TS39154

1.5A Ultra Low LDO with Enable

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Version: D08

Application Information (Continue)

Thermal Characteristics

TS39154 linear regulators are simple to use, the most complicated design parameters to consider are thermal

characteristics, thermal design requires the following application specification parameters:

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Calculate the power dissipation of the regulator from these numbers and the device parameters from this datasheet,

where the ground current is taken from data sheet.

The heat sink thermal resistance is determined by:

Where

applications where the minimum input voltage is know and is large compared with the dropout voltage and distribute

the heat between this resistor and the regulator. The low dropout properties of vertical PNP regulators allow

significant reductions in regulator power dissipation and the associated heat sink without compromising performance.

When this technique is employed, a capacitor of at least 1uF is needed directly between the input and regulator

ground.