Rev. 10/25/00

SPX3431

Micropower 2.5V Precision

Adjustable Shunt Regulator

FEATURES

APPLICATIONS

•

Voltage Tolerance ..................................0.5% & 1.0%

•

Battery Operating Equipment

•

Wide Operating Current .................... 1mA to 100mA

•

Adjustable Supplies

•

Extended Temperature Range .......................... 105

°°°°C

•

Switching Power Supplies

•

Low Temperature Coefficient ........................30 ppm/

°C

•

Error Amplifiers

•

Offered in SOT-23, TO-92 & SOT 89

•

Single Supply Amplifier

•

Low Output Noise

•

Monitors / VCR / TV

•

Personal Computers

PRODUCT DESCRIPTION

The SPX3431 is a 3-terminal Adjustable Shunt Voltage Regulator providing a highly accurate 0.5% bandgap reference. SPX3431 acts

as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX3431 thermal stability, wide operating

current (100mA) and temperature range (0

°C to 105°C) makes it suitable for all variety of applications that are looking for a low cost

solution with high performance. SPX3431 tolerance of 0.5% is proven to be sufficient to overcome all the other errors in the

system to virtually eliminate the need for trimming in the power supply manufactures assembly line and contribute a big Cost

Savings.

In the standard shunt configuration, the combination of low temperature coefficient (T.C.), sharp turn-on characteristics, low output

impedance and programmable output voltage make this precision reference an excellent error amplifier.

The SPX3431 is a direct replacement for the SPX431 and TL431 in low voltage, low current applications. SPX3431 is also available

in SOT-89 and TO-92.

SOT-89

Marking &

pinout for all

devices

SOT-23

Marking & pinout for

the 0.5% device

SOT-23

Marking & pinout for

the 1% device

Top View

REF

CATHODE

ANODE

Top View

REF

CATHODE

ANODE

Top View

SPX3431

1

CATHODE

2

ANODE

3

REF

REF

Top View

13

2

CATHODE

ANODE

TO-92 (N)

SPX3431

SPX3432

PIN CONNECTIONS