®
SPX2431
Precision Adjustable Shunt Regulator
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
APPLICATIONS
■
Battery Operating Equipment
■
Adjustable Supplies
■
Switching Power Supplies
■
■
■
■
ANODE
3
SPX2431
3 Pin SOT-23
1
REF
Top View
2
CATHODE
Now Available in Lead Free Packaging
Error Amplifiers
Single Supply Amplifier
Monitors / VCRs / TVs
Personal Computers
DESCRIPTION
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.
The output voltage may be adjusted to any value between V
REF
and 20 volts with two external
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.
FUNCTIONAL DIAGRAM
Cathode (K)
Reference
(R)
+
-
2.5V
Anode (A)
Date: 1/19/05
SPX2431 Precision Adjustable Shunt Regulator
© Copyright 2005 Sipex Corporation
1
SIPEX [ SIPEX CORPORATION ]
