1 Features
- Average Temperature Coefficient 50 ppm/°C
- Temperature Compensated for Operation Over the Full Temperature Range
- Programmable Output Voltage
- Fast Turnon Response
- Low-Output Noise
- Low-Dynamic Output Impedance
- Available in Space-Saving SOIC-8, SOT-23, and TO-92 Packages
2 Applications
- Adjustable Voltage or Current Linear and Switching Power Supplies
- Voltage Monitoring
- Current Source and Sink Circuits
- Circuits Requiring Precision References
- Zener Diode Replacements
3 Description
The LM431 is a 3-terminal adjustable shunt regulator with ensured temperature stability over the entire temperature range of operation. The output voltage may be set at any level greater than 2.5 V (VREF) up to 36 V merely by selecting two external resistors that act as a voltage pided network. Due to the sharp turnon characteristics this device is an excellent replacement for many Zener diode applications.
The LM431 is available in space-saving SOIC-8, SOT-23, and TO-92 packages.
Device Information
PART NUMBERPACKAGEBODY SIZE (NOM)
| LM431 | SOIC (8) | 4.90 mm × 3.91 mm |
| SOT-23 (3) | 2.92 mm × 1.30 mm |
| TO-92 (3) | 4.30 mm × 4.30 mm |
- For all available packages, see the orderable addendum at the end of the data sheet.
LM431 Symbol
Functional Block Diagram
