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TS4431| Datasheet

By datasheet - April 3rd, 2008

TS4431, TS4431AILT, TS4431ILT

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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: 250uA Industrial temperature range: -40 to +85 C 100ppm/ C temperature coefficient Pin connections (top view) SOT23-5L (Plastic Micropackage)

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.

1 Vc c 2 Gnd 3 Nc

Sink

5

Ref

4

Applications

Low voltage switch mode power supplies Isolated DC/DC converter Computers Low voltage discrete regulator

Order Codes
Part Number TS4431AILT TS4431ILT Accuracy 0.5% -40, +85 C 1% SOT23-5 Tape & Reel L275 Temperature Range Package Packing Marking L288

November 2005

Rev 2 1/8
www.st.com
8


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