QUIESCENT CURRENT vs POWER SUPPLY

100.5

100.0

99.5

99.0

98.5

98.0

1.5

Power Supply (V)

2.5

3.5

4.5

5.5

R

1

Q

2

Q

N

+

Vbe

1

-

+

Vbe

2

-

V

BANDGAP

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10

REF3112-Q1, REF3120-Q1, REF3125-Q1

REF3130-Q1, REF3133-Q1, REF3140-Q1

SBVS299 – APRIL 2017

www.ti.com

Product Folder Links: REF3112-Q1 REF3120-Q1 REF3125-Q1 REF3130-Q1 REF3133-Q1 REF3140-Q1

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Copyright © 2017, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The REF31xx-Q1 is a family of series, CMOS, precision bandgap voltage references. The basic bandgap

of temperature. The curvature of the bandgap voltage, as shown in Figure 3, is due to the slightly nonlinear

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Supply Voltage

The REF31xx-Q1 family of references features an extremely low dropout voltage. With the exception of the

REF3112, which has a minimum supply requirement of 1.8 V, these references can be operated with a supply of

only 5 mV above the output voltage in an unloaded condition. For loaded conditions, a typical dropout voltage

versus load is shown in Typical Characteristics.

The REF31xx-Q1 features a low quiescent current that is extremely stable over changes in both temperature and

supply. The typical room temperature quiescent current is 100 μA, and the maximum quiescent current over

temperature is just 135 μA. The quiescent current typically changes less than 2 μA over the entire supply range,

as shown in Figure 20.

Figure 20. Supply Current vs Supply Voltage