. As shown in the Block Diagram, a 10k 0.5%
internal feedback resistor connects V OUT and FB pins
together. The output voltage will default to 0.596V with
conditions. The Linear Technology μModule Power Design
Tool is provided for transient and stability analysis. The
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 and phase mode controls. Up to 12 phases
can be cascaded to run simultaneously with respect to
each other by programming the PHMODE pin to different
levels. The LTM4608A has clock in and clock out for poly
phasing multiple devices or frequency synchronization.
High efficiency at light loads can be accomplished with
selectable Burst Mode operation using the MODE pin. These
light load features will accommodate battery operation.
Efficiency graphs are provided for light load operation in
the Typical Performance Characteristics.
Output voltage margining is supported, and can be pro-
gramed from ±5% to ±15% using the MGN and BSEL pins.
The PGOOD pin is disabled during margining
no feedback resistor. Adding a resistor R FB from FB pin
to GND programs the output voltage:
10k + R FB
R FB
Table 2. R FB Resistor vs Output Voltage
V OUT 0.596V 1.2V 1.5V 1.8V 2.5V 3.3V
R FB Open 10k 6.65k 4.87k 3.09k 2.21k
Input Capacitors
The LTM4608A module should be connected to a low AC
impedance DC source. Three 10μF ceramic capacitors
are included inside the module. Additional input capaci-
tors are only needed if a large load step is required up to
the 4A level. A 47μF to 100μF surface mount aluminum
electrolytic bulk capacitor can be used for more input bulk
capacitance. This bulk input capacitor is only needed if
the input source impedance is compromised by long in-
ductive leads, traces or not enough source capacitance.
4608afd
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