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Date: 1/19/05

SPX2431 Precision Adjustable Shunt Regulator

© Copyright 2005 Sipex Corporation

Precision Adjustable Shunt Regulator

SPX2431

DESCRIPTION

FEATURES

■ Trimmed Bandgap to 0.5% and 1.0%

■ Wide Operating Current 1mA to 100mA

■ Extended Temp. Range: 0°C to 105°C

■ Low Temperature Coefficient 30 ppm/°C

■ Offered in 3 Pin SOT-23 (M)

■ Replacement for TL431, AS2431

■ Low Noise Output

®

The SPX2431 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate

bandgap reference.The SPX2431 acts as an open-loop error amplifier with a 2.5V temperature

compensation reference.The SPX2431’s thermal stability, wide operating current (100mA) and

temperature range (0°C to 105°C) makes it suitable for a variety of applications that require a

low cost, high performance solution. SPX2431A tolerance of 0.5% is proven to be sufficient to

overcome all of the other errors in the system to virtually eliminate the need for trimming in the

power supply manufacturer's assembly line and contribute a significant cost savings.

resistors. In the standard shunt configuration, the combination of a low temperature coefficient,

sharp turn on characteristics, low output impedance, and programmable output voltage makes

this precision reference an excellent error amplifier. The SPX2431 is available in SOT-23-3

package.

APPLICATIONS

■ Battery Operating Equipment

■ Adjustable Supplies

■ Switching Power Supplies

FUNCTIONAL DIAGRAM

+

-

2.5V

Reference

(R)

Anode (A)

Cathode (K)

Now Available in Lead Free Packaging

■ Error Amplifiers

■ Single Supply Amplifier

■ Monitors / VCRs / TVs

■ Personal Computers

SPX2431

3 Pin SOT-23

1

2

3

Top View

CATHODE

REF

ANODE