LM4132 datasheet(21/44 Pages) TI2

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VHYS =

lVREF1 - VREF2l

VREF

x 10

6 ppm

-40

VREF1

Time

VREF2

125

LM4132, LM4132-Q1

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SNVS372G – AUGUST 2005 – REVISED OCTOBER 2016

Product Folder Links: LM4132 LM4132-Q1

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Feature Description (continued)

7.3.3 Thermal Hysteresis

Thermal hysteresis is defined as the change in output voltage at 25ºC after some deviation from 25ºC. This is to

say that thermal hysteresis is the difference in output voltage between two points in a given temperature profile.

An illustrative temperature profile is shown in Figure 47.

Figure 47. Temperature Profile

This may be expressed analytically by Equation 1:

where

•

VHYS = Thermal hysteresis expressed in ppm

•

VREF = Nominal preset output voltage

•

VREF1 = VREF before temperature fluctuation

•

VREF2 = VREF after temperature fluctuation

•

The LM4132 features a low thermal hysteresis of 75 ppm (typical) from –40°C to 125°C after 8 temperature

cycles.

(1)

7.4 Device Functional Modes

Table 1 describes the functional modes of the LM4132.

Table 1. Enable Pin Mode Summary

ENABLE PIN CONNECTION

LOGIC STATE

DESCRIPTION

EN = VIN

Normal operation — LM4132 starts up.

EN = GND

The LM4312 is in shutdown mode.

LM4132 Datasheet(PDF) 21 Page - Texas Instruments

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