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LTM4608
APPLICATIONS INFORMATION
Slope Compensation
The module has already been internally compensated for
all output voltages. Table 3 is provided for most application
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 LTM4608’s
output, the user can program the LTM4608’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 regu-
lation point. The amount of output voltage margining is
4.0
3.5
3.0
2.5
2.0
1.5
1.0
determined by the BSEL pin. When BSEL is low, it is 5%.
When BSEL is 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 remains 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)
4608 F07
Figure 7. 3.3V IN , 2.5V and 1.5V OUT Power Loss
LOAD CURRENT (A)
4608 F08
Figure 8. 5V IN , 3.3V and 1.5V OUT Power Loss
4608fd
17
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