LM137, LM337-N

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SNVS778D – MAY 1999 – REVISED APRIL 2013

SCHEMATIC DIAGRAM

Thermal Regulation

When power is dissipated in an IC, a temperature gradient occurs across the IC chip affecting the individual IC

circuit components. With an IC regulator, this gradient can be especially severe since power dissipation is large.

Thermal regulation is the effect of these temperature gradients on output voltage (in percentage output change)

per Watt of power change in a specified time. Thermal regulation error is independent of electrical regulation or

temperature coefficient, and occurs within 5 ms to 50 ms after a change in power dissipation. Thermal regulation

depends on IC layout as well as electrical design. The thermal regulation of a voltage regulator is defined as the

specification is 0.02%/W, max.

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