R5

60kW

REF50xx

TEMP

V

OUT

GND

TRIM/NR

V

IN

aT

aT

(10 A

m

at+25 C)

°

R2

R1

R3

R4

10kW

1kW

1.2V

REF5010, REF5020, REF5025, REF5030

REF5040, REF5045, REF5050

www.ti.com

SBOS410G – JUNE 2007 – REVISED NOVEMBER 2015

9 Detailed Description

9.1 Overview

The REF50xx is family of low-noise, precision bandgap voltage references that are specifically designed for

excellent initial voltage accuracy and drift. See Functional Block Diagram for a simplified block diagram of the

REF50xx.

9.2 Functional Block Diagram

9.3 Feature Description

9.3.1 Temperature Monitoring

The temperature output terminal (TEMP, pin 3) provides a temperature-dependent voltage output with

approximately 60-k

Ω source impedance. As seen in Figure 8, the output voltage follows the nominal relationship:

(1)

This pin indicates general chip temperature, accurate to approximately ±15°C. Although it is not generally

suitable for accurate temperature measurements, it can be used to indicate temperature changes or for

temperature compensation of analog circuitry. A temperature change of 30°C corresponds to an approximate 79-

mV change in voltage at the TEMP pin.

The TEMP pin has high-output impedance (see Functional Block Diagram). Loading this pin with a low-

To avoid errors caused by low-impedance loading, buffer the TEMP pin output with a suitable low-temperature

drift op amp, such as the OPA333, OPA335, or OPA376, as shown in Figure 37.

Copyright © 2007–2015, Texas Instruments Incorporated

Submit Documentation Feedback

15

Product Folder Links: REF5010 REF5020 REF5025 REF5030 REF5040 REF5045 REF5050