6 Detailed Description

6.1 Overview

The REF1112 is a 2-terminal bandgap reference diode designed for high accuracy with outstanding temperature

characteristics at low operating currents. Precision thin-film resistors result in 0.2% initial voltage accuracy and

50ppm/°C maximum temperature drift. The REF1112 is specified from –40°C to +85°C, with operation from

–40°C to +125°C, and is offered in a SOT23-3 package.

6.2 Functional Block Diagram

6.3 Feature Description

The REF1112 device is effectively a precision Zener diode. The part requires a small quiescent current for

regulation, and regulates the output voltage by shunting more or less current to ground, depending on input

voltage and load. The only external component requirement are an resistor between the cathode and the input

voltage to set the input current and an external capacitor at the output to maintain stability under varying loads.

6.4 Device Functional Modes

The REF1112 device is a fixed output voltage part where the feedback is internal. Therefore, the part can

only operate in a closed-loop mode and the output voltage cannot be adjusted. The output voltage remains

in regulation as long as IREF is between IREFMIN (see Electrical Characteristics) and IREFMAX is 5mA. A proper

selection of the external resistor for input voltage range and load current range maintains that these conditions

are met.

www.ti.com

REF1112

SBOS283E – SEPTEMBER 2003 – REVISED DECEMBER 2024

Copyright © 2024 Texas Instruments Incorporated

Submit Document Feedback

7

Product Folder Links: REF1112