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LTM4608A
APPLICATIONS INFORMATION
Slope Compensation
The module has already been internally compensated for
all output voltages. Table 3 is provided for most applica-
tion requirements. A spice model will be provided for other
control loop optimization. For single module operation,
connect I THM pin to SGND. For parallel operation, tie I THM
pins together and then connect to SGND at one point. Tie
I TH pins together to share currents evenly for all phases.
Output Margining
For a convenient system stress test on the LTM4608A’s
output, the user can program the LTM4608A’s output to
±5%, ±10% or ±15% of its normal operational voltage.
The margin pin with a voltage divider is driven with a small
three-state gate as shown in Figure 18, for the three margin
states (high, low, no margin). When the MGN pin is < 0.3V,
it forces negative margining in which the output voltage
is below the regulation point. When MGN is >V IN – 0.3V,
the output voltage is forced above the regulation point.
The amount of output voltage margining is determined by
the BSEL pin. When BSEL is low, it is 5%. When BSEL is
4.0
3.5
3.0
2.5
2.0
1.5
1.0
high, it is 10%. When BSEL is floating, it is 15%. When
margining is active, the internal output overvoltage and
undervoltage comparators are disabled and PGOOD re-
mains high. Margining is disabled by tying the MGN pin
to a voltage divider as shown in Figure 20.
Thermal Considerations and Output Current Derating
The power loss curves in Figures 7 and 8 can be used
in coordination with the load current derating curves in
Figures 9 to 16 for calculating an approximate θ JA for the
module with various heat sinking methods. Thermal models
are derived from several temperature measurements at
the bench, and thermal modeling analysis. Thermal Ap-
plication Note 103 provides a detailed explanation of the
analysis for the thermal models and the derating curves.
Tables 4 and 5 provide a summary of the equivalent θ JA
for the noted conditions. These equivalent θ JA parameters
are correlated to the measured values and improve with
air flow. The junction temperature is maintained at 125°C
or below for the derating curves.
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
2
4
3.3V IN 1.5V OUT
3.3V IN 2.5V OUT
6
8
0.5
0
0
2
4
5V IN 1.5V OUT
5V IN 3.3V OUT
6
8
LOAD CURRENT (A)
4608A F07
Figure 7. 3.3V IN , 2.5V and 1.5V OUT Power Loss
LOAD CURRENT (A)
4608A F08
Figure 8. 5V IN , 3.3V and 1.5V OUT Power Loss
4608afd
17
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