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LTM4606

4606f

APPLICATIONS INFORMATION

Thermal Considerations and Output Current Derating

In different applications, LTM4606 operates in a variety

of thermal environments. The maximum output current is

limited by the environment thermal condition. Sufﬁcient

cooling should be provided to help ensure reliable opera-

tion. When the cooling is limited, proper output current

derating is necessary, considering ambient temperature,

airﬂow, input/output condition, and the need for increased

reliability.

The power loss curves in Figures 6 and 7 can be used

in coordination with the load current derating curves in

Figures 8 to 15 for calculating an approximate

θJA for the

module. The graphs delineate between no heat sink, and

a BGA heat sink. Each of the load current derating curves

will lower the maximum load current as a function of the

increased ambient temperature to keep the maximum junc-

tion temperature of the power module at 125°C maximum.

Each of the derating curves and the power loss curve that

corresponds to the correct output voltage can be used to

solve for the approximate

θJA of the condition. Each ﬁgure

has three curves that are taken at three different air ﬂow

conditions. Tables 3 and 4 provide the approximate

θJA

for Figures 8 to 15. A complete explanation of the thermal

characteristics is provided in the thermal application note

AN110.

Safety Considerations

The LTM4606 modules do not provide isolation from VIN to

VOUT. There is no internal fuse. If required, a slow blow fuse

Figure 6. 1.5V Power Loss

Figure 7. 3.3V Power Loss

Figure 8. No Heat Sink

Figure 9. BGA Heat Sink

Figure 10. No Heat Sink

Figure 11. BGA Heat Sink

OUTPUT CURRENT (A)

2.0

2.5

4606 F06

1.5

1.0

0.5

12V LOSS

5V LOSS

OUTPUT CURRENT (A)

2.0

2.5

4.0

3.5

4606 F07

1.5

1.0

0.5

3.0

24V LOSS

12V LOSS

AMBIENT TEMPERATURE (°C)

4606 F08

5VIN, 1.5VOUT, 0LFM

5VIN, 1.5VOUT, 200LFM

5VIN, 1.5VOUT, 400LFM

AMBIENT TEMPERATURE (°C)

4606 F09

5VIN, 1.5VOUT, 0LFM

5VIN, 1.5VOUT, 200LFM

5VIN, 1.5VOUT, 400LFM

AMBIENT TEMPERATURE (°C)

4606 F10

12VIN, 1.5VOUT, 0LFM

12VIN, 1.5VOUT, 200LFM

12VIN, 1.5VOUT, 400LFM

AMBIENT TEMPERATURE (°C)

4606 F11

12VIN, 1.5VOUT, 0LFM

12VIN, 1.5VOUT, 200LFM

12VIN, 1.5VOUT, 400LFM

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