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Date: 12/11/04

SPX432 1.24V Precision Adjustable Shunt Regulator

© Copyright 2004 Sipex Corporation

1.24V Precision Adjustable Shunt Regulator

SPX432

DESCRIPTION

FEATURES

■ Low Voltage Operation, 1.24V

■ Trimmed Bandgap to 0.5% and 1%

■ Wide Operating Current, 1mA to 80mA

■ Adjustable Output Voltage, V

■ Extended Temp.Range: 0°C to 105°C

■ Low Temperature Coefficient, 50 ppm/°C

■ Offered in TO-92, SOIC, SOT-23-3

■ Replacement for TLV431, AS432

®

The SPX432 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate 1.24V

bandgap reference with 0.5% tolerance. The SPX432’s thermal stability, wide operating current

(80mA) and temperature range (0

°C to 105°C) makes it suitable for a variety of applications. SPX432

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 manufactures’ assembly lines and contribute a

significant cost savings.

The SPX432 is an ideal voltage reference in an isolated feedback circuit for switch mode power

supplies. SPX432 offers many advantages over the TLV431 such as wider output voltage (18V vs.

6V), higher output current (80mA vs. 15mA) and a wider operating temperature range with a tighter

tolerance down to 0.5%.

■ Single Supply Amplifier

■ Monitors / VCRs / TVs

■ Personal Computers

■ Voltage References

BLOCK DIAGRAM

Cathode (K)

1.24V

Reference

(R)

+

-

Anode (A)

Now Available in Lead Free Packaging

APPLICATIONS

■ Switching Power Supplies

■ Adjustable Supplies

■ Error Amplifiers

Refer to page 11 for other pinouts.

SPX432

3 Pin SOT-23

Ref

Anode

Cathode

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2

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