J

A

D

JA

T

T

P

RT

˜

6

OUTMAX

OUTMIN

OUT

V

V

Drift

10 (ppm)

V

Temperature Range

æ

ö

-

=

×

ç

÷

×

è

ø

12

REF3312, REF3318, REF3320, REF3325, REF3330, REF3333

SBOS392H – AUGUST 2007 – REVISED AUGUST 2019

www.ti.com

Product Folder Links: REF3312 REF3318 REF3320 REF3325 REF3330 REF3333

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Copyright © 2007–2019, Texas Instruments Incorporated

Feature Description (continued)

9.3.2 Low Temperature Drift

The REF33xx is designed for minimal drift error, defined as the change in output voltage over temperature. The

drift is calculated using the box method, as described in Equation 2:

(2)

9.3.3 Power Dissipation

The REF33xx family is specified to deliver current loads of ±5 mA over the specified input voltage range. The

temperature of the device increases according to Equation 3:

where

•

TJ = junction temperature (°C).

•

TA = ambient temperature (°C).

•

PD = power dissipation (W) = VIN × IQ + (VIN – VOUT) IOUT.

•

RθJA = Junction-to-ambient thermal resistance (°C/W).

(3)

The REF33xx junction temperature must not exceed the absolute maximum rating of 150°C.

9.3.4 Noise Performance

Typical 0.1-Hz to 10-Hz voltage noise for each member of the REF33xx family is specified in the Electrical

Characteristics table. The noise voltage increases with output voltage and operating temperature. Use additional

filtering to improve output noise levels. Give special attention to ensure that the output impedance does not

degrade output voltage accuracy.

9.4 Device Functional Modes

The REF33xx is powered on when the voltage on the IN pin is greater than VOUT + 0.2 V, except for the

REF3312, where the minimum supply voltage is 1.7 V. The maximum input voltage for the REF33xx is 5.5 V.

Use a supply bypass capacitor ranging between 1 μF to 10 μF. The total capacitive load at the output must be

between 0.1 μF to 10 μF to ensure output stability.