WM5102 datasheet(27/334 Pages) WOLFSON

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Production Data

WM5102

PD, June 2014, Rev 4.2

THERMAL CHARACTERISTICS

Thermal analysis should be performed in the intended application to ensure the WM5102 does not

exceed its thermal limits. Several contributing factors affect thermal performance, including the

physical properties of the mechanical enclosure, location of the device on the PCB in relation to

surrounding components and the number of PCB layers. Connecting the GND balls through thermal

vias and into a large ground plane will aid heat extraction.

Three main heat transfer paths exist to surrounding air as illustrated below in Figure 1:

Package top to air (radiation).

Package bottom to PCB (radiation).

Package balls to PCB (conduction).

Figure 1 Heat Transfer Paths

The temperature rise TR is given by TR = PD * ӨJA

PD is the power dissipated in the device.

ӨJA is the thermal resistance from the junction of the die to the ambient temperature

and is therefore a measure of heat transfer from the die to surrounding air. ӨJA is

determined with reference to JEDEC standard JESD51-9.

The junction temperature TJ is given by TJ = TA +TR, where TA is the ambient temperature.

PARAMETER

SYMBOL

MIN

TYP

MAX

UNIT

Operating temperature range

-40

°C

Operating junction temperature

-40

125

°C

Thermal Resistance

ӨJA

°C/W

Note: Junction temperature is a function of ambient temperature and of the device operating conditions. The ambient temperature

limits and junction temperature limits must both be observed.

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