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Date: 1/19/05

SPX431A,B,C Precision Adjustable Shunt Regulator

© Copyright 2005 Sipex Corporation

Precision Adjustable Shunt Regulator

The SPX431 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate

bandgap reference. The SPX431 acts as an open-loop error amplifier with a 2.5V temperature

compensation reference. The SPX431's thermal stability, wide operating current (150mA) and

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

cost, high performance solution. SPX431A 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.

The output voltage may be adjusted to any value between V

resistors. The SPX431 is available in TO-92, SOIC-8, SOT-89, and SOT-23-5 packages.

SPX431A,B,C

®

FEATURES

■ Trimmed Bandgap to 0.5%, 1% and 2%

■ Wide Operating Current 1mA to 150mA

■ Extended Temperature Range:

0°C to 105°C

■ Low Temperature Coefficient 30 ppm/°C

■ Offered in TO-92, SOIC, SOT-89,

SOT-23-5

■ Improved Replacement in Performance for

TL431

■ Low Cost Solution

APPLICATIONS

■ Battery Operating Equipment

■ Adjustable Supplies

■ Switching Power Supplies

■ Error Amplifiers

■ Single Supply Amplifier

■ Monitors / VCRs / TVs

■ Personal Computers

DESCRIPTION

Anode (A)

Cathode (K)

2.5V

Reference

(R)

+

-

Refer to page 3 for pinouts.

TYPICAL APPLICATIONS CIRCUIT

Now Available in Lead Free Packaging