5

REF1112

SBOS283

www.ti.com

0.1

µF

3V

R

LOAD

V

0.1

µF

R

SET

I

V

S

V

REF

R

BIAS

I

LOAD

I

V

R

BIAS

0.1

µF

I

REF

1

µF

APPLICATIONS INFORMATION

The REF1112 is a two-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.

Typical connections for the REF1112 are shown in Figure 1.

A minimum 1

µA bias current is required to maintain a stable

output voltage and can be provided with a resistor con-

minimum operating current and the load current. To main-

enough to maintain the minimum operating current at the

minimum and maximum load and supply voltage levels.

.

FIGURE 3. MicroPOWER 3

µA 1V Voltage Reference.

FIGURE 4. 2.5V Reference on 1

µA.

V

S

I

SET

0.1

µF

R

SET

10k

Ω

I

V

REF

R

SET

FIGURE 2. REF1112 Provides a Stable Current Source.

FIGURE 1. Typical Connections.

A 0.1

µF load capacitor is recommended to maintain stabil-

ity under varying load conditions. A minimum 0.01

µF load

capacitor is required for stable operation. Start-up time for

the REF1112 will be affected, depending on the value of

load capacitance and the bias currents being used. A 1

µF

power supply bypass capacitor is recommended to mini-

mize supply noise within the circuit.

The REF1112 shunt voltage reference provides a versatile

function for low power and space-conservative applications.

The REF1112 can be configured with an additional diode

and NPN transistor to provide a temperature compensated

current reference as shown in Figure 2. The REF112 can be

scaled to provide extremely low power reference voltages.

Figure 3 shows the REF1112 used as a 1V out, 3

µA voltage

reference, and in Figure 4 a 2.5V reference on 1

µA.

0.1

µF

3V

3V

V

REF

V

795k

Ω

250k

Ω

1M

Ω

REF1112

TLV2401