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SPX431L

Precision Adjustable Shunt Regulator

Signal Processing Technologies 

®

SPX431L

Precision Adjustable Shunt Regulator

FEATURES

■ Tight Voltage Tolerance 0.5% at 10mA

■ Wide Operating Current 1mA to 100mA

■ Extended Temperature Range:

0°C to 105°C

■ Low Temperature Coefficient 30 ppm/°C

■ Improved Replacement in Performance for

TL431 and AS431

■ Low Cost Solution

ANODE

SPX431L

3 Pin SOT-23

1

REF

CATHODE

Now Available in Lead Free Packaging

APPLICATIONS

■ Battery Operating Equipment

■ Adjustable Supplies

■ Switching Power Supplies

■ Error Amplifiers

■ Single Supply Amplifier

■ Monitors / VCRs / TVs

■ Personal Computers

DESCRIPTION

The SPX431L is a 3-terminal adjustable shunt voltage regulator providing a highly accurate

bandgap reference. The SPX431L acts as an open-loop error amplifier with a 2.5V temperature

compensation reference. The SPX431L’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. SPX431L 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 VREF and 20V with two external

resistors. The SPX431L is available in TO-92, SOIC-8, SOT-89, and SOT-23-3 packages.

BLOCK DIAGRAM

Cathode (K)

Reference

(R)

Date: 5/25/04

+

-

2.5V

Anode (A)

SPX431L Precision Adjustable Shunt Regulator

1

© Copyright 2004 Sipex Corporation5

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