The tracking accuracy is as shown in Figure 9-1.

-0.05

-0.04

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

0.04

0.05

±75

±50

±25

0

25

50

75

100

125

150

Temperature (ƒC)

C001

VREF

V

BIAS

Figure 9-1. VREF and VBIAS Tracking vs Temperature

9.3.2 Low Temperature Drift

The REF20xx is designed for minimal drift error, which is defined as the change in output voltage over

temperature. The drift is calculated using the box method, as described by Equation 3:

REF(MAX)

REF(MIN)

6

REF

V

V

Drift

10

(ppm)

V

Temperature Range

§

·

x

¨

¸

x

©

¹

(3)

9.3.3 Load Current

The REF20xx family is specified to deliver a current load of ±20 mA per output. Both the VREF and VBIAS outputs

of the device are protected from short circuits by limiting the output short-circuit current to 50 mA. The device

temperature increases according to Equation 4:

‡

J

A

D

-$

T

T

P

R

(4)

where

• TJ = junction temperature (°C),

• TA = ambient temperature (°C),

• PD = power dissipated (W), and

• RθJA = junction-to-ambient thermal resistance (°C/W)

The REF20xx maximum junction temperature must not exceed the absolute maximum rating of 150°C.

9.4 Device Functional Modes

When the EN pin of the REF20xx is pulled high, the device is in active mode. The device should be in active

mode for normal operation. The REF20xx can be placed in a low-power mode by pulling the ENABLE pin low.

When in shutdown mode, the output of the device becomes high impedance and the quiescent current of the

device reduces to 5 µA in shutdown mode. See the Section 7.5 for logic high and logic low voltage levels.

REF2025, REF2030, REF2033, REF2041

SBOS600E – JULY 2018 – REVISED FEBRUARY 2022

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