Data Sheet

LT3046

analog.com

Rev 0

33 of 47

In addition, more than two LT3046 devices can be paralleled for even higher output current and lower output noise.

Paralleling multiple LT3046 devices is also useful for distributing heat on the PCB. For applications with high input-

to-output voltage differential, an input series resistor or resistor in parallel with the LT3046 can also be used to

spread heat.

PCB Layout Considerations

Given the high bandwidth and ultra-high PSRR of the LT3046, careful PCB layout must be employed to achieve full

device performance. Figure 74 shows the LT3046EVK#DFN evaluation board with a layout that delivers the full

performance of the regulator. Refer to the LT3046 evaluation board user guide (LT3046EVK#DFN) for further details.

Figure 74. LT3046EVK#DFN Evaluation Board

Thermal Considerations

The LT3046 has internal power and thermal limiting circuits that protect the device under overload conditions. The

thermal shutdown temperature is nominally +165°C with about 6°C of hysteresis. For continuous normal load

conditions, do not exceed the maximum junction temperature, +125°C. It is important to consider all sources of

thermal resistance from junction to ambient, which includes junction to case, case to heatsink interface, heatsink

resistance, or circuit board to ambient as the application dictates. Additionally, consider all heat sources close to

the LT3046.