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Rev 2
8
November 2005 1/8
TS4431
1.224V Open Collector Shunt Voltage Reference
■ Internal 1.224V ±0.5% precision
■ Low output saturation voltage
75 mV max between SINK and GND
■ Low current consumption: 250µA
■ Industrial temperature range: -40 to +85°C
■ 100ppm/°C temperature coefficient
Description
The TS4431 is a four-terminal device dedicated to
low voltage Switch Mode Power Supplies (SMPS).
It integrates a 1.224V voltage reference, an
amplifier, and an open collector output transistor
in a single package. The TS4431’s operating
mode is similar to the well-known standard
voltage reference, the TL431. It maintains the
desired feedback voltage at the REF pin in a
closed loop configuration by sinking a current
proportional to the error voltage at the REF pin.
TS4431 features an open collector transistor with
an ultra-low saturation voltage, allowing it to be
used in series with the optocoupler in an SMPS
architecture to regulate low voltage SMPS.
Applications
■ Low voltage switch mode power supplies
■ Isolated DC/DC converter
■ Computers
■ Low voltage discrete regulator
Order Codes
SOT23-5L
(Plastic Micropackage)
Pin connections (top view)
1
2
34
5
Vc c
Gnd
Nc Ref
Sink
Part Number Accuracy Temperature Range Package Packing Marking
TS4431AILT 0.5%
-40, +85°C SOT23-5 Tape & Reel
L288
TS4431ILT 1% L275
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