7 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

7.1 Application Information

Typical connections for the REF1112 are shown in Figure 7-1. A minimum 1μA bias current is required to

maintain a stable output voltage and can be provided with a resistor connected to the supply voltage. IBIAS

depends on the values selected for RBIAS and VS, and varies as a sum of the minimum operating current and

the load current. To maintain stable operation, the value of RBIAS must be low enough to maintain the minimum

operating current at the minimum and maximum load and supply voltage levels.

A 0.1μF load capacitor is recommended to maintain stability under varying load conditions. A minimum 0.01μF

load capacitor is required for stable operation. Start-up time for the REF1112 is be affected, depending on

the value of load capacitance and the bias currents being used. A 1μF power-supply bypass capacitor is

recommended to minimize supply noise within the circuit. The REF1112 shunt voltage reference provides a

versatile function for low power and space-conservative applications.

7.2 Typical Applications

7.2.1 Shunt Regulator

I

BIAS

= I

REF

+ I

LOAD

V

S

V

REF

R

BIAS

I

LOAD

I

BIAS

=

V

S

− V

REF

R

BIAS

0.1 F

μ

I

REF

1 F

μ

Figure 7-1. Typical Connections

7.2.1.1 Design Requirements

Table 7-1. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Supply voltage

3V

Cathode current (IREF)

1.2µA

Load Current (ILOAD)

50uA

REF1112

SBOS283E – SEPTEMBER 2003 – REVISED DECEMBER 2024

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